Fred J Marshall

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We examined the frequency of Parkinson disease with mild cognitive impairment (PD-MCI) and its subtypes and the accuracy of 3 cognitive scales for detecting PD-MCI using the new criteria for PD-MCI proposed by the Movement Disorders Society. Nondemented patients with Parkinson's disease completed a clinical visit with the 3 screening tests followed 1 to 3(More)
Rigidity, slowness, gait impairment, and other disorders of movement accompany Alzheimer's disease (AD) at various stages of the illness. The presence of these so-called extrapyramidal features have been reported to predict disease prognosis and pathologic localization. Unfortunately, failure to accurately characterize the movement disorder, particularly to(More)
The distortion of polar perspective depends on the depth of the tridimensional shape and on the observation distance. In four experiments using 54 undergraduates as subjects, we found that a compensation process which takes depth and observation distance into account corrects for such distortions. Compensation was demonstrated in experiments in which(More)
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