Lots of interesting takeouts in bite-sized chunks. While generally I strongly dislike such structure to any material, this is a lucky exclusion to this rule.
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if you are delusional, can’t concentrate for more than 8 seconds, forget people’s names as soon as you are introduced, and can’t stop thinking about sex or food, congratulations. You have a normal human mind. (c)
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Cognitive doodling
A morbid obsession with death affects around 15 per cent of people, but obsessive thinking in general is quite common. We tend to characterise wandering thoughts as random, or loose chains of association, but if you find your mind constantly meanders back to familiar territory you are not alone. Like cognitive doodling, obsessive or ritualistic thinking might just be a way of occupying the idling mind. However, such thoughts once carried an evolutionary advantage, as they prepared us for dealing with future risk. That would explain why they are often to do with possible threats, such as uncleanliness. (c)
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More than one in ten US college students remember similar imaginary worlds and two-thirds of children under the age of seven have imaginary friends. Nor is the phenomenon the preserve of childhood. Agatha Christie reportedly still spoke to her imaginary companion at the age of seventy, and Kurt Cobain addressed his suicide note to his childhood imaginary friend Boddah. More commonly, adults indulge their imaginations through novels, movies and daydreaming.
Why do we spend an inordinate amount of time immersed in worlds that exist only in our heads? (c)
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Defining imagination is difficult. If it is the ability to transcend the here-and-now and use our minds to travel through time and space and beyond, then that includes everything from daydreaming about unicorns, to visualising an event from last weekend, and figuring out how best to get to a social occasion across town that evening. If you go with that definition, then we are constantly using our imagination. (c)
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Imaginary friends serve all kinds of purposes, from being plain old fun to vehicles to express fears, explore emotions and to run experiments on the mysterious adult world. Psychologists talk about a division of labour between childhood and adulthood. The former is a kind of research and development division, where we can experiment with the world and develop our creative minds unencumbered by worries about survival. The skills we acquire during this period prepare us for adulthood – the production and marketing division.
Imaginary friends may also help children cope with real-life difficulties. Child psychologists have found tantalising evidence that imaginary friends provided some sort of mental support to kids who came from disadvantaged backgrounds, were stuck in the US foster care system or were coping with the extreme stresses of war and conflict.
Some studies also suggest that children with imaginary friends have stronger theory of mind – meaning they are better able to understand and relate to the mental states of other people. (c)
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The brain is one of the most energetically expensive organs in the body, accounting for 20 per cent of calories we burn, despite taking up just 2 per cent of our body mass. Curiously, it burns energy like billy-o regardless of what it is doing. (c)
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Daydreaming network
By studying patterns of activity in the default network, neuroscientists think its job is to daydream. That may sound like a mental luxury, but its purpose is deadly serious. It would make the network the ultimate tool for incorporating lessons learned in the past into our plans for the future. (c)
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We are all collections of memories. (c)
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That is what memory researchers are now starting to realise: memory is what allows us to imagine the future.
The first inkling that this may be the case came out of studies of people with a type of amnesia that destroys their autobiographical memories. These people often struggle to make plans, as if being robbed of their past has also robbed them of their future. (c)
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... home truths about our ancestors, who clearly enjoyed sexual liaisons with Neanderthals... (c)
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Most of us have superstitions, even though we know rationally that they cannot work. Yet superstition is not entirely nonsensical. Our brains are designed to detect patterns and order in our environment and to assume that outcomes are caused by preceding events. Both abilities evolved for good reason. Our ancestors would not have lasted long if they had assumed that a rustling bush was caused by the wind rather than a lion. But this survival adaptation leaves us wide open to misattributing effects to causes, such as a football team winning because they’re wearing lucky underpants. In other words, superstition. (c)
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Why do humans have sex in private? ...
