# 二○一○年,阿姆斯特丹大學的研究者發現,催產素的效果看起來僅局限於自己的團體。[2]激素不只增進對朋友的愛,也會強化對陌生人的反感。到頭來發現,催產素並不會激起普世情誼。它會驅動「自己人優先」的感受。——《人慈》
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