# 從生物學觀點而言,人類被鼓勵要善待彼此,而且當我們這麼做的時候,會得到生理方面的獎勵。一個無私的舉動會觸發腦內啡的釋放,這種神經傳送物有助於阻斷疼痛和產生欣快感。利他的行為和激烈的運動一樣能讓人興高采烈,這種效果有時稱作「助人者的快感」——《失控的努力文化》
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