There's very little scientific evidence to suggest our perception of time changes as we age. And yet, we consistently report that the past felt longer — that time is flying by faster as we age. What's going on?

Scientists can look at time estimation, or our ability to estimate how long a minute passes, compared with a clock. (This is what Sothern is doing.) They can also look at time awareness, or the broad feeling that time is moving quickly or slowly. Finally there's time perspective, the sense of a past, present, and future as constructed by our memories.

What researchers have found out is that while time estimation and time awareness don't change much as we age, time perspective does. In other words: Our memories create the illusion time is accelerating.

There weren't many differences between the old and the young. "[C]hronological age showed no systematic influence on the perception of these brief intervals of time up," the authors wrote. (That said, the researchers did find that males overestimate time while females underestimate it, perhaps due to having slightly different circadian clocks and therefore slightly different metabolic rates

Here, too, age seemed not to matter. Older people didn't seem to be aware of time passing any faster than younger people. The only question that yielded a statistically significant difference was, "How fast did the last decade pass?" Even there, the reported differences were tiny, and the effect appeared to plateau around age 50.

psychologists William Friedman and Steve Janssen found scant evidence that the subjective experience of time speeds up with age. They write in their 2009 paper, "We can concluded that when adults report on their general impressions of the speed of time, age differences are very small."

When people reflect back on their own life, they feel like their early years went by very slowly and their later years go by more quickly. This could be the source of the belief that time goes more quickly as they age.

One possibility is that participants were simply biased by the (incorrect) conventional wisdom — they reported their later years as flying by more quickly because that's what everyday lore says should happen.

 "Most people feel that time is currently passing faster for them than it did in the past," Janssen writes me in an email. "They have forgotten how they experienced the passage of time when they were younger."

We use significant events as signposts to gauge the passage of time. The fewer events, the faster time seems to go by.

Childhood is full of big, memorable moments like learning to ride a bike or making first friends. By contrast, adult life becomes ordinary and mechanized, and ambles along by.

Each passing year converts some of this experience into automatic routine which we hardly notice at all, the days and weeks smooth themselves out in recollection, and the years grow hollow and collapse.

Each new minute represents a smaller fraction of our lives. One day as a 10 year old represents about .027 percent of the kid's life. A day for a 60 year old? .0045 percent. The kid's life is just... bigger.

Also, our ability to recall events declines with age. If we can't remember a time, it didn't happen.

"[F]inding that there is insufficient time to get things done may be reinterpreted as the feeling that time is passing quickly," they write. Deadlines always come sooner than we'd like.

Psychologists have long understood the phenomenon called "forward telescoping" — i.e., our tendency to underestimate how long ago very memorable events occurred. "Because we know that memories fade over time, we use the clarity of a memory as a guide to its recency," science writer Claudia Hammond writes in her book Time Warped. "So if a memory seems unclear we assumed it happened longer ago." But very clear memories are assumed to be more recent.

If our memories can trick us into thinking time is moving quickly, then maybe there are ways to trick our brains into thinking that time is slowing down — such as committing to breaking routines and learning new things. You're more likely to remember learning how to skydive than watching another hour of mindless television.

Mark Zuckerberg is 3.17 degrees of separation from all Facebook users.

The typical Facebook user has 155 friends, but only describes 50 of them as friends in real life, according to a 2014 study from the Pew Research Center. Thirty-five percent of people have Facebook friends they've never met in person.

The original "six degrees of separation" experiment required people to know each other fairly well: They had to be on a first-name basis, at a time when society was slightly more formal, in order for the connection to count.

About one-third of the documents eventually reached the stockbroker, after a chain of, on average, six people — the six degrees of separation. It's a small world after all, Milgram concluded.

