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Many of these thoughts are likely forgotten, the authors say, probably because there is only so much a person can focus on in the sea of perceptions and stimuli going on around us. If the intuition is valuable enough to the self, the brain will assist future recall of the intuition

They also fit well with the idea that the greater accessibility of planning thoughts in memory results from an evolutionary process whereby mental contents that enhance survival chances are better remembered.

Consumers who purchased the recalled product should throw it away or return it to the place of purchase, the Food Safety and Inspection Service said.

I learned something more useful: the existence of non-fiction literature that can teach you anything.

something felt odd. Whenever a conversation revolved around a serious non-fiction book I read, such as ‘Sapiens’ or ‘Thinking Fast and Slow,’ I could never remember much. Turns out, I hadn’t absorbed as much information as I’d believed. Since I couldn’t remember much, I felt as though reading wasn’t an investment in knowledge but mere entertainment.

When I opened up about my struggles, many others confessed they also can’t remember most of what they read, as if forgetting is a character flaw. But it isn’t.

It’s the way we work with books that’s flawed.

there’s a better way to read. Most people rely on techniques like highlighting, rereading, or, worst of all, completely passive reading, which are highly ineffective.

Since I started applying evidence-based learning strategies to reading non-fiction books, many things have changed. I can explain complex ideas during dinner conversations. I can recall interesting concepts and link them in my writing or podcasts. As a result, people come to me for all kinds of advice.

What’s the Architecture of Human Learning and Memory?

Human brains don’t work like recording devices. We don’t absorb information and knowledge by reading sentences.

we store new information in terms of its meaning to our existing memory

we give new information meaning by actively participating in the learning process — we interpret, connect, interrelate, or elaborate

To remember new information, we not only need to know it but also to know how it relates to what we already know.

Learning is dependent on memory processes because previously-stored knowledge functions as a framework in which newly learned information can be linked.”

Human memory works in three stages: acquisition, retention, and retrieval. In the acquisition phase, we link new information to existing knowledge; in the retention phase, we store it, and in the retrieval phase, we get information out of our memory.

Retrieval, the third stage, is cue dependent. This means the more mental links you’re generating during stage one, the acquisition phase, the easier you can access and use your knowledge.

we need to understand that the three phases interrelate

creating durable and flexible access to to-be-learned information is partly a matter of achieving a meaningful encoding of that information and partly a matter of exercising the retrieval process.”

Next, we’ll look at the learning strategies that work best for our brains (elaboration, retrieval, spaced repetition, interleaving, self-testing) and see how we can apply those insights to reading non-fiction books.

The strategies that follow are rooted in research from professors of Psychological & Brain Science around Henry Roediger and Mark McDaniel. Both scientists spent ten years bridging the gap between cognitive psychology and education fields. Harvard University Press published their findings in the book ‘Make It Stick.

#1 Elaboration

“Elaboration is the process of giving new material meaning by expressing it in your own words and connecting it with what you already know.”

Why elaboration works: Elaborative rehearsal encodes information into your long-term memory more effectively. The more details and the stronger you connect new knowledge to what you already know, the better because you’ll be generating more cues. And the more cues they have, the easier you can retrieve your knowledge.

How I apply elaboration: Whenever I read an interesting section, I pause and ask myself about the real-life connection and potential application. The process is invisible, and my inner monologues sound like: “This idea reminds me of…, This insight conflicts with…, I don’t really understand how…, ” etc.

For example, when I learned about A/B testing in ‘The Lean Startup,’ I thought about applying this method to my startup. I added a note on the site stating we should try it in user testing next Wednesday. Thereby the book had an immediate application benefit to my life, and I will always remember how the methodology works.

How you can apply elaboration: Elaborate while you read by asking yourself meta-learning questions like “How does this relate to my life? In which situation will I make use of this knowledge? How does it relate to other insights I have on the topic?”

While pausing and asking yourself these questions, you’re generating important memory cues. If you take some notes, don’t transcribe the author’s words but try to summarize, synthesize, and analyze.

#2 Retrieval

With retrieval, you try to recall something you’ve learned in the past from your memory. While retrieval practice can take many forms — take a test, write an essay, do a multiple-choice test, practice with flashcards

the authors of ‘Make It Stick’ state: “While any kind of retrieval practice generally benefits learning, the implication seems to be that where more cognitive effort is required for retrieval, greater retention results.”

Whatever you settle for, be careful not to copy/paste the words from the author. If you don’t do the brain work yourself, you’ll skip the learning benefits of retrieval

Retrieval strengthens your memory and interrupts forgetting and, as other researchers replicate, as a learning event, the act of retrieving information is considerably more potent than is an additional study opportunity, particularly in terms of facilitating long-term recall.

How I apply retrieval: I retrieve a book’s content from my memory by writing a book summary for every book I want to remember. I ask myself questions like: “How would you summarize the book in three sentences? Which concepts do you want to keep in mind or apply? How does the book relate to what you already know?”

I then publish my summaries on Goodreads or write an article about my favorite insights

How you can apply retrieval: You can come up with your own questions or use mine. If you don’t want to publish your summaries in public, you can write a summary into your journal, start a book club, create a private blog, or initiate a WhatsApp group for sharing book summaries.

a few days after we learn something, forgetting sets in

#3 Spaced Repetition

With spaced repetition, you repeat the same piece of information across increasing intervals.

The harder it feels to recall the information, the stronger the learning effect. “Spaced practice, which allows some forgetting to occur between sessions, strengthens both the learning and the cues and routes for fast retrieval,”

Why it works: It might sound counterintuitive, but forgetting is essential for learning. Spacing out practice might feel less productive than rereading a text because you’ll realize what you forgot. Your brain has to work harder to retrieve your knowledge, which is a good indicator of effective learning.

How I apply spaced repetition: After some weeks, I revisit a book and look at the summary questions (see #2). I try to come up with my answer before I look up my actual summary. I can often only remember a fraction of what I wrote and have to look at the rest.

“Knowledge trapped in books neatly stacked is meaningless and powerless until applied for the betterment of life.”

