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aphasia (loss of speech)
A loss of the ability to produce and/or comprehend language, due to injury to brain areas specialized for these functions, Broca's area, which governs language production, or Wernicke's area, which governs the interpretation of language. (source: Wikipedia)
pathological speech disorder
(pathology) A partial or total loss of language skills due to brain damage. Usually, damage to the left perisylvian region, including Broca's area and Wernike's area, causes aphasia.