Research Interests

• Social psychology (interpersonal communication, group perception)
• Social network analysis (social capital, longitudinal network development)
• Computer-mediated communication (Internet, mobile phones)
• Cultural psychology.(network formation/maintenance) 

Professional Memberships

• Society for Personality and Social Psychology
• Asian Association of Social Psychology
• Japanese Psychological Association
• Japanese Society of Social Psychology
• Japanese Group Dynamics Association 

Projects

2004-2005. "Text-Messaging Addiction among Youth: A Cognitive-Behavior approach."
Japanese Electronic Communication Dissemination Foundation.
(with Toshikazu Yoshida, Jiro Takai, and Tadahiro Motoyoshi)

2003-2006. “The Impact of the Internet on Social Life.”
Japan Society for the Promotion of Science.

 Publications

1. Igarashi, T., Takai, J., & Yoshida, T. (2005). Gender differences in social network development via mobile phone text messages: A longitudinal study.. Journal of Social and Personal Relationships, 22(5), 691-713.
   
   
2. Igarashi, T. & Yoshida, T. (2003). The effect of the use of mobile phone text messages on freshmen's loneliness during the transition to college. Japanese Journal of Psychology, 74, 379-385. (in Japanese with English abstract)
   
   
3. Igarashi, T. (2002). The effect of social skills on loneliness through mediation of CMC social networks. Japanese Journal of Social Psychology, 17, 97-108. (in Japanese with English abstract)

Conference Presentations

1. Igarashi, T., Yoshida, T. Robins, G.., & Wang, P. (2006, January). Social selection processes in face-to-face and text message-mediated social networks: A structural approach. Poster presented at the seventh conference of the Society for Personality and Social Psychology, Palm Springs, California. (accepted).
   
   
2. Igarashi, T., Motoyoshi, T., Takai, J., & Yoshida, T. (2005, April). The text messaging addiction scale: Factor structure, reliability, and validity. Paper presented at the sixth biennial conference of the Asian Association of Social Psychology, Wellington, New Zealand.
   
   
3. Igarashi, T. & Yoshida, T. (2005, April). Structural interaction between face-to-face and mobile phone text message-mediated social networks. Poster presented at the sixth biennial conference of the Asian Association of Social Psychology, Wellington, New Zealand.
   
   
4. Igarashi, T. (2004, August). Response styles of mobile phone text messages: Effects of gender and message contents. Poster presented at the 28th International Congress of Psychology, Beijing, China.
   
   
5. Igarashi, T. & Yoshida, T. (2004, January). The impact of face-to-face and mobile phone text message communication on social network development: Longitudinal changes in network size and intimacy. Poster presented at the Fifth Conference of the Society for Personality and Social Psychology, Austin, Texas.
   
   
6. Igarashi, T. (2003, July). Longitudinal changes in social network structure of face-to-face and mobile phone text messages: Focusing on gender differences. Poster presented at the Fifth biennial conference of the Asian Association of Social Psychology, Manila, Philippines.