She found instead that Milgram's conclusions rested on a shaky foundation, and that class and race divided Americans more than his original paper admitted. The majority of Milgram's letters didn't make it to the Boston stockbroker. And further experiments that factored in class and race suggested that making connections across those barriers was even more challenging

While middle- and high-income people were able to find their targets regardless of their household income, low-income people could only connect with other low-income families, Kleinfeld wrote in a 2002 article in the journal Society.

The correct interpretation of Milgram, she argued, was not the optimistic conclusion that we're all only a few degrees of separation away. Instead, it's that there are still barriers that are insurmountable.

But the real divide is between people who are on Facebook and those who aren't on the internet at all. Facebook users make up about 62 percent of American adults but 72 percent of all internet users. Americans without the internet are disproportionately older, rural, and less educated. As Facebook users get closer, they might be becoming ever more isolated.

"The classic finding — I would say it is the most replicated finding in psychology — is that people who are good at one type of mental task tend to be good at them all,"

G-factor is real in the sense it can predict outcomes in our lives — how much money you'll make, how productive of a worker you might be, and, most chillingly, how likely you are to die an earlier death.

According to the research, people with high IQs tend to be healthier and live longer than the rest of us

One is the fact that people with higher IQs tend to make more money than people with lower scores. Money is helpful in maintaining weight, nutrition, and accessing good health care.

IQ often beats personality when it comes to predicting life outcomes: Personality traits, a recent study found, can explain about 4 percent of the variance in test scores for students under age 16. IQ can explain 25 percent, or an even higher proportion, depending on the study.

Many of these correlations are less than .5, which means there's plenty of room for individual differences. So, yes, very smart people who are awful at their jobs exist. You're just less likely to come across them.

The correlation between IQ and happiness is usually positive, but also usually smaller than one might expect (and sometimes not statistically significant)," Ritchie says.

It could also be that people with higher IQs are smart enough to avoid accidents and mishaps. There's actually some evidence to support this: Higher-IQ people are less likely to die in traffic accidents.

Even though intelligence generally declines with age, those who had high IQs as children were most likely to retain their smarts as very old people.

"If we know the genes related to intelligence — and we know these genes are related to cognitive decline as well — then we can start to a predict who is going to have the worst cognitive decline, and devote health care medical resources to them," he says.

Studies comparing identical and fraternal twins find about half of IQ can be explained by genetics.

genetics seems to become more predictive of IQ with age.

The idea is as we age, we grow more in control of our environments. Those environments we create can then "amplify" the potential of our genes.

About half the variability in IQ is attributed to the environment. Access to nutrition, education, and health care appear to play a big role.

People’s lives are really messy, and the environments they are in are messy. There’s a possibility that a lot of the environmental effect on a person’s intelligence is random."

Hurray! Mean IQ scores appear to be increasing between 2 and 3 points per decade.

This phenomenon is know as the Flynn effect, and it is likely the result of increasing quality of childhood nutrition, health care, and education.

For example, psychologist Tim Pychyl has co-authored a paper showing that students who forgave themselves for procrastinating on a previous exam were actually less likely to procrastinate on their next test. He and others have also found that people prone to procrastination are, overall, less compassionate toward themselves — an insight that points to ways to help.

But psychologists see procrastination as a misplaced coping mechanism, as an emotion-focused coping strategy. [People who procrastinate are] using avoidance to cope with emotions, and many of them are unconscious emotions.

they found our brain processes present self and future self differently. We think of future self more like a stranger.

I used to procrastinate, and now I don't, because I got all these wicked strategies. And it’s every level: some of it’s behavioral, some of it’s emotional, some of it’s cognitive.

Whenever we face a task, we’re not going to feel like doing it. Somehow adults believe that their motivational state has to match the task at hand. We say, "I’m not in the mood." Our motivational state rarely matches the task at hand, so we always have to use self-regulation skills to bring our focus to it. So at first it will be, "Okay, I recognize that I don’t feel like it, but I’m just gonna get started."

