Objective: To examine the efficacy of cognitive speed of processing training (SOPT) among individuals with Parkinson disease (PD). Moderators of SOPT were also examined.Methods: Eighty-seven adults, 40 years of age or older, with a diagnosis of idiopathic PD in Hoehn & Yahr stages 1-3 and on a stable medication regimen were randomized to either 20 hours of selfadministered SOPT (using InSight software) or a no-contact control condition. Participants were assessed at baseline and after 3 months of training (or an equivalent delay). The primary outcome measure was useful field of view test (UFOV) performance, and secondary outcomes included cognitive self-perceptions and depressive symptoms. Cognitive dysfunction in Parkinson disease (PD) 1 is associated with poorer prognosis and reduced quality of life (e.g., loss of independence due to driving impairments 2 ). Reduced speed of processing 3,4 and poor visual attention (as indexed by useful field of view [UFOV]) 5 are important aspects of cognitive decline in PD. UFOV difficulties in PD predict impaired driving performance [6][7][8] and are associated with higher risk of driving cessation. 2 Previous studies in aging have demonstrated that cognitive speed of processing training (SOPT) enhances UFOV performance, 9-12 and transfers to improved performance of instrumental activities of daily living, including driving mobility and safety. 10,[13][14][15] Few clinical trials have examined nonpharmacologic cognitive interventions among persons with PD 16,17 despite evidence that such techniques enhance cognition among older adults. We present the first study to utilize SOPT among persons with PD.The primary study aim was to examine the efficacy of SOPT among individuals with PD. We hypothesized that individuals with PD randomized to SOPT would experience enhanced From the School of Aging Studies (J.D.E., E
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