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Touching heads : ウィキペディア英語版 | Touching heads
Touching heads is a uniquely human emotional expression that does not occur in nonhuman primates. All races, age groups and both sexes of humankind interpret this behavior as an expression of positive emotions, such as love—including brotherly love, friendship etc. It is absent in apes, though they tend to use the same bodily expressions of emotions like humans.〔Darwin Charles (1998) ''The Expression of the Emotions in Man and Animals'', 3rd edn, London: Harper Collins.〕 A 2012 study claimed that this behavior likely evolved in humans to share head lice among friends and relatives. Head lice infestations might serve as a protection against body lice by inducing cross-resistance. This can be adaptive because only the latter type of lice transmit potentially lethal human pathogens. ==References==
抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)』 ■ウィキペディアで「Touching heads」の詳細全文を読む
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