We know from psychological research by [Andrew] Elliot and others that progress on our goals feeds our well-being. So the most important thing you can do is bootstrap a little progress. Get a little progress, and that’s going to fuel your well-being and your motivation.

mplementation intentions take the form of "If, then." "If the phone rings, then I’m not going to answer it." "If my friends call me to say we’re going out, I’m going to say no." So you’ve already made this pre-commitment.

OHIO rule: only handle it once. And I’m like that with email. I look at that email and say, "I can reply to it now, or I can throw it out," but there’s not much of a middle ground. I’m not going to save it for a while.

We [think] that people will make less procrastinatory choices now because they’ll realize that "It’s me in the future we’re talking about here. I’m going to be under the gun."

Roughly 5 percent of the population has such a problem with chronic procrastination that it seriously affects their lives

Conventional wisdom has long suggested that procrastination is all about poor time management and willpower. But more recently, psychologists have been discovering that it may have more to do with how our brains and emotions work.

Procrastination, they've realized, appears to be a coping mechanism. When people procrastinate, they're avoiding emotionally unpleasant tasks and instead doing something that provides a temporary mood boost. The procrastination itself then causes shame and guilt — which in turn leads people to procrastinate even further, creating a vicious cycle.

But psychologists see procrastination as a misplaced coping mechanism, as an emotion-focused coping strategy. [People who procrastinate are] using avoidance to cope with emotions, and many of them are unconscious emotions.

Recently we’ve been doing research that relates to the work on "present self"/"future self" because what’s happening with procrastination is that "present self" is always trumping "future self."

He’s shown that in experimental settings if someone sees their own picture digitally aged, they’re more likely to allocate funds to retirement. When [the researchers] did the fMRI studies, they found our brain processes present self and future self differently. We think of future self more like a stranger.

The people who see the present and future self as more overlapping have more self-continuity and report less procrastination.

e [think] that people will make less procrastinatory choices now because they’ll realize that "It’s me in the future we’re talking about here. I’m going to be under the gun."

Our motivational state rarely matches the task at hand, so we always have to use self-regulation skills to bring our focus to it. So at first it will be, "Okay, I recognize that I don’t feel like it, but I’m just gonna get started."

Implementation intentions take the form of "If, then." "If the phone rings, then I’m not going to answer it." "If my friends call me to say we’re going out, I’m going to say no." So you’ve already made this pre-commitment.

Because it’s all about self-deception — you aren’t aware that it’s going to cost you, but you are.

OHIO rule: only handle it once. And I’m like that with email. I look at that email and say, "I can reply to it now, or I can throw it out," but there’s not much of a middle ground. I’m not going to save it for a while.

And it’s every level: some of it’s behavioral, some of it’s emotional, some of it’s cognitive

According to Loftus's study, the majority of false confessions occur when interrogations last more than 12 hours.

Only about 18 percent of the well-rested participants signed the form (such is the baseline power of an authority figure demanding guilt). But the results were more dramatic in the sleep-deprived condition. "That 18 percent now has risen to 50 percent," Loftus says.

hen they were told a second time to sign the form and admit their guilt, 68 percent of sleep-deprived participants gave in. (On the second request, 38 percent of the rested participants signed.)

"It would probably be scientifically prudent to go out and demonstrate it again with a more serious paradigm," Loftus admits. But there are also ethical limits to how far researchers can manipulate participants into thinking they've done something horrible.

She's also found that through subtle suggestions, people can be made to recall childhood memories that never happened.

a lack of serotonin may lead to the obsessive, irrationally jealous behavior we see in some people.

Given that we think of love as a positive emotion, it's a bit surprising that she found reduced levels of serotonin in these people, compared to controls. Even more surprising, though, is that they were as low as other study participants who had obsessive compulsive order — so low, she says, that "my biologists came back to me and assumed that the readings were from people who suffered from OCD."

