Behave: The Biology of Humans at Our Best and Worst

Behave: The Biology of Humans at Our Best and Worst

by Robert M. Sapolsky
4.41 (24K)  •  2017

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Spoiler: The author gives several examples of “incandescent” change in mindset and behavior, both in groups of humans and individuals. He discusses the 1914 Christmas Truce of World War I, for example, when a temporary cease-fire was ordered to allow soldiers to collect and bury bodies. However, it took only a few hours for soldiers from opposing sides to start playing soccer together and building friendships. He says human behavior is fed by so many complex factors that we must be careful when judging others.
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Spoiler: The author says that we are both a phenomenally violent and an amazingly altruistic species. How to make sense of ourselves at our best and worst? He describes several parts of the brain that play into human behavior, including the amygdala, the insular cortex, the dopamine system, and the frontal cortex. He says the frontal cortex is the most recently evolved part of the brain and is the one that helps us do the right thing and the hard thing, postponing gratification when necessary.
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Spoiler: We must be cautious when making moral judgments about the behavior of others. Human behavior is influenced by what happened in the brain a millisecond ago, what happened years before in childhood, what happened in the womb, and what happened millions of years ago when our ancestors formed their culture. To make an informed judgment, we would also have to know what happened about 5 million years ago, when humans and chimpanzees shared their last common ancestor.
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Spoiler: Sapolsky describes several parts of the brain that are relevant to human behavior. One is the insular cortex, which keeps us alive by helping us perceive rotten food as disgusting. The author says that if we even think about eating something disgusting, our insular cortex activates. However, while in every other mammal the insular cortex is about gustatory repulsion, in humans it also activates around moral disgust. Getting large groups of humans to feel this literal stomach-turning disgust towards specific groups of other humans is one thing that leads to genocide.

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Robert M. Sapolsky

Other books by Robert M. Sapolsky

4.18 (15K)   •   1993
4.38 (8K)   •   2001

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