Sensory Dominance in Normal and Backward Readers

Abstract

32 children (10 normal readers, 10 non-resistant backward readers, and 12 resistant backward readers) were examined for visual and kinaesthetic sensitivity, as measured by a difference-threshold procedure. Birch's hypothesis that the failure of the visual system to be dominant in sensory systems may lead to reading difficulties was tested. To verify this hypothesis the rank-differences, S's visual minus his kinaesthetic threshold rank, should be larger in backward than in normal readers. Results support the hypothesis In addition, it appeared that the dyslectics differ from normal readers not so much by greater kinaesthetic as by lower visual sensitivity. The existence of a smaller visual dominance in dyslectics may be responsible for kinaesthetic interference in the visual information process in reading.