Abstract
The asymmetry of motor symptoms in Parkinson's disease (PD) reflects the asymmetry of the degenerative process and death of nigrostriatal dopaminergic neurons in the substantia nigra, which is confirmed by the data of functional neuroimaging. This review discusses a possible effect of the asymmetry of substantia nigra lesions on other PD symptoms, primarily neuropsychological functions. The authors summarize the data obtained in a comparative analysis of cognitive impairments in PD patients with right-sided and left-sided predominance of motor symptoms. The association between the asymmetry of motor and cognitive symptoms indicates the variability of the profile of cognitive impairments in PD, as well as an important modulating role of subcortical structures on neuropsychological functions traditionally referred to as cortical. The effect of lateralization of symptoms on cognitive function should be considered when evaluating and treating PD patients.
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