{"_buckets": {"deposit": "bf67f1d1-ebd5-44b7-bd7e-64b5736bc6aa"}, "_deposit": {"created_by": 24, "id": "5926", "owners": [24], "pid": {"revision_id": 0, "type": "depid", "value": "5926"}, "status": "published"}, "_oai": {"id": "oai:ir.soken.ac.jp:00005926", "sets": ["34"]}, "author_link": ["10752", "10751"], "item_2_creator_3": {"attribute_name": "著者名(英)", "attribute_type": "creator", "attribute_value_mlt": [{"creatorNames": [{"creatorName": "OHTSUKI, Hisashi", "creatorNameLang": "en"}], "nameIdentifiers": [{"nameIdentifier": "10752", "nameIdentifierScheme": "WEKO"}]}]}, "item_2_date_4": {"attribute_name": "発行日", "attribute_value_mlt": [{"subitem_date_issued_datetime": "2019-04-01", "subitem_date_issued_type": "Created"}]}, "item_2_description_13": {"attribute_name": "研究課題番号", "attribute_value_mlt": [{"subitem_description": "50517802", "subitem_description_type": "Other"}]}, "item_2_description_14": {"attribute_name": "フォーマット", "attribute_value_mlt": [{"subitem_description": "application/pdf", "subitem_description_type": "Other"}]}, "item_2_description_16": {"attribute_name": "研究期間", "attribute_value_mlt": [{"subitem_description": "2013～2017", "subitem_description_type": "Other"}]}, "item_2_description_17": {"attribute_name": "抄録", "attribute_value_mlt": [{"subitem_description": "研究成果の概要（和文）：個体から個体へと恐怖や痛み等の負の情動が伝わる「情動伝染」が進化する条件は、当該個体間が似通った環境を共有する場合であり、個体間の血縁の大小とは関係が薄いことを見出した。また情動伝染の進化はグループサイズの増大に先んじて起きたという理論的予測を得た。「他者に協力されたから自分も第三者に協力する」という正の共感性に基づく協力は、そのような情動状態が長続きしないいわば「冷めやすい共感性」である時に限って適応進化可能であることが分かった。またヒトの持つ同調性は、時として集合知の劣化をもたらすが、向社会性を促進し得ることを見出した。\n\n研究成果の概要（英文）：Negative emotional contagion, which means the contagion of negative emotions such as fear or pain between individuals, can evolve by natural selection if those individuals share similar environments. In contrast, the effect of their genetic similarity on its evolution is marginal. I have also obtained a theoretical prediction that the evolution of emotional contagion should have occurred before the expansion of group size in group-living animals. Reciprocal cooperation based on positive empathy, such as “I will cooperate with a third party because I received help from someone”, can evolve only if such a positive emotional state lasts for a limited period of time. 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