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  サイトウ アツコ
  齋藤 慈子   教育学部 児童教育学科   講師
■ 標題
  Passersby attracted by infants and mothers' acceptance of their approaches: A proximate factor for human cooperative breeding
■ 概要
  Humans have engaged in unique cooperative breeding as multiple in-group members help mothers.Two psychological-proximate factors maintain such a breeding system-various individuals'interest in infats and mothers' positive reactions toward individuals approaching their infants. In Study 1, we conducted field observations to examine the first factor: what types of passersby in Japan reacted to the mother and infant.There were differences among age groups in frequency of looking at mother and infant with the rise in older adults. The sex difference was not significant. In Study 2, we gathered data using hypothetical scenarios to investigate the second factor: how mothers felt when their infants were approached by strangers. Mothers received strangers' approaches positively. The present study showed that humans engaged in cooperative breeding in the Environment of Evolutionary Adaptedness (EEA), where mothers in modern society see strangers as potential helpers as part of the EEA.
  Nishiyama, K., Oishi, K., Saito, A.
  共著   Evolutionary Psychology   13(2),pp.470-491   2015/06