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Chapter 3 discusses some unsettling research-stick your average person in a brain scanner, and show him a picture of someone of another race for only a tenth of a second. This is too fast for him to be aware of what he saw. But thanks to that anatomical shortcut, the amygdala knows . . . and activates. In contrast, show the picture for a longer time. Again the amygdala activates, but then the cognitive dlPFC does as well, inhibiting the amygdala-the effort to control what is for most people an unpalatable initial response.

( Robert M. Sapolsky )
[ Behave: The Biology of Humans ]
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