标题:816 精神薄弱児の移行性(Shifting)III : 特に失敗場面の影響について(21.精神薄弱(2),日本教育心理学会第5回総会部門別研究発表要旨・討論の概要) [in Japanese] 816 Shifting of mental deficiency (III) : effects of failure situations(21.Mental deficienty (2),PROCEEDINGS OF THE FIFTH ANNUAL CONVENTION OF JAPANESE ASSOCIATION OF EDUCATIONAL PSYCHOLOGY PAPERS AND THE SUMMARIES OF DISCUSSIONS) [in Japanese]