Our innate demand for privacy probably evolved in response to our increasingly complex sexual politics. For a start, women won some control from men by evolving concealed ovulation and continual sexual receptivity to confuse paternity. Then our ancestors did something completely different from other great apes – males and females started sharing parental care. Monogamy was born, and along with it the need to strengthen the pair bond. Privacy may have emerged as a way to increase intimacy.
But as well as strengthening relationships, clandestine mating also makes it easier to get away with infidelity. ...
Another very human trait, envy, may also play a part. Since men can never get enough of it, sex is a precious commodity and therefore best enjoyed covertly to avoid inciting covetousness. Like food in a famine, somebody who has plenty would be wise to eat it in private. A sexual act, even among consenting adults, has a high probability of upsetting someone. Parents or community members may disapprove and for children it can lead to the creation of rival siblings. So perhaps clandestine copulation simply follows the precautionary principle. (c)
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Art is a form of intellectual play, allowing us to explore new horizons in a safe environment. (c)
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... language can influence perception.
Greek, for example, has two words for blue – ghalazio for light blue and ble for dark blue. Greek speakers can discriminate shades of blue faster and more accurately than native English speakers.
Language also affects our sense of space and time. For English speakers, time flows from back to front: we ‘cast our minds back’ and ‘hope for good times ahead’. The direction in which our first language is written can also influence our sense of time, with speakers of Mandarin more likely to think of time running from top to bottom than English speakers. Some peoples, like the Guugu Yimithirr in Australia, don’t have words for relative space, like left and right, but do have terms for north, south, east and west. They tend to be unusually skilled at keeping track of where they are in unfamiliar places. (c)
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Language can even shape your memory. Spanish speakers are worse at remembering who caused an accident than English speakers, perhaps because they tend to use passive phrases like ‘Se rompió el florero’ (‘the vase broke’) that do not specify the person behind the event. To a large extent, you are what you speak. (c)
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Thanks to a Maasai tradition known as osotua – literally, umbilical cord – anyone in need can request aid from anyone else. Anyone who’s asked is obliged to help, often by giving livestock, as long as it doesn’t jeopardise their own survival. (c)
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Tribalism and the discord it engenders are frighteningly easy to induce, as social psychologists have long been aware. More than 40 years ago, the late Henri Tajfel showed that dividing a group of strangers into two teams based on arbitrary criteria such as whether they preferred the paintings of Klee or Kandinsky triggered their tribal instincts. Members of the Kandinsky tribe behaved favourably towards team-mates while treating members of the other team harshly, and vice versa. Since then, many experiments have revealed how the flimsiest and most transient badges of identity can trigger people to divide themselves into ‘us’ and ‘them’ – even the colour of T-shirts randomly assigned by psychology researchers can do it. (c)
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Bands of brothers
Our innate tribalism sometimes leads to something called ‘fusion’, where individual identities are subsumed by the group. An effective way to induce this is ritual: synchronised activities, from liturgical recitation to military goose-stepping, seem to make people more likely to follow orders to be aggressive to others.
Rituals that produce shared suffering, pain and fear are especially good at catalysing fusion, which explains the bizarre and often dangerous initiation ceremonies seen in warrior cultures and university drinking clubs. Intense and terrifying shared experiences have a similar effect. During warfare, groups of soldiers often fuse into ‘bands of brothers’ who are willing to die for one another even if they don’t believe in the cause they are fighting for. (c)
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‘Alice laughed. “There’s no use trying,” she said: “one can’t believe impossible things.”
