Attentional gating in primary visual cortex: a physiological basis for dyslexia.

Trichur R Vidyasagar; (2005) Attentional gating in primary visual cortex: a physiological basis for dyslexia. Perception, 34 (8). pp. 903-911. ISSN 0301-0066 DOI: 10.1068/p5332
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The visual magnocellular pathway is known to play a central part in visuospatial attention and in directing attention to specific parts of the visual world in serial search. It is proposed that, in the case of reading, this mechanism is trained to perform a sequential gating of visual information coming into the primary visual cortex to enable further orderly processing by the ventral stream. This scheme, taken together with the potential for plasticity between the different afferent channels in the case of a relative impairment of the magnocellular system, can provide some limited rationale for the beneficial effects that have been claimed for the use of coloured overlays and glasses.

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