Journal article

A test of the magnocellular deficit theory of dyslexia in an adult sample

Geoffrey W Stuart, Ken I McAnally, Adam McKay, Michael Johnston, Anne Castles

COGNITIVE NEUROPSYCHOLOGY | ROUTLEDGE JOURNALS, TAYLOR & FRANCIS LTD | Published : 2006

Abstract

An influential theory of dyslexia is based on the premise that individuals with the disorder have impaired sensitivity to rapidly changing stimuli in the visual and auditory modalities, due to a dysfunction in the magnocellular channel of the visual system and its analogue in the auditory pathway. The deficit in the auditory system is thought to cause difficulties in the segmentation of speech and the formation of accurate phonological representations, leading to problems in making the grapheme-phoneme correspondences necessary for reading. In a sample of 13 adults with a history of severe reading difficulty and 18 controls, visual contrast thresholds were measured in response to an 8-Hz fli..

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