How you can apply spaced repetition: You can revisit your book summary medium of choice and test yourself on what you remember. What were your action points from the book? Have you applied them? If not, what hindered you?

By testing yourself in varying intervals on your book summaries, you’ll strengthen both learning and cues for fast retrieval.

Why interleaving works: Alternate working on different problems feels more difficult as it, again, facilitates forgetting.

How I apply interleaving: I read different books at the same time.

1) Highlight everything you want to remember

#5 Self-Testing

While reading often falsely tricks us into perceived mastery, testing shows us whether we truly mastered the subject at hand. Self-testing helps you identify knowledge gaps and brings weak areas to the light

“It’s better to solve a problem than to memorize a solution.”

Why it works: Self-testing helps you overcome the illusion of knowledge. “One of the best habits a learner can instill in herself is regular self-quizzing to recalibrate her understanding of what she does and does not know.”

How I apply self-testing: I explain the key lessons from non-fiction books I want to remember to others. Thereby, I test whether I really got the concept. Often, I didn’t

instead of feeling frustrated, cognitive science made me realize that identifying knowledge gaps are a desirable and necessary effect for long-term remembering.

How you can apply self-testing: Teaching your lessons learned from a non-fiction book is a great way to test yourself. Before you explain a topic to somebody, you have to combine several mental tasks: filter relevant information, organize this information, and articulate it using your own vocabulary.

Now that I discovered how to use my Kindle as a learning device, I wouldn’t trade it for a paper book anymore. Here are the four steps it takes to enrich your e-reading experience

How you can apply interleaving: Your brain can handle reading different books simultaneously, and it’s effective to do so. You can start a new book before you finish the one you’re reading. Starting again into a topic you partly forgot feels difficult first, but as you know by now, that’s the effect you want to achieve.

it won’t surprise you that researchers proved highlighting to be ineffective. It’s passive and doesn’t create memory cues.

2) Cut down your highlights in your browser

After you finished reading the book, you want to reduce your highlights to the essential part. Visit your Kindle Notes page to find a list of all your highlights. Using your desktop browser is faster and more convenient than editing your highlights on your e-reading device.

Now, browse through your highlights, delete what you no longer need, and add notes to the ones you really like. By adding notes to the highlights, you’ll connect the new information to your existing knowledge

3) Use software to practice spaced repetitionThis part is the main reason for e-books beating printed books. While you can do all of the above with a little extra time on your physical books, there’s no way to systemize your repetition praxis.

Readwise is the best software to combine spaced repetition with your e-books. It’s an online service that connects to your Kindle account and imports all your Kindle highlights. Then, it creates flashcards of your highlights and allows you to export your highlights to your favorite note-taking app.

Common Learning Myths DebunkedWhile reading and studying evidence-based learning techniques I also came across some things I wrongly believed to be true.

#2 Effective learning should feel easyWe think learning works best when it feels productive. That’s why we continue to use ineffective techniques like rereading or highlighting. But learning works best when it feels hard, or as the authors of ‘Make It Stick’ write: “Learning that’s easy is like writing in sand, here today and gone tomorrow.”

In Conclusion

I developed and adjusted these strategies over two years, and they’re still a work in progress.

Try all of them but don’t force yourself through anything that doesn’t feel right for you. I encourage you to do your own research, add further techniques, and skip what doesn’t serve you

“In the case of good books, the point is not to see how many of them you can get through, but rather how many can get through to you.”— Mortimer J. Adler

If Mr. Trump talks about Muslim parents and their son who was killed in action, that’s what the public remembers. If he goes to Mexico or Louisiana, that’s what they recall reading or hearing about him. If Mr. Trump calls President Obama the founder of the Islamic State, “ISIS” moves to the top of the list of what Americans tell us they are hearing about the Republican candidate.

it may not matter exactly why Americans are so likely to recall reading about Mrs. Clinton’s email situation week after week. Its looming prominence in the public’s mind has become a reality, and it has the effect of superseding public awareness of her policy speeches and statements about issues.

What Americans recall hearing about Mrs. Clinton is significantly less varied. Specifically — and to an extraordinary degree — Americans have consistently told us that they are reading and hearing about her handling of emails

By contrast, it’s clear that Mrs. Clinton and her campaign team have not wanted her handling of emails to dominate what Americans have been taking away from her campaign over the past two months

we can assume he wants his statements and actions to be seen and heard, to attract attention. The evidence is clear that they are. The public may be getting no more than a superficial understanding of Mr. Trump’s positions on key issues or how he would implement them as laws if he is elected, but the public clearly is repeating back to us what he intends for it to hear.

the public may be learning about the candidates’ temperament, character, personality and health issues, but from what they tell us, Americans aren’t getting much in the way of real substance.

The moderators of the coming series of debates will most likely focus directly on the candidates’ positions on issues. This may shift what Americans tell us they are learning about the candidates, and if so, it could signal a significant upgrade in the way the process is working. But that also means that a lot still depends on the candidates themselves and how they end up shaping the contours of the debates

In short, learning what did happen impedes you from retrieving what you thought would happen.

In 2002, psychologists asked nearly 1,000 Americans to recall how likely they had expected terrorism-related incidents—and other risky events—to be in the immediate aftermath of Sept. 11, 2001. After a year in which fears had mostly subsided, they remembered being much less pessimistic than they had been at the time.

“We’re biased to see ourselves in a positive light,” says Deborah Small, a psychologist at the Wharton School at the University of Pennsylvania. “We want to believe that we’re rational and smart. We’ll recall our past actions as more sensible than they were. We also give ourselves too much credit and don’t remember our mistakes as well as we do our successes.”

take what psychologist Daniel Kahneman calls “the outside view.” Rather than try to figure out exactly how bad this crisis will be, look at the broader set of historical precedents.

Since 1929, the S&P 500 has suffered 14 bear markets, defined by S&P Dow Jones Indices as losses of at least 20%. The shortest and shallowest was the 20% drop that lasted less than three months in late 1990. The deepest was the 86.2% collapse from September 1929 to June 1932; the longest, the 60% plunge from March 1937 to April 1942. On average, bear markets lasted 19 months and dealt a 39% loss.