‘“I daresay you haven’t had much practice,” said the Queen. “When I was your age, I always did it for half-an-hour a day. Why, sometimes I’ve believed as many as six impossible things before breakfast.”’ In Lewis Carroll’s day, believing impossible things would more than likely have been seen as a sign of mental imbalance. Today, we know that it is quite normal. Six before breakfast is probably about par for the course. (c)
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The world would be a boring place if we all believed the same things. But it would surely be a better one if we all stopped believing in our beliefs quite so strongly. (c)
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Unenviable choice
It seems then as if we are left with the unattractive choice between a continuous self so far removed from everything constituting us that its absence would scarcely be noticeable, and a self that actually consists of components of our mental life, but contains no constant part we could identify with. (c)
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the temporally extended self, which is an awareness of one’s continuity in time. Insight about this can be found in the case of a man known as N.N., who lost the ability to form long-term memories after he had been in an accident. The damage to his brain also left him without foresight. He described trying to imagine his future as ‘like swimming in the middle of a lake. There is nothing there to hold you up or do anything with.’ In losing his past, N.N. had also lost his future. Brain-imaging studies have since confirmed that the same brain systems that underlie our ability to recall past events also allow us to imagine the future. (c)
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Epigenetic markers are chemical tags added to DNA that alter the activity of genes without altering their genetic sequence. They are added to (and removed from) DNA throughout life in response to environmental factors such as diet, stress and pollution. ...
Of course, epigenetic markers could be seen as being just another form of nurture. But the fact that they are etched onto the genome means they are also nature. Our epigenetic profiles are shaped by the environment, which in turn influences the activity of our genes, which in turn shapes our behaviour, and so on in a complex interplay that blurs the old distinction between nature and nurture. (c)
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Evolved randomness?
Epigenetics may be a way for evolution to hedge its bets. Within our genome, there are hundreds of regions where epigenetic patterns appear totally random – they are neither genetically predetermined (nature) nor set by the environment (nurture), and they vary widely from individual to individual. These regions include many key developmental genes. One possible explanation is that the randomness is an evolved feature. Many animals have to survive in a constantly changing environment. Random epigenetic changes produce lots of variation in genetically similar offspring, increasing the chances that some of them will survive. (c)
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Women most dislike their space being invaded from the side, men from the front...
We survive crowds by dehumanizing those around us. We avoid eye contact, wear blank faces and avoid contact. (c)
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Far from being pathological, though, positive illusions are viewed as being a marker of a healthy mind. The only people who appear immune are those with clinical depression, a state known as ‘depressive realism’. Whether they are realists because they are depressed or depressed because they are realists is not clear. (c)
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...if you want to come across as unflappable, adopt a slow and relaxed gait. (c)
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You probably think you will always be in your mother’s heart, and she in yours. And you’d be right – quite literally. After you were born, you probably left tiny bits of yourself inside your mother. And you got stuff from her, too: her cells take up residence in most of your organs, perhaps even your brain. They live there for years, decades even, meddling with your biology and your health. The same is true of your own children and your brothers and sisters.
Sure, your blood, skin, brain and lungs are made up of your own cells, but not entirely. Most of us are walking, talking patchworks of cells, with emissaries from our mother, children or even our siblings infiltrating every part of our bodies. Welcome to the bizarre world of microchimerism. (c)
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Moving marbles... Embodied cognition... Unconscious climbing... Creative posturing. (c)
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... rationality quotient (RQ) ... RQ also measures ‘risk intelligence’, which defines our ability to assess probability. ... RQ ... depends on something called metacognition, which is the ability to assess the validity of your own knowledge. People with high RQ have acquired strategies that boost this self-awareness. One simple approach is to take your intuitive answer to a problem and consider its opposite before coming to the final decision. This helps you develop keen awareness of what you know and don’t know. (c)
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People who are ignorant about something often display preposterous overconfidence in their own abilities. (c)
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Many researchers who work on the mind–body connection think what really matters is having a sense of purpose in life. Having an idea of why we are here and what is important increases our sense of control over events, rendering them less stressful. One study of a three-month meditation retreat found that the physiological benefits correlated with an increased sense of purpose in life. The participants were already keen meditators, so the study gave them lots of time to do something important to them. Simply doing what you love, whether it’s gardening or voluntary work, might have a similar effect on health. (c)
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...realism can be bad for your health. Optimists recover better from medical procedures such as coronary bypass surgery, have healthier immune systems and live longer. ... Just as helpful as taking a rosy view of the future is having a rosy view of yourself. High ‘self-enhancers’ – people who see themselves in a more positive light than others see them – have lower cardiovascular responses to stress and recover faster, as well as lower baseline cortisol levels.