When Zeki has put people who have fallen in love inside of fMRI machines and shown them photos of their lovers, he's detected reduced activity in the amygdala — a pair of brain regions that are involved in decision-making. Amygdala activity is typically heightened during fearful or stressful situations, and research suggests that we use it when making social judgements and trying to determine if other people are lying.

"When you're rejected in love, we still find activity in the VTA — you're still madly in love with that person, after all," she says. "But we also find elevated activity in other brain regions linked with craving, and in a part of the brain associated with the distress that goes along with physical pain."

One positive aspect of the study, though, was that the more time that had passed since the participants' rejection, the lower activity was in another brain region associated with attachment.

Activity was elevated in the VTA — just like in new lovers — but also the ventral pallidum, an area associated with maternal attachment in animal studies.

"Romantic love is giddiness, elation, euphoria, energy. When you're feeling a deep sense of attachment, you're much more calm, and contented."

It's still uncertain why people transition from the first phase of love to the second phase of attachment, but Fisher hypothesizes that they're driven by separate evolutionary mechanisms. The initial flood of obsessive love evolved, she thinks, in order to get you to focus on a single person in order to reproduce. The second phase of attachment, by contrast, evolved to link you to another person for an extended period of time, in order to raise a child.

It's quite possible that our love of music was simply an accident. We originally evolved emotions to help us navigate dangerous worlds (fear) and social situations (joy). And somehow, the tones and beats of musical composition activate similar brain areas.

Nature Neuroscience, led by Zatorre, researchers found that dopamine release is strongest when a piece of music reaches an emotional peak and the listener feels "chills"— the spine-tingling sensation of excitement and awe.

"Music engages the same [reward] system, even though it is not biologically necessary for survival," says Zatorre.

Presumably, we evolved to recognize patterns because it's an essential skill for survival. Does a rustling in the trees mean a dangerous animal is about to attack? Does the smell of smoke mean I should run, because a fire may be coming my way?

Music is a pattern. As we listen, we're constantly anticipating what melodies, harmonies, and rhythms may come next.

That's why we typically don't like styles of music we're not familiar with. When we're unfamiliar with a style of music, we don't have a basis to predict its patterns

We learn through our cultures what sounds constitute music. The rest is random noise.

When we hear a piece of music, its rhythm latches onto us in a process called entrainment. If the music is fast-paced, our heartbeats and breathing patterns will accelerate to match the beat.

Another hypothesis is that music latches onto the regions of the brain attuned to speech — which convey all of our emotions.

"It makes sense that our brains are really good at picking up emotions in speech," the French Institute of Science's Aucouturier says. It's essential to understand if those around us are happy, sad, angry, or scared. Much of that information is contained in the tone of a person's speech. Higher-pitched voices sound happier. More warbled voices are scared.

Music may then be an exaggerated version of speech.

And because we tend to mirror the emotions we hear in others, if the music is mimicking happy speech, then the listener will become happy too.

In support of that idea, half a dozen Nobel laureates and other prominent scientists are working with two small companies offering NR supplements.

This time his lab made headlines by reporting that the mitochondria in muscles of elderly mice were restored to a youthful state after just a week of injections with NMN (nicotinamide mononucleotide), a molecule that naturally occurs in cells and, like NR, boosts levels of NAD.

It should be noted, however, that muscle strength was not improved in the NMN-treated mice

a single dose of NR resulted in statistically significant increases” in NAD in humans—the first evidence that supplements could really boost NAD levels in people.

When NAD levels drop, as they do with aging, SIRT1 activity falls off, which in turn makes the crucial signals fade, leading to mitochondrial dysfunction and all the ill effects that go with it.

NAD boosters might work synergistically with supplements like resveratrol to help reinvigorate mitochondria and ward off diseases of aging

Test-tube and rodent studies also suggest that pterostilbene is more potent than resveratrol when it comes to improving brain function, warding off various kinds of cancer and preventing heart disease.