But when our own memories are challenged, we may neglect all this and instead respond emotionally, acting as though we must be right and everyone else must be wrong

This fall the panel (which one of us, Daniel Simons, served on) released a comprehensive report that recommended procedures to minimize the chances of false memory and mistaken identification, including videotaping police lineups and improving jury instructions.

In general, if you have seen something before, your confidence that you have seen it and your accuracy in recalling it are linked: The more confident you are in your memory, the more likely you are to be right. But new research reveals important nuances about this link.

But when people mistakenly recalled words that were similar to those on the lists but not actually on the lists — a false memory — they also expressed high confidence.

When we recall our own memories, we are not extracting a perfect record of our experiences and playing it back verbatim. Most people believe that memory works this way, but it doesn’t. Instead, we are effectively whispering a message from our past to our present, reconstructing it on the fly each time.

In Dr. Tyson’s case, once the evidence of his error was undeniable, he didn’t dig his hole deeper or wish the controversy away. He realized that his memory had conflated his experiences of two memorable and personally significant events that both involved speeches by Mr. Bush. He probably still remembers it the way he described it in his talks — but to his credit, he recognizes that the evidence outweighs his experience, and he has publicly apologized.

Good scientists remain open to the possibility that they are wrong, and should question their own beliefs until the evidence is overwhelming. We would all be wise to do the same.

Politicians should respond as Dr. Tyson eventually did: Stop stonewalling, admit error, note that such things happen, apologize and move on

At every age we think we’re having the last laugh, and at every age we’re wrong.”

the discrepancy did not seem to be because of faulty memories, because the personality changes recalled by people jibed quite well with independent research charting how personality traits shift with age. People seemed to be much better at recalling their former selves than at imagining how much they would change in the future.

a few theories, starting with the well-documented tendency of people to overestimate their own wonderfulness. “Believing that we just reached the peak of our personal evolution makes us feel good,”

Or maybe the explanation has more to do with mental energy: predicting the future requires more work than simply recalling the past. “People may confuse the difficulty of imagining personal change with the unlikelihood of change itself,”

“The end-of-history effect may represent a failure in personal imagination,” said Dan P. McAdams, a psychologist at Northwestern who has done separate research into the stories people construct about their past and future lives. He has often heard people tell complex, dynamic stories about the past but then make vague, prosaic projections of a future in which things stay pretty much the same.

subjects read several sentences. When he tested them 40 minutes later, they could generally remember the sentences word for word. Four days later, though, they were useless at recalling the specific phrasing of the sentences—but still very good at describing the meaning of them.

When you’re an expert in a subject, you can retain new factoids on your favorite topic easily. This only works for the subjects you’re truly passionate about, though

The groups that scored highest on a test of their transactive memory—in other words, the groups where members most relied on each other to recall information—performed better than those who didn't use transactive memory. Transactive groups don’t just remember better: They also analyze problems more deeply, too, developing a better grasp of underlying principles.

Wegner noticed that spouses often divide up memory tasks. The husband knows the in-laws' birthdays and where the spare light bulbs are kept; the wife knows the bank account numbers and how to program the TiVo

Together, they know a lot. Separately, less so.

Wegner suspected this division of labor takes place because we have pretty good "metamemory." We're aware of our mental strengths and limits, and we're good at intuiting the memory abilities of others.

We share the work of remembering, Wegner argued, because it makes us collectively smarter

They were, in a sense, Googling each other.

Transactive memory works best when you have a sense of how your partners' minds work—where they're strong, where they're weak, where their biases lie. I can judge that for people close to me. But it's harder with digital tools, particularly search engines

So humanity has always relied on coping devices to handle the details for us. We’ve long stored knowledge in books, paper, Post-it notes

And as it turns out, this is what we’re doing with Google and Evernote and our other digital tools. We’re treating them like crazily memorious friends who are usually ready at hand. Our “intimate dyad” now includes a silicon brain.

When Sparrow tested the students, the people who knew the computer had saved the information were less likely to personally recall the info than the ones who were told the trivia wouldn't be saved. In other words, if we know a digital tool is going to remember a fact, we're slightly less likely to remember it ourselves

believing that one won't have access to the information in the future enhances memory for the information itself, whereas believing the information was saved externally enhances memory for the fact that the information could be accessed.

Just as we learn through transactive memory who knows what in our families and offices, we are learning what the computer 'knows' and when we should attend to where we have stored information in our computer-based memories,

We’ve stored a huge chunk of what we “know” in people around us for eons. But we rarely recognize this because, well, we prefer our false self-image as isolated, Cartesian brains

We’re dumber and less cognitively nimble if we're not around other people—and, now, other machines.

When humans spew information at us unbidden, it's boorish. When machines do it, it’s enticing.

Though you might assume search engines are mostly used to answer questions, some research has found that up to 40 percent of all queries are acts of remembering. We're trying to refresh the details of something we've previously encountered.

"the thinking processes of the intimate dyad."

We need to develop literacy in these tools the way we teach kids how to spell and write; we need to be skeptical about search firms’ claims of being “impartial” referees of information

And on an individual level, it’s still important to slowly study and deeply retain things, not least because creative thought—those breakthrough ahas—come from deep and often unconscious rumination, your brain mulling over the stuff it has onboard.

you can stop worrying about your iPhone moving your memory outside your head. It moved out a long time ago—yet it’s still all around you.

Between Aug. 1 and the Super Bowl in early February, the N.F.L. administered almost one million tests to players and staff.

Many other organizations have sought safety in mass testing.

When the coronavirus closed down the country last spring, many colleges and universities sought her advice on how to safely reopen.

Now, a new analysis suggests that schools, businesses and other organizations that want to keep themselves safe should think beyond strictly themselves.

By dedicating a substantial proportion of their tests to people in the surrounding community, institutions could reduce the number of Covid-19 cases among their members by as much as 25 percent, researchers report in a new paper, which has not yet been published in a scientific journal.

“It’s natural in an outbreak for people to become self-serving, self-focused,”

“If you’ve been in enough outbreaks you just understand that testing in a box doesn’t makes sense. These things are communicable, and they’re coming in from the community.”

