One early explanation for the large brain involved bananas and other calorie-rich fruits. Animals that graze on grass don’t need to do a lot of thinking about where to find their next meal. But a tree that had perfectly ripe bananas a week ago may be picked clean today or may have only unappealing, squishy brown fruits left. A banana eater needs a bigger brain to remember where the ripe stuff is, and the brain could be powered by all the calories in the bananas, so the “fruit-seeking brain theory” made lots of sense—but only in theory. The anthropologist Robin Dunbar found no support for it when he surveyed the brains and diets of different animals. Brain size did not correlate with the type of food. Dunbar eventually concluded that the large brain did not evolve to deal with the physical environment, but rather with something even more crucial to survival: social life. Animals with bigger brains had larger and more complex social networks. That suggested a new way to understand Homo sapiens. Humans are the primates who have the largest frontal lobes because we have the largest social groups, and that’s apparently why we have the most need for self-control. We tend to think of willpower as a force for personal betterment—adhering to a diet, getting work done on time, going out to jog, quitting smoking—but that’s probably not the primary reason it evolved so fully in our ancestors. Primates are social beings who have to control themselves in order to get along with the rest of the group. They depend on one another for the food they need to survive. When the food is shared, often it’s the biggest and strongest male who gets first choice in what to eat, with the others waiting their turn according to status. For animals to survive in such a group without getting beaten up, they must restrain their urge to eat immediately. Chimpanzees and monkeys couldn’t get through meals peacefully if they had squirrel-sized brains. They might expend more calories in fighting than they’d consume at the meal.
Although other primates have the mental power to exhibit some rudimentary etiquette at dinner, their self-control is still quite puny by human standards. Experts surmise that the smartest nonhuman primates can mentally project perhaps twenty minutes into the future—long enough to let the alpha male eat, but not long enough for much planning beyond dinner. (Some animals, like squirrels, instinctively bury food and retrieve it later, but these are programmed behaviors, not conscious savings plans.) In one experiment, when monkeys were fed only once a day, at noon, they never learned to save food for the future. Even though they could take as much as they wanted during the noon feeding, they would simply eat their fill, either ignoring the rest or wasting it by getting into food fights with one another. They’d wake up famished every morning because it never occurred to them to stash some of their lunch away for an evening snack or breakfast.
Humans know better thanks to the large brain that developed in our Homo ancestors two million years ago. Much of self-control operates unconsciously. At a business lunch, you don’t have to consciously restrain yourself from eating meat off your boss’s plate. Your unconscious brain continuously helps you avoid social disaster, and it operates in so many subtly powerful ways that some psychologists have come to view it as the real boss. This infatuation with unconscious processes stems from a fundamental mistake made by researchers who keep slicing behavior into thinner and briefer units, identifying reactions that occur too quickly for the conscious mind to be directing. If you look at the cause of some movement in a time frame measured in milliseconds, the immediate cause will be the firing of some nerve cells that connect the brain to the muscles. There is no consciousness in that process. Nobody is aware of nerve cells firing. But the will is to be found in connecting units across time. Will involves treating the current situation as part of a general pattern. Smoking one cigarette will not jeopardize your health. Taking heroin once will not make you addicted. One piece of cake won’t make you fat, and skipping one assignment won’t ruin your career. But in order to stay healthy and employed, you must treat (almost) every episode as a reflection of the general need to resist these temptations. That’s where conscious self-control comes in, and that’s why it makes the difference between success and failure in just about every aspect of life.
~~Willpower- Rediscovering The Greatest Human Strength -by-Roy F. Baumeister and John Tierney
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