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The aim of this study was to examine the development of some psychological characteristics in 33 autistic persons, of both sexes, over a 15-year interval, specifically from 1987 to 2002. The variables assessed were: social interaction, language, and repetitive and stereotyped behaviors, in order to determine which behaviors improved, which became worse, and which remained stable in these individuals. The results reveal that the subjects experienced both positive and negative changes, as well as some stability in certain behaviors of the three domains under study. Important educational and clinical implications can be inferred from these data.
