Aphasia: Sudden and Progressive

M. M. Mesulam*

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingChapter

1 Scopus citations


An acquired disorder of language is known as aphasia (or dysphasia). Symptoms can include impairments of object naming, word finding, syntax, and comprehension. Some patients have a sparse, labored output; others have unusually voluminous but uninformative speech. The nature of the aphasia varies from patient to patient and reflects the principal lesion site within a distributed left-hemisphere language network. Aphasia can start suddenly when caused by cerebrovascular accidents or progresses relentlessly when caused by neurodegeneration. A neurodegenerative disease that selectively impairs language is known as primary progressive aphasia.

Original languageEnglish (US)
Title of host publicationEncyclopedia of Neuroscience
PublisherElsevier Ltd
Number of pages5
ISBN (Print)9780080450469
StatePublished - Jan 1 2009


ASJC Scopus subject areas

  • Neuroscience(all)

Cite this

Mesulam, M. M. (2009). Aphasia: Sudden and Progressive. In Encyclopedia of Neuroscience (pp. 517-521). Elsevier Ltd. https://doi.org/10.1016/B978-008045046-9.00550-7