“really profound implications, especially if others can replicate it,” said David O’Connor

“We want to start using more sophisticated modeling and probably economic theory to inform what an optimal testing program would look like.”

Dr. Sabeti is an epidemic veteran, part of teams that responded to an Ebola outbreak in West Africa in 2014 and a mumps outbreak in the Boston area a few years later.

The University of Illinois is testing its students, faculty and staff twice a week and has conducted more than 1.6 million tests since July.

At a time when testing resources were in short supply, many of these institutions were proposing intensive, expensive testing regimens focused entirely on their own members

‘You’re in a drought in a place with a lot of forest fires, and you have a shortage of fire alarms,’” she recalled. “‘And if you run out and buy every fire alarm and install it in your own house, you’ll be able to pick up a fire the moment it hits your house, but at that point it’s burning to the ground.’”

‘You’re in a drought in a place with a lot of forest fires, and you have a shortage of fire alarms,’” she recalled. “‘And if you run out and buy every fire alarm and install it in your own house, you’ll be able to pick up a fire the moment it hits your house, but at that point it’s burning to the ground.’”

Using real-world data from C.M.U., the researchers created a baseline scenario in which 1 percent of people at the school, and 6 percent of those in the surrounding county, were infected by the coronavirus, and the university was testing 12 percent of its members every day.

Under these conditions, the researchers found, if the university used all of its tests on its own members, it would have roughly 200 Covid-19 cases after 40 days

The researchers then tweaked the model’s parameters in various ways: What if the virus were more prevalent? What if students and staff did not report all their contacts? What if they were better about mask-wearing and social distancing? What if the university deployed more tests, or fewer?

Unsurprisingly, the more testing the university did, and the more information it had about its members’ close contacts, the fewer Covid-19 cases there were

But in virtually every scenario, sharing at least some tests with the broader community led to fewer cases than hoarding them.

Some universities are beginning to adopt this outlook.

“A virus does not respect geographic boundaries,” Dr. Pollock said. “It is ludicrous to think that you can get control of an acute infectious respiratory disease like Covid-19, in a city like Davis that hosts a very large university, without coordinated public health measures that connect both the university and the community.”

There are barriers to the more altruistic approach, including internal political pressure to use testing resources in house and concerns about legal liability.

the researchers hope that their model convinces at least some institutions to rethink their strategy, not only during this epidemic but also in future ones.

“An outbreak is an opportunity to buy a lot of community good will, or to burn a lot of community good will,” Dr. Sabeti said. “We could have spent an entire year building up that relationship between organizations and institutions and their communities. And we would have done all that hard work together, as opposed to everybody turning inward.”

Sarah Everard in London. Soon Chung Park, Hyun Jung Grant, Suncha Kim, Yong Ae Yue, Delaina Ashley Yaun, Xiaojie Tan and Daoyou Feng in Atlanta.

Eight women, two continents apart, killed in the space of two weeks. The suspects in both cases are men.

London, Ms. Everard disappeared while walking home from a friend’s house, and was found dead a week later. A police officer was charged with kidnapping and murdering her.

In Atlanta, a gunman stormed three massage parlors and shot and killed eight people — seven of them women, six of them Asian — raising speculation that the attack was racially motivated

In the days after Ms. Everard’s body was found and protests calling for deeper social change grew across the United Kingdom

the British government announced an experimental pilot program (though there is no fixed start date yet) that would categorize cases of gender-based violence and harassment motivated by misogyny as hate crimes.

“Across the country, women everywhere are looking to us not just to express sympathy with their concerns, but to act,”

“Stop telling them to stay at home and be careful, and start finding those responsible for the violence.”

In Atlanta, the arrested suspect told the police he had a “sexual addiction,” according to the Cherokee County Sheriff’s Office, prompting some activists to call for him to be charged with a hate crime there, too.

“What can’t be forgotten is the hate crime statute says ‘because of gender’ as well,”

“The angle of misogyny has to be looked at.”

Do ‘sweat the small stuff’

As women around the world watched the two events unfold, they started sharing their own stories on social media of having been in similar situations that had the potential to escalate and turn similarly violent.

Women spoke of all of the things that they — like Ms. Everard — did “right,” including walking on well-lit streets, and talking on the phone or clutching their keys in their pockets while doing so — and described how they still ended up in dangerous situations.

Asian women spoke of all of the ways in which sexism and racism coalesce to expose them to a unique form of harassment that can lead to violence and abuse.

Their stories confirm that violence against women isn’t an aberration, but a “global public health” crisis of “epidemic proportions,”

In the United States, one online survey in 2018 found that 81 percent of women had experienced some kind of sexual harassment during their lifetimes. In the United Kingdom, 97 percent of women aged 18 to 24 said they had been sexually harassed, according to UN Women UK.

These numbers are all from before the coronavirus pandemic; with the onset of the health crisis, domestic abuse surged and public spaces became eerily empty, leaving women feeling increasingly worried about their safety.

Violence against women is consistently underreported because women are scared of retaliation for speaking out or they fear the stigma associated with sexual violence,

UN Women’s initiative to end gender-based violence.

“We’re not joining the dots, nobody is making connections,

“There is a big picture here that we are just repeatedly missing. There are connections between the normalized daily behaviors that we brush off and the more serious abuses.”

a woman recalls that when she was in school, at age 13 or 14, a few girls complained to a teacher that the boys in their class had been groping them and the teacher said that they were “being oversensitive.

In another example, a woman recalls waiting at a bus stop when a man walked up to her and grabbed her bottom but everyone around her who had witnessed the incident remained silent.

a woman recalls how a man sat directly opposite her on the train and touched himself and then got off the train on the next stop, as if nothing had happened.

There is plenty of evidence to suggest that misogyny and gender-based violence are also correlated with broader threats

a spike in gender-based violence — particularly domestic violence — correlates with “rising levels of insecurity in society more broadly.”

A sudden disappearance of girls from schools, for example, could point to a rise of fundamentalist views

“If only we were to listen to women and pay attention to the misogyny and aggression and violence that they deal with on a daily basis.”