Whatever your natural disposition, you can train yourself to think more positively, and it seems that the more stressed or pessimistic you are to begin with, the better it will work. (c)
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... a gnawing suspicion that Sir Oliver had been a few envelopes short of a stationery set. (c)
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Many families of HERVs seem to be important in normal brain function....
Taking control
Viral DNA that has infiltrated human eggs and sperm – and so can be passed down the generations – does not only form genes. These HERVs, as they are called ... can also play a role in regulating the expression of other genes. Promoters are DNA sequences that help to activate or repress the expression of genes. Of 2,000 promoters from the human genome, nearly a quarter have been shown to contain viral elements. Even an important protein such as beta-globin, one of the main constituents of the oxygen-carrying molecule haemoglobin, is partly controlled by a retroviral fragment. (c)
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...the median artery is present in human embryos but according to textbooks it normally dwindles and vanishes around the eighth week of pregnancy. An increasing number of adults now have a median artery, up from 10 per cent at the beginning of the twentieth century to 30 per cent at the end. Over the same period, a section of the aorta lost a branch that helps supply the thyroid gland. (c)
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A major component of true friendship is behavioural synchrony – friends must be in the same place at the same time to establish and maintain a relationship. Endorphins seem to promote friendship by making synchrony feel good. (c)
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Falling fertility rates around the globe mean a growing percentage of people are firstborns. We may be heading for a world where fat, stroke-prone, conservatives are in the majority. (c)
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If anyone ever accuses you of getting emotional, you can comfort yourself that emotions push us to act, and without them we’d never get anything done and society wouldn’t function. (c)
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The word nostalgia – from the Greek nostos, to return home, and algos, pain – was coined by medical student Johannes Hofer in 1688, to describe a disorder observed in homesick Swiss mercenaries stationed in Italy and France. Hofer saw nostalgia as a disease whose symptoms included weeping, fainting, fever and heart palpitations. He advised treating it with laxatives or narcotics, bloodletting or – if nothing else worked – by sending the soldiers home. (c)
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humans can be seen as members of an elite club of species in which adulthood has become so long and complicated that it can no longer all be given over to breeding. Just like long-sightedness and inelastic skin, the menopause now appears to be a coordinated, controlled process. Recent research suggests that it is not a meandering, stumbling deterioration but a neatly executed event that is a key part of the developmental programme of middle age. It liberates women and their partners from the unremitting demands of producing children, and gives them time to do what middle-aged people do best – live long and pamper. (c)
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Don’t linger too long
Excessive conscientiousness also gets in the way. Adults are better than children at devising and sticking to practice regimes, but these can backfire. Left to their own devices, most adults segment their sessions into blocks. When learning salsa dancing, for instance, they may work on a specific move until they feel they have mastered it, then move on to another. The approach may bring rapid improvements at first, but a host of studies have found that it is less effective overall.
Instead, you’d do better to take a carousel approach, rotating quickly through the different skills to be practised without lingering too long on each one. Although the reason is unclear, it seems that jumping between skills makes your mind work a little harder when applying what you’ve learned, helping you to retain the knowledge in the long term...(c)
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Dressing up for a date can really pay off. Scientists at Sweden’s Uppsala University took pictures of women wearing three different outfits: a dowdy ensemble, their everyday clothes and their glad rags. The women kept their expressions neutral and only their faces appeared in the photos. Asked to rate the attractiveness of the photos, a panel of men consistently chose pictures of the women in their finery, even though the clothes were not visible. It seems that women unconsciously project feelings about their appearance into their facial expressions. (c)
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So perhaps what parents mistake for hyperactivity at parties is just sugar-fuelled kids concentrating on having fun. (c)