A study of recovery from aphasia using factor analysis

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  • 失語症の言語治療効果に関する因子分析研究

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  To ascertain the primary recovery mechanism in speech therapy, we applied factor analysis to the im provement scores for 26 subtest items on the Standard Language Test of Aphasia (SLTA) of 267 aphasic patients. The improvement score was defined the difference between the subtest score at the beginning of speech therapy and at the second evaluation. Our factor analysis extracted six improvement factors, none of which was considered as corresponding to so-called general factor. Factor 1 was determined as represent ing “non-converting” language production and complex language information processing. Each one of Fac tors 2-6 was identified primarily by a particular modality, leading us to presume that Factor 2-6 represent modality converting faculties or relatively simple language information processing faculties. As Factor 1 appears to embody the entirely of the human language function and to manage symbols creatively and independently, we recognized this Factor as “the core factor of improvement in a recovery from aphasia”. <br>   We could consider the improvement of Factor 1 as essential in speech therapy for aphasic patients, and if we interpret this according to “logogen model”, in the language mechanism of the person who had the core semantic system, the improvement of voluntary output from the semantic system and capacity for complex information processing in the semantic system were essential.

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