As pervasive as sexism, misogyny and gender-based violence are, none are inevitable and they can be countered

“The term ‘violence against women’ is a passive construction — there’s no active agent, it’s a bad thing that happens to women,” he explained, but it’s as if “nobody’s doing it to them.”

“shifts the accountability off of men and the culture that produces them and puts it onto women.”

The second step is recognizing that male aggression against women is a manifestation of a broader systemic problem. “There’s this impulse to pathologize the individual perpetrators — that somehow the individual perpetrator is some monster who just kind of crawled out of the swamp,

“But if you accept the concept that it’s systemic, then there are policy implications and political implications and introspection that can be uncomfortable.

“And how that message plays in the community, how you talk about it, how you have police understand it.”

“Making misogyny a crime is like making racism a crime — it’s unfortunate, it’s ugly and we wish people wouldn’t do it, but you can’t punish somebody for saying something,” he said.

In other words, they’d have to show that the man assaulted her because she’s a woman, which is a tough standard to meet.

In the United States, a crime motivated by gender bias is considered a hate crime at the federal level and in 35 states.

Reporting hate crimes also requires a police force that is trained to appropriately respond to those complaints.

But that would only broaden the powers of law enforcement, which several women’s rights groups argue wouldn’t do much to prompt deeper cultural change.

. Many still felt, according to the survey, that incidents like name calling or groping seemed too normal for the police to take seriously.

“So what’s the point of me going to the police station and sitting there for two hours with a policeman who probably just thinks, ‘Why are you wasting my time?’”

forgetting seems to be an active mechanism that is constantly at work in the brain.

“To have proper memory function, you have to have forgetting.

Different types of memory are created and stored in varying ways, and in various areas of the brain.

Neurons communicate with each other through synapses — junctions between these cells that include a tiny gap across which chemical messengers can be sent

The more often a memory is recalled, the stronger its neural network becomes. Over time, and through consistent recall, the memory becomes encoded in both the hippocampus and the cortex

Because the hippocampus is not where long-term memories are stored in the brain, its dynamic nature is not a flaw but a feature

Neuroscientists often refer to this physical representation of a memory as an engram. They think that each engram has a number of synaptic connections, sometimes even in several areas of the brain, and that each neuron and synapse can be involved in multiple engrams

The brain is always trying to forget the information it’s already learnt,

Hardt’s lab showed that a dedicated mechanism continuously promotes the expression of AMPA receptors at synapses.

To forget certain things, it seemed that the rat brain had to proactively destroy connections at the synapse. Forgetting, Hardt says, “is not a failure of memory, but a function of it”.

Paul Frankland, a neuroscientist at the Hospital for Sick Children in Toronto, Canada, had also found evidence that the brain is wired to forget

Frankland was studying the production of new neurons, or neurogenesis, in adult mice. The process had long been known to occur in the brains of young animals, but had been discovered in the hippocampi of mature animals only about 20 years earlier. Because the hippocampus is involved in memory formation, Frankland and his team wondered whether increasing neurogenesis in adult mice could help the rodents to remember.

Eventually, it exists independently in the cortex, where it is put away for long-term storage.

Researchers think that the human brain might operate in a similar way

Studies of people with exceptional autobiographical memories or with impaired ones seem to bear this out

People with a condition known as highly superior autobiographical memory (HSAM) remember their lives in such incredible detail that they can describe the outfit that they were wearing on any particular day

Those with severely deficient autobiographical memory (SDAM), however, are unable to vividly recall specific events in their lives

As a result, they also have trouble imagining what might happen in the future

By better understanding how we forget, through the lenses of both biology and cognitive psychology, Anderson and other researchers might be edging nearer to improving treatments for anxiety, PTSD and even Alzheimer’s disease

Hardt thinks that Alzheimer’s disease might also be better understood as a malfunction of forgetting rather than remembering

But more memory researchers are shifting their focus to examine how the brain forgets, as well as how it remembers

In the past decade, researchers have begun to view forgetting as an important part of a whole

Why do we have memory at all? As humans, we entertain this fantasy that it’s important to have autobiographical details,

Forgetting enables us as individuals, and as a species, to move forwards.

“It’s a demonstration of this very cool idea that you have remnants of previous thoughts still rattling around in your head, and you bind the representation of what’s happening now to the fading embers of those old thoughts,

They watched a series of nouns appear on a computer screen, one after another, and after a brief distraction recalled as many of the words as they could, in any order. Repeated trials, with different lists of words, showed a predictable effect: The participants tended to remember the words in clusters, beginning with one and recalling those that were just before or after.

This pattern, which scientists call the contiguity effect, is similar to what often happens in the card game concentration, in which players try to identify pairs in a grid of cards lying face-down.

remembering a fact (a broken table) recalls a scene (dancing), which in turn brings to mind more facts — like the other people who were there — and so on.

“When you activate one memory, you are reactivating a little bit of what was happening around the time the memory was formed,” Dr. Kahana said, “and this process is what gives you that feeling of time travel.”

Two of the most important factors, Peterson explained, are whether the memory “has emotion infused in it,” and whether the memory is coherent: Does the story our memory tells us actually hang together and make sense when we recall it later?

A professor at the University of North Carolina-Chapel Hill, Reznick explained that shortly after birth, infants can start forming impressions of faces and react when they see those faces again; this is recognition memory. The ability to understand words and learn language relies on working memory, which kicks in at around six months old. More sophisticated forms of memory develop in the child’s second year, as semantic memory allows children to retain understanding of concepts and general knowledge about the world.

I formed earlier memories using more rudimentary, pre-verbal means, and that made those memories unreachable as the acquisition of language reshaped how my mind works, as it does for everyone.

False memories do exist, but their construction appears to begin much later in life

A study by Peterson presented young children with fictitious events to see if they could be misled into remembering these non-existent events, yet the children almost universally avoided the bait. As for why older children and adults begin to fill in gaps in their memories with invented details, she pointed out that memory is a fundamentally constructive activity: We use it to build understanding of the world, and that sometimes requires more complete narratives than our memories can recall by themselves.

as people get older, it becomes easier to conflate actual memories with other stimuli.

