Abstract
Sign language can be disrupted by brain damage due to stroke, trauma, or disease. Problems with sign language can occur at the level of phonetics, phonology, morphology, syntax, semantics, or discourse. Even though sign language is quite different from spoken language in how it is produced (hands instead of voice) and perceived (vision instead of hearing), brain damage affects it in ways similar to spoken language. Parkinson's disease causes disorders at the level of phonetics; left hemisphere brain damage causes disorders in phonology, morphology, syntax, and semantics; and right hemisphere brain damage causes disorders at the level of discourse.
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