Abstract and Keywords
This chapter explores the elicited production of regular, irregular, and semi-regular inflected verb forms by patients with neurocognitive disorders. Patients with similar profiles of neurological damage and cognitive dysfunction also exhibit similar language deficits. In one profile, dysfunction of semantic memory and damage to temporal lobe brain structures correspond to a deficit at producing irregular and other memory-dependent inflected forms. Alzheimer’s disease, Semantic dementia, Herpes Simplex Encephalitis, and Williams syndrome fall into this first pattern. In patients with a different profile, motor dysfunction and damage to frontal/basal-ganglia circuits corresponds to abnormal production of regular affixed forms, though retrieval deficits affecting production of irregular forms can also be found. This pattern encompasses (at least) Parkinson’s disease, Huntington’s disease, Tourette’s syndrome, autism, and schizophrenia. Both patterns hold cross-linguistically, across (at least) English, Italian, Greek, French, and German, and are discussed in light of diverse neurocognitive perspectives of morphology and language.
Keywords: regular vs. irregular, elicited production, verb, disorder, disease, temporal lobe, semantic memory, frontal/basal-ganglia circuits, procedural memory, motor function, cross-linguistic comparisons
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