Ideational fluency in Parkinson's disease

Abstract Recent research on Parkinson's disease (PD) suggests that executive functions are impaired but that visuospatial functions may be spared. This dissociation has been attributed to dysfunction in ascending dopaminergic pathways affecting the prefrontal cortex. We investigated these ideas in a sample of intellectually intact patients with idiopathic, optimally treated PD ( N = 20) and in spouse controls ( N = 15); the groups were divided into young (age p = .01). An age-related deficit was seen on the spatial factor ( p p