New research has argued that dyslexia may result from impair­ment of a dif­ferent lin­guistic system than pre­vi­ously thought. Speech per­cep­tion engages at least two lin­guistic sys­tems: the pho­netic system, which extracts dis­crete sound units from acoustic input, and the phono­log­ical system, which com­bines these units to form indi­vidual words.

Pre­vi­ously, researchers gen­er­ally believed that dyslexia was caused by phono­log­ical impair­ment, but results from the cur­rent study, led by Iris Berent of North­eastern Uni­ver­sity in Boston, sug­gest that the pho­netic system may actu­ally be the cause.

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