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Feature-Based Information Filtering in Visual Working Memory is impaired in Parkinson's Disease.

07:00 EST 7th February 2018 | BioPortfolio

Summary of "Feature-Based Information Filtering in Visual Working Memory is impaired in Parkinson's Disease."

Increasing attention has been given to working memory (WM) impairment in Parkinson's disease (PD) patients. Previous studies revealed that the space-orientated feature-based filtering (target and distractors in distinct locations) was impaired in PD patients. However, the object-orientated feature-based filtering (target and distractor information pertaining to one object) ability in PD patients remains unclear. In this study, we examined the object-orientated feature-based filtering ability of 14 PD patients and 14 healthy controls in a change detection task under EEG monitoring. Participants were asked to remember the colors of two different objects while ignoring their shapes. Critically, the irrelevant feature could be changed in the probe. A failure in complete feature-based filtering would lead to an "irrelevant-change distracting effect," where the change of the irrelevant feature would impair the performance of the target feature, and lead to an enhanced anterior N2. We found that the distracting effect was larger in PD patients than in the control group in terms of d'; however, the N2 amplitude evoked by the irrelevant change was smaller in PD patients than in the control group. These results suggested that the object-orientated feature-based filtering ability was impaired in PD, which might derive from the deficit of their executive control.

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This article was published in the following journal.

Name: Neuropsychologia
ISSN: 1873-3514
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Temporary visual deficit or impaired visual processing occurring in a rapid serial visual presentation task. After a person identifies the first of two visual targets, the ability to detect the second target is impaired for the next few hundred milliseconds. This phenomenon is called attentional blink.

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