Theories and facts of evolutionary psychology with special reference to reasoning and sex difference studies.

1)介绍进化心理学的理论：我们写了几篇关于进化心理学最新趋势的评论文章。我们还组织在互联网上开放邮件列表，每月定期召开一次关于人类行为和进化的会议。2)推理研究：利用沃森选择任务（watson Selection Task）进行了多个推理实验，探讨合作群体中搭便车行为的检测机制。第130次对六年级小学生和大学生进行了“搭便车”现象的调查。3)认知性别差异研究：我们撰写了多篇将性选择理论与认知性别差异联系起来的理论论文。对性嫉妒、情感爱情、心理旋转和特殊记忆进行了实证研究和实验。4)杀人研究：我们基于进化论分析了日本近40年的杀人数据，发现日本年轻男性的杀人率急剧下降，杀婴率异常高。

1) Introducing of the theories of evolutionary psychology : We wrote several review articles about recent trends in evolutionary psychology. We also organized to open a mailing list in internet and to hold monthly regular meeting about human behavior and evolution.2) Reasoning studies : We conducted several reasoning experiments using Wason Selection Task in order to investigate free-rider detection mechanism in cooperative group. 130th six grade pupils and undergraduates checked the existence of free-rider on sharing the problem.3) Cognitive sex difference studies : We wrote several theoretical paper which link sexual selection theory and cognitive sex differences. Empirical researches and experiments were conducted on sexual jealousy, emotional love, mental rotation and special memory.4) Homicide studies : We analyzed Japanese homicide data of last 40 years based on evolutionary theories and found drastic decrease in homicide rate among young males as well as the exceptional high rate of infanticide in Japan.