What causes dyslexia?: comment on Goswami.

نویسنده

Mark S Seidenberg

چکیده

Finding an underlying deficit that links the disparate impairments associated with dyslexia would be major breakthrough. In a recent article in TiCS, Goswami [1] offers a viable candidate for such a deficit – and has done a remarkable job of finding links that are plausible if still mostly circumstantial. Her stimulating article raises numerous directions for future research. The epidemiology of dyslexia is poorly documented. Although many deficits have been reported [2], how often they occur and co-occur at different ages in different languages is still unknown. Goswami’s descriptions of what is found in dyslexia should be read as what was found in some studies. More facts are needed; for example, with respect to the greater sensitivity of dyslexics to allophonic variation (which is crucial to Goswami’s account of phoneme-level (iii) Anomalies in the migration of GABAergic (inhibitory) interneuronsmayunderlie a variety of developmental disorders. Such anomalies can be regional rather than global [7]. (iv) GABAergic interneuron pathology impairs lateral inhibition, affecting discrimination of competing types of sensory information [8]. (v) Auditory processing at multiple time and frequency scales in parallel requires resolution of such competing information, and similarly for vision. (vi) For some unknown reason, the processing of lower temporal frequency auditory information is particularly vulnerable, (vii) From which deficits on tasks that rely on this information follow. Update

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