标题:803 精神薄弱児の言語とコミュニケーション(19) : コミュニケーションによる態度の変化(20.精神薄弱(1),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] 803 Language and communication in the mentally retarded (19) : Changes of attitude through communication(20.Mental deficienty (1),PROCEEDINGS OF THE FIFTH ANNUAL CONVENTION OF JAPANESE ASSOCIATION OF EDUCATIONAL PSYCHOLOGY PAPERS AND THE SUMMARIES OF DISCUSSIONS) [in Japanese]