He explained that recognition memory is our most pervasive system, and that associations with my hometown I formed as an infant could well have endured more than 20 years later, however vaguely.

give me enough time, and I’m sure that detail will be added to my memory. It’s just too perfect a story.

two and a half years later, the questionnaire was given a second time to the same students.

It was then that R. T. recalled, with absolute confidence, her dorm-room experience.

She didn’t know any details of what had happened,

We don’t really remember an uneventful day the way that we remember a fight or a first kiss.

Her hope is to understand how, exactly, emotional memories behave at all stages of the remembering process: how we encode them, how we consolidate and store them, how we retrieve them.

When it comes to the central details of the event, like that the Challenger exploded, they are clearer and more accurate. But when it comes to peripheral details, they are worse. And our confidence in them, while almost always strong, is often misplaced.

Within the brain, memories are formed and consolidated largely due to the help of a small seahorse-like structure called the hippocampus; damage the hippocampus, and you damage the ability to form lasting recollections.

A key element of emotional-memory formation is the direct line of communication between the amygdala and the visual cortex.

Phelps has combined Neisser’s experiential approach with the neuroscience of emotional memory to explore how such memories work, and why they work the way they do.

Memory for the emotional scenes was significantly higher, and the vividness of the recollection was significantly greater.

hat is, if you were shocked when you saw animals, your memory of the earlier animals was also enhanced. And, more important, the effect only emerged after six or twenty-four hours: the memory needed time to consolidate.

o, if memory for events is strengthened at emotional times, why does everyone forget what they were doing when the Challenger exploded?

The strength of the central memory seems to make us confident of all of the details when we should only be confident of a few.

Our misplaced confidence in recalling dramatic events is troubling when we need to rely on a memory for something important—evidence in court, for instance

After reviewing the evidence, the committee made several concrete suggestions to changes in current procedures, including “blinded” eyewitness identification

standardized instructions to witnesses, along with extensive police training in vision and memory research as it relates to eyewitness testimony, videotaped identification, expert testimony early on in trials about the issues surrounding eyewitness reliability, and early and clear jury instruction on any prior identifications

“The strengthening of engram synapses is crucial for the brain’s ability to access or retrieve those specific memories,” Ryan said.

“past memories may not be erased, but could simply be lost and inaccessible for recall”.

Our lack of appreciation for the fallibility of our own memories can lead to much bigger problems than a misattributed quote.

Memory failures that resemble Dr. Tyson’s mash-up of distinct experiences have led to false convictions, and even death sentences. Whose memories we believe and whose we disbelieve influence how we interpret controversial public events, as demonstrated most recently by the events in Ferguson, Mo.

, for false memories, higher confidence was associated with lower accuracy.

In general, if you have seen something before, your confidence that you have seen it and your accuracy in recalling it are linked: The more confident you are in your memory, the more likely you are to be right

. This fall the panel (which one of us, Daniel Simons, served on) released a comprehensive report that recommended procedures to minimize the chances of false memory and mistaken identification, including videotaping police lineups and improving jury instructions.

When we recall our own memories, we are not extracting a perfect record of our experiences and playing it back verbatim. Most people believe that memory works this way, but it doesn’t. Instead, we are effectively whispering a message from our past to our present, reconstructing it on the fly each time. We get a lot of details right, but when our memories change, we only “hear” the most recent version of the message, and we may assume that what we believe now is what we always believed.

Studies find that even our “flashbulb memories” of emotionally charged events can be distorted and inaccurate, but we cling to them with the greatest of confidence.

With each retrieval our memories can morph, and so can our confidence in them. This is why the National Academy of Sciences report strongly advised courts to rely on initial statements rather than courtroom proclamations:

In fact, the mere act of describing a person’s appearance can change how likely you are to pick him out of a lineup later. This finding, known as “verbal overshadowing,” had been controversial, but was recently verified in a collective effort by more than 30 separate research labs.

The science of memory distortion has become rigorous and reliable enough to help guide public policy. It should also guide our personal attitudes and actions.

It is just as misguided to conclude that someone who misremembers must be lying as it is to defend a false memory in the face of contradictory evidence. We should be more understanding of mistakes by others, and credit them when they admit they were wrong. We are all fabulists, and we must all get used to it.

Subliminal is a good book on this subject, as is Thinking, Fast and Slow. It is not merely that our memory is a game of telephone in which we garble the memory as we retrieve and re-store it. It appears to be a very useful part of existence, which has stayed with us or gotten stronger with evolution. There seems to be utility in forgetting, misremembering, and having memories coalesce with those of others in our social groups.

not only did the brains of the mental athletes appear anatomically indistinguishable from those of the control subjects, but on every test of general cognitive ability, the mental athletes’ scores came back well within the normal range.

There was, however, one telling difference between the brains of the mental athletes and those of the control subjects. When the researchers looked at the parts of the brain that were engaged when the subjects memorized, they found that the mental athletes were relying more heavily on regions known to be involved in spatial memory.

just about anything could be imprinted upon our memories, and kept in good order, simply by constructing a building in the imagination and filling it with imagery of what needed to be recalled. This imagined edifice could then be walked through at any time in the future. Such a building would later come to be called a memory palace.

Memory training was considered a centerpiece of classical education in the language arts, on par with grammar, logic and rhetoric. Students were taught not just what to remember but how to remember it. In a world with few books, memory was sacrosanct.

In his essay “First Steps Toward a History of Reading,” Robert Darnton describes a switch from “intensive” to “extensive” reading that occurred as printed books began to proliferate.

Until relatively recently, people read “intensively,” Darnton says. “They had only a few books — the Bible, an almanac, a devotional work or two — and they read them over and over again, usually aloud and in groups, so that a narrow range of traditional literature became deeply impressed on their consciousness.” Today we read books “extensively,” often without sustained focus, and with rare exceptions we read each book only once. We value quantity of reading over quality of reading.

