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Mental labour can also be exhausting. Even resisting that last glistening chocolate-chip cookie after a long day at a consuming desk job is difficult. Cognitive control, the umbrella term encompassing mental exertion, self-control and willpower, also fades with effort.

unlike the mechanism of physical fatigue, the cause of cognitive fatigue has been poorly understood.

It posits that exerting cognitive control uses up energy in the form of glucose. At the end of a day spent intensely cogitating, the brain is metaphorically running on fumes. The problem with this version of events is that the energy cost associated with thinking is minimal.

“Researchers say our brains aren’t wired to make sense of big numbers.” A story about a single tragic death evokes waves of sadness and emotion in us. We focus on the individual’s details, their life story, and the circumstances of their death. As the number of victims increases, our ability to muster empathy fades, something often called compassion fatigue.

If we talk instead about multiple people like Constance Johnson at once or just give the numbers involved—about 4,200 women die every year from cervical cancer—the information loses its impact. We don’t comprehend a number like 4,200 the way we do the story of a single individual.

As the results of a study by Paul Slovic and colleagues in 2014 showed, the tendency to be charitable and feel compassion diminishes rapidly as the number of people involved increases from one.

“What can I even do?”Many people are feeling similarly defeated, and many others are outraged by the political inaction that ensues. A Muslim colleague of mine said she was appalled to see so much indifference to the atrocities and innocent lives lost in Gaza and Israel. How could anyone just go on as if nothing had happened?

inaction isn’t always caused by apathy. It can also be the product of empathy. More specifically, it can be the result of what psychologists call empathic distress: hurting for others while feeling unable to help.

I felt it intensely this fall, as violence escalated abroad and anger echoed across the United States. Helpless as a teacher, unsure of how to protect my students from hostility and hate. Useless as a psychologist and writer, finding words too empty to offer any hope. Powerless as a parent, searching for ways to reassure my kids that the world is a safe place and most people are good. Soon I found myself avoiding the news altogether and changing the subject when war came up

members of the upper class are more likely than others to behave unethically, to lie during negotiations, to drive illegally and to cheat when competing for a prize.“Greed is a robust determinant of unethical behavior,” the authors conclude. “Relative to lower-class individuals, individuals from upper-class backgrounds behaved more unethically in both naturalistic and laboratory settings.”

Our findings suggest that when a person is suffering, upper-class individuals perceive these signals less well on average, consistent with other findings documenting reduced empathic accuracy in upper-class individuals (Kraus et al., 2010). Taken together, these findings suggest that upper-class individuals may underestimate the distress and suffering in their social environments.

each participant was assigned to listen, face to face, from two feet away, to someone else describing real personal experiences of suffering and distress.The listeners’ responses were measured two ways, first by self-reported levels of compassion and second by electrocardiogram readings to determine the intensity of their emotional response. The participants all took a test known as the “sense of power” scale, ranking themselves on such personal strengths and weaknesses as ‘‘I can get people to listen to what I say’’ and ‘‘I can get others to do what I want,” as well as ‘‘My wishes do not carry much weight’’ and ‘‘Even if I voice them, my views have little sway,’’ which are reverse scored.The findings were noteworthy, to say the least. For “low-power” listeners, compassion levels shot up as the person describing suffering became more distressed. Exactly the opposite happened for “high-power” listeners: their compassion dropped as distress rose.

Just as vigorous exercise tires our bodies, intellectual exertion should drain the brain. What the latest science reveals, however, is that the popular notion of mental exhaustion is too simplistic. The brain continuously slurps up huge amounts of energy for an organ of its size, regardless of whether we are tackling integral calculus or clicking through the week's top 10 LOLcats. Although firing neurons summon extra blood, oxygen and glucose, any local increases in energy consumption are tiny compared with the brain's gluttonous baseline intake. So, in most cases, short periods of additional mental effort require a little more brainpower than usual, but not much more.

something must explain the feeling of mental exhaustion, even if its physiology differs from physical fatigue. Simply believing that our brains have expended a lot of effort might be enough to make us lethargic.

a typical adult human brain runs on around 12 watts—a fifth of the power required by a standard 60 watt lightbulb. Compared with most other organs, the brain is greedy; pitted against man-made electronics, it is astoundingly efficient. IBM's Watson, the supercomputer that defeated Jeopardy! champions, depends on ninety IBM Power 750 servers, each of which requires around one thousand watts.

