Increasing Contrast Improves Object Perception in Parkinson's Disease with Visual Hallucinations.

ABSTRACT:

Background

Deficits in basic vision are associated with visual hallucinations in Parkinson's disease. Of particular interest is contrast sensitivity loss in this disorder and its effect on object identification.

Objectives

Evaluate whether increased contrast improves object perception in persons with Parkinson's disease and visual hallucinations, without dementia.

Methods

We assessed 26 individuals with mild to moderate idiopathic Parkinson's disease, half of whom reported one or more episodes of hallucinations/unusual perceptual experiences in the past month, with a letter-identification task that determined the contrast level required to achieve 80% accuracy. Contrast sensitivity was further assessed with a chart that presented stimuli at multiple spatial frequencie

SUBMITTER: Diaz-Santos M 

PROVIDER: S-EPMC7780942 | biostudies-literature | 2021 Jan

REPOSITORIES: biostudies-literature