An investigation of cognitive dysmetria in developmental dyslexia
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Shanagher L M, Elliott M A, 2006, "An investigation of cognitive dysmetria in developmental dyslexia" Perception 35 ECVP Abstract Supplement
An alternative to theories positing visual or phonological deficits, the 'cognitive dysmetria' hypothesis proposes the aetiology of dyslexia to take the form of a general functional coordination deficit or cognitive dysmetria. The term 'dysmetria' describes a general impairment in the temporal correlation of brain activity. The purpose of the current research was to investigate the empirical basis for this idea in an experimental task designed to measure simultaneity thresholds. Twenty children diagnosed with developmental dyslexia, alongside twenty age and IQ matched controls, undertook a series of threshold determination procedures designed to measure the location of simultaneity thresholds in time and the influence of subthreshold synchrony upon perceived simultaneity. The results are discussed with reference to local, visual impairments their relation to a more global dysmetria, and its potential implications for developmental dyslexia.