Considering speech production first, this action takes place in two steps. ... The first indication of such a distinction is in the adjacent superior temporal sulcus, but no lexical-semantic info is processed here. ... Whereas posterior aphasia results in an extremely compromised ability to extract the meaning of language, these aphasics cannot process semantics, affecting writing ability as well. The double dissociation between the anterior areas needed for speech output and syntactic processing, and the posterior areas needed for speech comprehension and semantic processing prove that the ...

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• Grade Level: Graduate