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  1. Intergroup conflicts in human evolution: A critical review of the parochial altruism model(人間進化における集団間紛争 ―偏狭な利他性モデルを中心に―).Hisashi Nakao, Kohei Tamura & Tomomi Nakagawa - 2023 - Japanese Psychological Review 65 (2):119-134.
    The evolution of altruism in human societies has been intensively investigated in social and natural sciences. A widely acknowledged recent idea is the “parochial altruism model,” which suggests that inter- group hostility and intragroup altruism can coevolve through lethal intergroup conflicts. The current article critically examines this idea by reviewing research relevant to intergroup conflicts in human evolutionary history from evolutionary biology, psychology, cultural anthropology, and archaeology. After a brief intro- duction, section 2 illustrates the mathematical model of parochial altruism (...)
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  • Cultural Identity and Intergroup Conflicts: Testing Parochial Altruism Model via Archaeological Data.Hisashi Nakao - 2023 - Annals of the Japan Association for Philosophy of Science 32:75-87.
    The present research used archaeological data, i.e., the data obtained from kamekan jar burials in the Mikuni Hills of the northern Kyushu area in the Mid- dle Yayoi period, to test the parochial altruism model. This model argued that out-group hate and in-group favor coevolved via prehistoric intergroup conflicts. If this model is accurate, such an out-group hate and in-group favor could be re- flected in the archaeological remains, such as pottery making; the more frequent intergroup conflicts are and the (...)
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  • Population pressure and prehistoric violence in the Yayoi period of Japan.Tomomi Nakagawa, Kohei Tamura, Yuji Yamaguchi, Naoko Matsumoto, Takehiko Matsugi & Hisashi Nakao - 2021 - Journal of Archaeological Science 132:105420.
    The causes of prehistoric inter-group violence have been a subject of long-standing debate in archaeology, an- thropology, and other disciplines. Although population pressure has been considered as a major factor, due to the lack of available prehistoric data, few studies have directly examined its effect so far. In the present study, we used data on skeletal remains from the middle Yayoi period of the Japanese archipelago, where archaeologists argued that an increase of inter-group violence in this period could be explained (...)
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  • Violence and climate change in the Jomon period, Japan.Hisashi Nakao - 2020 - In Gwen Robbins Schug (ed.), The Routledge Handbook of the Bioarchaeology of Climate and Environmental Change. New York: