Abstract

Parkinson's disease, the most common progressive neurological movement disorder worldwide, causes slow deterioration of subcortical structures and dopamine deficiency, and the disruption of circuits connecting frontal lobe and basal ganglia regions. Although the motor and cognitive consequences of these structural and physiological changes have been well-documented, only a limited, albeit growing, empirical literature has examined the integrity of language abilities in individuals with Parkinson's disease. This article reviews recent advances in that literature that have furthered our understanding of the quantitative and qualitative changes in morphosyntactic, lexical-semantic, and discourse levels of language functioning associated with Parkinson's disease. This article also discusses the theoretical and applied implications of these linguistic symptoms and provides suggestions to forward this line of research.

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