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Primary progressive aphasia is an atypical dementia in which language abilities deteriorate while memory is relatively preserved. For many years, the principal signs and symptoms may be confined to the area of language. Patients may come to medical attention because of the onset of word-finding difficulties, abnormal speech patterns, or prominent errors in spelling. Neuropsychological testing can help establish the correct diagnosis.
M.‐Marsel Mesulam (Wed,) studied this question.