“Rhetorica ad Herennium” underscores the importance of purposeful attention by making a distinction between natural memory and artificial memory:

Our hunter-gatherer ancestors didn’t need to recall phone numbers or word-for-word instructions from their bosses or the Advanced Placement U.S. history curriculum or (because they lived in relatively small, stable groups) the names of dozens of strangers at a cocktail party. What they did need to remember was where to find food and resources and the route home and which plants were edible and which were poisonous

What distinguishes a great mnemonist, I learned, is the ability to create lavish images on the fly, to paint in the mind a scene so unlike any other it cannot be forgotten. And to do it quickly. Many c

the three stages of acquiring a new skill. During the first phase, known as the cognitive phase, we intellectualize the task and discover new strategies to accomplish it more proficiently. During the second

Since search engines are continually available to us, we may often be in a state of not feeling we need to encode the information internally. When we need it, we will look it up."

when people expect information to remain continuously available (such as we expect with Internet access), we are more likely to remember where to find it than we are to remember the details of the item."

we've never had an "external memory" so capacious, so available and so easily searched as the web. If, as this study suggests, the way we form (or fail to form) memories is deeply influenced by the mere existence of external information stores, then we may be entering an era in history in which we will store fewer and fewer memories inside our own brains.

If a fact stored externally were the same as a memory of that fact stored in our mind, then the loss of internal memory wouldn't much matter. But external storage and biological memory are not the same thing. When we form, or "consolidate," a personal memory, we also form associations between that memory and other memories that are unique to ourselves and also indispensable to the development of deep, conceptual knowledge. The associations, moreover, continue to change with time, as we learn more and experience more. As Emerson understood, the essence of personal memory is not the discrete facts or experiences we store in our mind but "the cohesion" which ties all those facts and experiences together. What is the self but the unique pattern of that cohesion?

as memory shifts from the individual mind to the machine's shared database, what happens to that unique "cohesion" that is the self?

30 years ago, he says he saw plenty of “dowagers’ humps, where the upper back had frozen into a forward curve, in grandmothers and great-grandmothers.” Now he says he’s seeing the same stoop in teenagers.

When we’re sad, we slouch. We also slouch when we feel scared or powerless. Studies have shown that people with clinical depression adopt a posture that eerily resembles the iHunch.

Posture doesn’t just reflect our emotional states; it can also cause them.

assigned non-depressed participants to sit in an upright or slouched posture and then had them answer a mock job-interview question, a well-established experimental stress inducer, followed by a series of questionnaires. Compared with upright sitters, the slouchers reported significantly lower self-esteem and mood, and much greater fear.

Posture affected even the contents of their interview answers: Linguistic analyses revealed that slouchers were much more negative in what they had to say. The researchers concluded, “Sitting upright may be a simple behavioral strategy to help build resilience to stress.”

Slouching can also affect our memory

clinical depression, participants were randomly assigned to sit in either a slouched or an upright position and then presented with a list of positive and negative words. When they were later asked to recall those words, the slouchers showed a negative recall bias (remembering the bad stuff more than the good stuff), while those who sat upright showed no such bias.

Japanese schoolchildren, those who were trained to sit with upright posture were more productive than their classmates in writing assignments.

We found that the size of the device significantly affected whether subjects felt comfortable seeking out the experimenter, suggesting that the slouchy, collapsed position we take when using our phones actually makes us less assertive — less likely to stand up for ourselves when the situation calls for it.

In fact, there appears to be a linear relationship between the size of your device and the extent to which it affects you: the smaller the device, the more you must contract your body to use it, and the more shrunken and inward your posture, the more submissive you are likely to become.

Keep your head up and shoulders back when looking at your phone, even if that means holding it at eye level.

Your physical posture sculpts your psychological posture, and could be the key to a happier mood and greater self-confidence.

he has seen mounting evidence that using a smartphone, or even hearing one ring or vibrate, produces a welter of distractions that makes it harder to concentrate on a difficult problem or job. The division of attention impedes reasoning and performance.

Another 2015 study, appearing in the Journal of Computer-Mediated Communication, showed that when people hear their phone ring but are unable to answer it, their blood pressure spikes, their pulse quickens, and their problem-solving skills decline.

The researchers recruited 520 undergraduates at UCSD and gave them two standard tests of intellectual acuity. One test gauged “available working-memory capacity,” a measure of how fully a person’s mind can focus on a particular task. The second assessed “fluid intelligence,” a person’s ability to interpret and solve an unfamiliar problem. The only variable in the experiment was the location of the subjects’ smartphones. Some of the students were asked to place their phones in front of them on their desks; others were told to stow their phones in their pockets or handbags; still others were required to leave their phones in a different room.

In both tests, the subjects whose phones were in view posted the worst scores, while those who left their phones in a different room did the best. The students who kept their phones in their pockets or bags came out in the middle. As the phone’s proximity increased, brainpower decreased.

In subsequent interviews, nearly all the participants said that their phones hadn’t been a distraction—that they hadn’t even thought about the devices during the experiment. They remained oblivious even as the phones disrupted their focus and thinking.

In a 2013 study conducted at the University of Essex in England, 142 participants were divided into pairs and asked to converse in private for ten minutes. Half talked with a phone in the room, half without a phone present. The subjects were then given tests of affinity, trust and empathy. “The mere presence of mobile phones,” the researchers reported in the Journal of Social and Personal Relationships, “inhibited the development of interpersonal closeness and trust” and diminished “the extent to which individuals felt empathy and understanding from their partners.”

the “integration of smartphones into daily life” appears to cause a “brain drain” that can diminish such vital mental skills as “learning, logical reasoning, abstract thought, problem solving, and creativity.”

 Smartphones have become so entangled with our existence that, even when we’re not peering or pawing at them, they tug at our attention, diverting precious cognitive resources. Just suppressing the desire to check our phone, which we do routinely and subconsciously throughout the day, can debilitate our thinking.

They found that students who didn’t bring their phones to the classroom scored a full letter-grade higher on a test of the material presented than those who brought their phones. It didn’t matter whether the students who had their phones used them or not: All of them scored equally poorly.

A study of nearly a hundred secondary schools in the U.K., published last year in the journal Labour Economics, found that when schools ban smartphones, students’ examination scores go up substantially, with the weakest students benefiting the most.

Social skills and relationships seem to suffer as well.

Because smartphones serve as constant reminders of all the friends we could be chatting with electronically, they pull at our minds when we’re talking with people in person, leaving our conversations shallower and less satisfying.

