Sakaguchi, S., Kobayashi, H., Hashiya, K. (2009, Oct. 1-3). The direct gaze as a positive reinforcer for 6-7-month-old infants. Joint Attention: Developments in Philosophy of Mind, Developmental and Comparative Psychology, and Cognitive Science., Bentley University, Greater Boston, USA.

Kusumoto, H. (2009, Dec. 19-20). Communitive behavior reflecting the perception of other's cognitive environment in infancy. Symposium of Cooperative Reseach Program 2009: 5th International Inuyama Comparative Sicial Cognition Symposium (iCS2:5) Primate Reseach Institute, Kyoto University, Inuyama, Japan.

Sakurai, G. & Hashiya, K. (2008, June). Sex difference in preference for similar speech pattern in humans and its adaptive function. Human Behavior and Evolution Society. 20th. Annual Conference, Kyoto.

Kobayashi, H., Nobuyoshi, N., Kiriyama, Y., Hashiya, K. (2008, June). Spontaneous regulation of the synchlonized actions with humans by a chimpanzee. Human Behavior and Evolution Society 20th. Annual Conference, Kyoto.

Murakami T, Hashiya K, Ohgami H (2008, July) The Development of Social Cognition in 9- to 81-month-old. International Society for the Study of Behavioral Development. 20th Bienniel Meeting, Congress Center Wurzburg.

Hashiya, K. & Kobayashi, H. (2008, June). Typical development in the response to being imitated by others in childhood: A way to find "others' intention. Human Behavior and Evolution Society 20th. Annual Conference, Kyoto.

Matsushima, N. & Hashiya, K. (2008, July). How Do 3- to 6-year-olds Respond to Irrational Events? International Society for the Study of Behavioral Development. 20th Bienniel Meeting. Congress Center Wurzburg.

Matsushima, N. (2007). Developmental change in response to the irrational event in 3-6 year-olds. 13th European Conference of Developmental Psychology, Friedrich Schiller University of Jena.

Matsushima, N. (2006). Cognitive development of rational and irrational causality in childhood: The influence of information from others. XVth Biennial International Conference on Infant Studies, Westin Miyako Hotel.

Hisazaki, T., Matsushima, N., Kuroki, M. (2006). Development of reasoning about other’s desires; modification of the food-request procedure. XVth Biennial International Conference on Infant Studies, Westin Miyako Hotel.

Morimoto, R. & Hashiya, K. (2005). Memory for Faces in Infants: A Comparison to the Memory for Objects. Development and Learning, The 4nd International Conference, Osaka.

Matsushuma, N. (2005). Cognitive development of irrational causality in childhood; The influence of information from others. The 3rd International Workshop for Young Psychologists, Kyoto University.