Even before Sinclair's paper, researchers had shown in 2012 that when given doses of NR, mice on high-fat diets gained 60 percent less weight than they did on the same diets without NR. Further, none of the mice on NR showed signs of diabetes, and their energy levels improved. The scientists reportedly characterized NR's effects on metabolism as "nothing short of astonishing."

For those of us seeking to appear friendly and trustworthy to others, a new study underscores an old, chipper piece of advice: Put on a happy face.

the relevance of facial expressions to perceptions of characteristics such as trustworthiness and friendliness.

for those faces lacking structural cues, people could no longer perceive strength but could still perceive personality traits based on facial expressions.

An analysis revealed that participants generally ranked people with a happy expression as friendly and trustworthy but not those with angry expressions.

rank faces as indicative of physical strength based on facial expression but graded faces that were very broad as that of a strong individual.

In the first variation, for faces lacking emotional cues, people could no longer perceive personality traits but could still perceive strength based on width

perceptions of abilities such as physical strength are not dependent on facial expressions but rather on facial bone structure.

As might be expected, participants picked faces with happier expressions as financial advisors and selected broader faces as belonging to power-lifting champs.

Most of the participants found the computer-generated averages to be good representations of trustworthiness or strength — and generally saw the average “financial advisor” face as more trustworthy and the “power-lifter” face as stronger.

he findings suggest facial expressions strongly influence perception of traits such as trustworthiness, friendliness or warmth, but not ability (strength, in these experiments).

facial structure influences the perception of physical ability but not intentions (such as friendliness and trustworthiness, in this instance)

this new work reveals how perceptions of the same person can vary greatly depending on that person’s facial expression in any given moment

The findings above come with a big caveat: Only male faces were shown to subjects.

Studies of facial width and height in females have shown mixed results, so presenting study subjects with a mix of male and female faces would have yielded inconclusive results.

In our everyday lives this study and others make clear that although we might try to influence others’ perceptions of us with photos showing us donning sharp attire or displaying a self-assured attitude, the most important determinant of others' perception of and consequent behavior toward us is our faces.

In this study, a higher consumption of fish seemed to make a big difference in keeping your brain young.

People who ate a diet close to the MIND diet saw a 53% lower risk of developing Alzheimer's.

Even people who ate the MIND diet "most" (as opposed to "all") of the time saw a 35% reduced chance of developing the disease.

It has also been shown as a key to helping you live longer. It helps you manage your weight better and can lower your risk for cancer, and cardiovascular diseases.

But revealingly, when it came to seeing the superior three-star players having the needle injection, the participants' AI and aMCC were eerily quiet. In other words, their brain's automatic empathic response was apparently dampened.

Moreover, when viewing inferior players' suffering, but not the suffering of superior players, the participants' brains showed increased communication between the AI and other regions involved in empathy and perspective-taking

putting themselves mentally and emotionally in the position of the inferior players, but not the superior.

The researchers didn't find any neural evidence that their participants enjoyed watching three-star players' suffering. However, the results do suggest that the automatic simulation of others' pain that normally goes on in our brains was dampened when participants saw a superior player suffering.

It just goes to show how competitive we are by nature and how quick we are to measure ourselves in relation to others

The researchers think the reduced neural empathy we show toward superior people is somehow linked to the way they make us feel bad about ourselves

Of course, it's worth bearing in mind that, like most social neuroscience research, this study involves making a lot of assumptions about the meaning of people's brain-activity patterns. It certainly seems as if the participants were overstating the empathy they felt for the superior players, and that their brains gave away their true feelings. But this is just one interpretation of the results.

It's also a shame, from a methodological point of view, that there wasn't a condition in which the participants looked at equal-status players in pain.

These issues aside, the new results are consistent with, and add to, past research that's shown people's neural empathic responses are diminished when witnessing pain endured by someone they dislike, or someone from a different social group.

We can strive to be good people, but sadly it seems our brains often reveal the darker side of human nature.