A second experiment conducted by the researchers produced similar results, while also revealing that the more heavily students relied on their phones in their everyday lives, the greater the cognitive penalty they suffered.

The evidence that our phones can get inside our heads so forcefully is unsettling. It suggests that our thoughts and feelings, far from being sequestered in our skulls, can be skewed by external forces we’re not even aware o

 Scientists have long known that the brain is a monitoring system as well as a thinking system. Its attention is drawn toward any object that is new, intriguing or otherwise striking — that has, in the psychological jargon, “salience.”

even in the history of captivating media, the smartphone stands out. It is an attention magnet unlike any our minds have had to grapple with before. Because the phone is packed with so many forms of information and so many useful and entertaining functions, it acts as what Dr. Ward calls a “supernormal stimulus,” one that can “hijack” attention whenever it is part of our surroundings — and it is always part of our surroundings.

Imagine combining a mailbox, a newspaper, a TV, a radio, a photo album, a public library and a boisterous party attended by everyone you know, and then compressing them all into a single, small, radiant object. That is what a smartphone represents to us. No wonder we can’t take our minds off it.

The irony of the smartphone is that the qualities that make it so appealing to us — its constant connection to the net, its multiplicity of apps, its responsiveness, its portability — are the very ones that give it such sway over our minds.

Phone makers like Apple and Samsung and app writers like Facebook, Google and Snap design their products to consume as much of our attention as possible during every one of our waking hours

Social media apps were designed to exploit “a vulnerability in human psychology,” former Facebook president Sean Parker said in a recent interview. “[We] understood this consciously. And we did it anyway.”

A quarter-century ago, when we first started going online, we took it on faith that the web would make us smarter: More information would breed sharper thinking. We now know it’s not that simple.

As strange as it might seem, people’s knowledge and understanding may actually dwindle as gadgets grant them easier access to online data stores

In a seminal 2011 study published in Science, a team of researchers — led by the Columbia University psychologist Betsy Sparrow and including the late Harvard memory expert Daniel Wegner — had a group of volunteers read forty brief, factual statements (such as “The space shuttle Columbia disintegrated during re-entry over Texas in Feb. 2003”) and then type the statements into a computer. Half the people were told that the machine would save what they typed; half were told that the statements would be erased.

Afterward, the researchers asked the subjects to write down as many of the statements as they could remember. Those who believed that the facts had been recorded in the computer demonstrated much weaker recall than those who assumed the facts wouldn’t be stored. Anticipating that information would be readily available in digital form seemed to reduce the mental effort that people made to remember it

The researchers dubbed this phenomenon the “Google effect” and noted its broad implications: “Because search engines are continually available to us, we may often be in a state of not feeling we need to encode the information internally. When we need it, we will look it up.”

as the pioneering psychologist and philosopher William James said in an 1892 lecture, “the art of remembering is the art of thinking.”

Only by encoding information in our biological memory can we weave the rich intellectual associations that form the essence of personal knowledge and give rise to critical and conceptual thinking. No matter how much information swirls around us, the less well-stocked our memory, the less we have to think with.

As Dr. Wegner and Dr. Ward explained in a 2013 Scientific American article, when people call up information through their devices, they often end up suffering from delusions of intelligence. They feel as though “their own mental capacities” had generated the information, not their devices. “The advent of the ‘information age’ seems to have created a generation of people who feel they know more than ever before,” the scholars concluded, even though “they may know ever less about the world around them.”

That insight sheds light on society’s current gullibility crisis, in which people are all too quick to credit lies and half-truths spread through social media. If your phone has sapped your powers of discernment, you’ll believe anything it tells you.

Data, the novelist and critic Cynthia Ozick once wrote, is “memory without history.” Her observation points to the problem with allowing smartphones to commandeer our brains

When we constrict our capacity for reasoning and recall or transfer those skills to a gadget, we sacrifice our ability to turn information into knowledge. We get the data but lose the meaning

We need to give our minds more room to think. And that means putting some distance between ourselves and our phones.

Harvard Business School professor emerita Shoshana Zuboff argues in her new book that the Valley’s wealth and power are predicated on an insidious, essentially pathological form of private enterprise—what she calls “surveillance capitalism.” Pioneered by Google, perfected by Facebook, and now spreading throughout the economy, surveillance capitalism uses human life as its raw material. Our everyday experiences, distilled into data, have become a privately-owned business asset used to predict and mold our behavior, whether we’re shopping or socializing, working or voting.

By reengineering the economy and society to their own benefit, Google and Facebook are perverting capitalism in a way that undermines personal freedom and corrodes democracy.

Under the Fordist model of mass production and consumption that prevailed for much of the twentieth century, industrial capitalism achieved a relatively benign balance among the contending interests of business owners, workers, and consumers. Enlightened executives understood that good pay and decent working conditions would ensure a prosperous middle class eager to buy the goods and services their companies produced. It was the product itself — made by workers, sold by companies, bought by consumers — that tied the interests of capitalism’s participants together. Economic and social equilibrium was negotiated through the product.

By removing the tangible product from the center of commerce, surveillance capitalism upsets the equilibrium. Whenever we use free apps and online services, it’s often said, we become the products, our attention harvested and sold to advertisers

this truism gets it wrong. Surveillance capitalism’s real products, vaporous but immensely valuable, are predictions about our future behavior — what we’ll look at, where we’ll go, what we’ll buy, what opinions we’ll hold — that internet companies derive from our personal data and sell to businesses, political operatives, and other bidders.

Unlike financial derivatives, which they in some ways resemble, these new data derivatives draw their value, parasite-like, from human experience.To the Googles and Facebooks of the world, we are neither the customer nor the product. We are the source of what Silicon Valley technologists call “data exhaust” — the informational byproducts of online activity that become the inputs to prediction algorithms

internet companies operate in what Zuboff terms “extreme structural independence from people.” When databases displace goods as the engine of the economy, our own interests, as consumers but also as citizens, cease to be part of the negotiation. We are no longer one of the forces guiding the market’s invisible hand. We are the objects of surveillance and control.