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"A recent study of eighteen rhesus monkeys provides clues as to the effects of birth order on an individual's levels of stimulation. 出生顺序对个体刺激水平的影响The study showed that in stimulating situations (such as an encounter with an unfamiliar monkey), firstborn infant monkeys produce up to twice as much of the hormone cortisol, which primes the body for increased activity levels, as do their younger siblings.第一个出生的比那些小一些的………… Firstborn humans also produce relatively high levels of cortisol in stimulating situations (such as the return of a parent after an absence). The study also found that during pregnancy, first-time mother monkeys had higher levels of cortisol than did those who had had several offspring."
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