The World Health Organization reports that suicide rates have increased 60 percent over the past 50 years, most strikingly in the developing world, and that by 2020 depression will be the second most prevalent medical condition in the world.

n 2011, the Centers for Disease Control and Prevention reported that the rate of antidepressant use in the United States rose by 400 percent between 1988 and 2008.

there is reason to believe that mental illness is indeed increasing around the world, if only because urbanization is increasing. By 2010, for the first time in history, more than half the world’s population lived in cities.

But in a survey conducted by the Alzheimer’s Society, half of relatives said that their loved ones’ memories had got worse after they began living more isolated lives.   

The most obvious factor is isolation. We know that a lack of social contact can affect the brain negatively and that the effect is most serious in those already experiencing memory difficulties.

Of course, not everyone has felt lonely during the pandemic, and the results of some studies have shown that levels of loneliness have plateaued over time.

“The days are long, but the years are short.” Except in the pandemic, she said, “the days are long, and the year is also long.”

You’re not alone if you feel that 2020, perhaps the most dramatic and memorable year of our lifetimes — and that’s before Election Day — seems shuffled and disordered, like a giant blur. A dream state, or perhaps a nightmare.

That’s the paradox of 2020, or one of them: A year so momentous also feels, in a way, as if nothing happened at all.

There’s a special kind of exhaustion that the world’s best endurance athletes embrace. Some call it masochistic, others may call it brave. When fatigue sends legs and lungs to their limits, they are able to push through to a gear beyond their pain threshold. These athletes approach fatigue not with fear but as a challenge, an opportunity.

It’s a quality that allows an ultramarathoner to endure what could be an unexpected rough segment of an 100-mile race, or a sailor to push ahead when she’s in the middle of the ocean, racing through hurricane winds alone.

The drive to persevere is something some are born with, but it’s also a muscle everyone can learn to flex. In a way, everyone has become an endurance athlete of sorts during this pandemic, running a race with no finish line that tests the limits of their exhaustion.

Pilot often tops the list of most stressful careers, both in the amount of perceived stress and on quantifiable metrics of stress, like rates of burnout and health issues

For pilots, the basic requirements of the job are a major source of stress. “Number one, it’s what we call a high-consequence industry,” Bowen says. “When pilots make mistakes, the consequences can be catastrophic.”

sychologists think about stress on a curve: At the bottom, without stress, it’s hard to perform with excellence. As stress and arousal start to creep up, performance does too.

As the car hummed along and we relived his spiritual journey, I asked Lynch what he really believed. Did he see Transcendental Meditation as simply a technique for relaxation, perfect for young Hollywood actresses, or rather as an all-encompassing way of life, as Maharishi had encouraged — one with peace palaces and an army of meditators fomenting world peace? Lynch paused, and then spoke for more than five minutes, explaining that T.M. was the answer for all seeking true inner happiness. He ended with this thought: “Things like traumatic stress and anxiety and tension and sorrow and depression and hate and bitter, selfish anger and fear start to lift away. And that’s a huge sense of freedom when that heavy weight of negativity begins to lift. So it’s like gold flowing in from within and garbage going out. The things in life that used to almost kill you, stress you, depress you, make you sad, make you afraid — they have less and less power. It’s like you’re building up a flak jacket of protection. You’re starting to glow with this from within.”

I still meditate. For 20 minutes or more, twice a day, I’m able to step back from the news scroll of thoughts and be truly quiet. I use T.M. to deal with anxiety and fatigue and to stave off occasional despair. But that’s because, in my head, I’ve managed to excise the weird flotsam of spirituality that engulfed T.M. for the first part of my life. Now, for me, it is something very simple, like doing yoga or avoiding dairy. Objectively speaking, meditation has been shown to decrease the incidence of heart attacks and strokes and increase longevity. The Department of Veterans Affairs and the Department of Defense commissioned studies to determine whether T.M. can help veterans alleviate post-traumatic stress disorder. Thanks to the David Lynch foundation, low-performing public schools have instituted “Quiet Time,” an elective 10 minutes, twice a day, during which students meditate, with some encouraging results.

