About Yuichi Hattori

Yuichi Hattori, MA

Sayama Psychological Institute

Yuichi Hattori is a psychologist in private practice in Sayama City, Saitama, Japan.

He also resides in Los Angeles, California. His alternating residences between Japan and the US have been contributing to his cross-cultural perspectives of hikikomori.

Yuichi Hattori specializes in Dissociative Identity Disorder (formally called “multiple personality disorder”) and hikikomori.

He lectured the classes of introductory psychology, multiple personality, and mind control techniques of cults at Science University of Tokyo from 1993 to 2001.

He gained MA and BA in psychology from California State University, Los Angeles.

English Publications

  • Social Withdrawal in Japanese Youth: A Case Study of Thirty-Five Hikikomori Clients. Co-published simultaneously in Journal of Trauma Practice. Vol. 4, No. 3/4, 2005, pp. 181-201; and: Trauma and Dissociation in a Cross-Cultural Perspective: Not Just a North American Phenomenon. 2005. pp. 181-201. The Haworth Maltreatment & Trauma Press.
  • The article is available online at http://www.tandfonline.com/

Japanese Publications

  • Tajyu Jinkaku “Multiple Personality Disorder” 1995, PHP Institute
  • Translation of Osiris Complex by Colin A. Ross. PHP Institute. 1996.
  • Tajyuu Jinkakusha no Shinjitsu “The Reality of Clients with Multiple Personality Disorder.” Kodansha, 1998.
  • Hikikomori to Kazoku Torauma “Hikikomori and Familial Trauma.” NHK Publisher. 2005.Hattori, Y. (2005).