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From this literature a general pattern of cognitive domains that are more likely to be impaired in patients with PD has been identified. These include visuoperception/ visuospatial ability, speed of mental processing, memory, learning, and executive functions (including, planning, working memory, verbal fl uency, and attention). Impairments in some areas of functioning, particularly executive functions, are evident even from the early stages of the disease and may predict the onset of dementia (Cooper,doi:10.1017/s1355617709991299 pmid:20003582 fatcat:p3gesunznjelvpsszmtqzhfnym