The office of the David Lynch Foundation for Consciousness-Based Education and World Peace in New York is filled with young adults, many of whom grew up practicing Transcendental Meditation. Since Lynch started spreading the good news about T.M., the number of people learning the technique has increased tenfold. Close to Lynch’s heart are those suffering from PTSD, it seems, but it is in his own industry that he has made a more visible impact. Roth, who runs the foundation, spends much of his time flying around the world as well as initiating a long list of public figures: Gwyneth Paltrow, Ellen DeGeneres, Russell Simmons, Katy Perry, Susan Sarandon, Candy Crowley, Soledad O’Brien, George Stephanopoulos and Paul McCartney’s grandchildren.

When you think of heart attacks, you might assume the most common causes are smoking, high cholesterol, or obesity. Mental health issues probably don't spring to mind.

Depression—which for this study, was determined by a checklist of mood symptoms, including anxiety and fatigue

“depressed mood and exhaustion holds a solid middle position within the concert of major cardiovascular risk factors.”

the “demarcation problem,” the issue of what separates good science from bad science and pseudoscience (and everything in between). The problem is relevant for at least three reasons.

The first is philosophical: Demarcation is crucial to our pursuit of knowledge; its issues go to the core of debates on epistemology and of the nature of truth and discovery.

The second reason is civic: our society spends billions of tax dollars on scientific research, so it is important that we also have a good grasp of what constitutes money well spent in this regard.

We rely on computers to fly our planes, find our cancers, design our buildings, audit our businesses. That's all well and good. But what happens when the computer fails?

On the evening of February 12, 2009, a Continental Connection commuter flight made its way through blustery weather between Newark, New Jersey, and Buffalo, New York.

The Q400 was well into its approach to the Buffalo airport, its landing gear down, its wing flaps out, when the pilot’s control yoke began to shudder noisily, a signal that the plane was losing lift and risked going into an aerodynamic stall. The autopilot disconnected, and the captain took over the controls. He reacted quickly, but he did precisely the wrong thing: he jerked back on the yoke, lifting the plane’s nose and reducing its airspeed, instead of pushing the yoke forward to gain velocity.

In recent decades, behavioral economics has been the economics profession’s runaway growth area. Scholars in this field work largely at the intersection of economics and psychology, and much of their attention has focused on systematic biases in people’s judgments and decisions.

Paradoxically, our prediction errors often lead us to choices that are wisest in hindsight. In such cases, evolutionary biology often provides a clearer guide than cognitive psychology for thinking about why people behave as they do.

the brain has evolved not to make us happy, but to motivate actions that help push our DNA into the next round. Much of the time, in fact, the brain accomplishes that by making us unhappy. Anxiety, hunger, fatigue, loneliness, thirst, anger and fear spur action to meet the competitive challenges we face.

The best way to eliminate grade inflation is to take professors out of the grading process: Replace them with professional evaluators who never meet the students, and who don't worry that students will punish harsh grades with poor reviews. That's the argument made by leaders of Western Governors University, which has hired 300 adjunct professors who do nothing but grade student work.

These efforts raise the question: What if professors aren't that good at grading? What if the model of giving instructors full control over grades is fundamentally flawed? As more observers call for evidence of college value in an era of ever-rising tuition costs, game-changing models like these are getting serious consideration.

Professors do score poorly when it comes to fair grading, according to a study published in July in the journal Teachers College Record. After crunching the numbers on decades' worth of grade reports from about 135 colleges, the researchers found that average grades have risen for 30 years, and that A is now the most common grade given at most colleges. The authors, Stuart Rojstaczer and Christopher Healy, argue that a "consumer-based approach" to higher education has created subtle incentives for professors to give higher marks than deserved. "The standard practice of allowing professors free rein in grading has resulted in grades that bear little relation to actual performance," the two professors concluded.

But some people have long-lasting symptoms after their infection – this has been dubbed “long COVID”.

In defining who is at risk from long COVID and the mechanisms involved, we may reveal suitable treatments to be tried – or whether steps taken early in the course of the illness might ameliorate it.

Indeed, early analysis of self-reported data submitted through the COVID Symptom Study app suggests that 13% of people who experience COVID-19 symptoms have them for more than 28 days, while 4% have symptoms after more than 56 days.

For years, we’ve been told how detrimental a lack of sleep can be for our mental and physical health.

But is it bad to get too much sleep — and if so, how much is too much?

“It’s important to remember that not everyone’s ‘too much sleep’ is the same,” sleep psychologist Jade Wu, a researcher at the Duke University School of Medicine, told HuffPost. “And sleep needs change over the lifetime. For example, a teenager or young adult may very well need nine or more hours per night, whereas a retiree likely doesn’t.”