Quiet: The Power of Introverts in a World That Can't Stop Talking by Susan CainMy rating: 3 of 5 stars
Jerome Kagan Galen's Prophecy: Temperament In Human Nature
Kagan has given us painstakingly documented evidence that high reactivity is one biological basis of introversion (we'll explore another likely route in chapter 7), but his findings are powerful in part because they confirm what we've sensed all along. Some of Kagan's studies even venture into the realm of cultural myth. For example, he believes, based on his data, that high reactivity is associated with physical traits such as blue eyes, allergies, and hay fever, and that high-reactive men are more likely than others to have a thin body and narrow face. Such conclusions are speculative and call to mind the nineteenth-century practice of divining a man's soul from the shape of his skull. But whether or not they turn out to be accurate, it's interesting that these are just the physical characteristics we give fictional characters when we want to suggest that they're quiet, introverted, cerebral. It's as if these physiological tendencies are buried deep in our cultural unconscious.
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