Proceedings of the Annual Meeting of the Cognitive Science Society

The round number effect refers to discontinuity around roundnumbers (“0.300”, “4 hours”) in frequency distribution,indicating that people consider the round numbers as goals orreference points for their performances. This study aimed toexamine the round number effect by exploring the followingtwo issues: (1) examination of Japanese baseball data, and (2)comparison between batters who exceeded the regulationnumber of at-bat of season and those who did not. Resultsindicate the following three points; (1) the round numbereffect was found in Japanese baseball data, (2) but it wasfound only for the batters who exceeded provision bat numberof season, and (3) magnitude of the effect was stronger inJapanese than Major League Baseball data. Generaldiscussion argued these results in terms of players’ motivationand disposition.