Cognitive impairment in Parkinson's disease revealed by event-related potential N270.

Full Abstract

Disturbed cognitive function is a well-recognized feature of idiopathic Parkinson's disease (PD). The aim of this study was to find a susceptive index to reveal the minor cognitive impairment in PD patients. Thirty PD patients without clinical dementia and thirty-four age-matched normal controls performed a matching task while event-related potentials (ERPs) were recorded from their scalp. There were two kinds of stimulus pairs in this study:
match condition, the second stimulus (S2) in a pair was identical to the first one (S1); conflict condition, S2 conflicted with S1 in the color attribute. Subjects were required to press a button in the match condition and another button in the conflict condition. A negative ERP component, N270, which was considered to reflect the conflict processing activity in human brain, was evoked by the S2 of the conflict condition. The patient group showed a delayed and smaller N270 than the control group. The prolongation of its peak latency was significant at P3 and P4 electrodes and the reduction of its mean amplitude was significant at P3 electrode. The amplitude of P300 elicited in the match condition was decreased in the patient group at P4 electrode but its latency did not differ from the control group. These results indicate that PD patients as a group showed cognitive decline even in the absence of clinical dementia. N270 is a sensitive index in revealing this minor cognitive impairment.

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Author information

Author/s: Wang, H (H); Wang, Y (Y); Wang, D (D); Cui, L (L); Tian, S (S); Zhang, Y (Y);

Affiliation: Department of Neurology, Xuanwu Hospital, Capital University of Medical Sciences, 100053, Beijing, People's Republic of China.

Journal and publication information

Publication Type: Clinical Trial; Controlled Clinical Trial; Journal Article; Research Support, Non-U.S. Gov't

Journal: Journal of the neurological sciences (J Neurol Sci), published in Netherlands. (Language: eng)

Reference: 2002-Feb; vol 194 (issue 1) : pp 49-53

Dates: Created 2002/01/25; Completed 2002/03/29; Revised 2006/11/15;

PMID: 11809166, status: MEDLINE (last retrieval date: 12/26/2008)

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MeSH headings (categories)

This article was linked to the MESH Headings shown below.

Adult
Aged
Analysis of Variance
Brain - physiology; physiopathology
Cognition Disorders - complications; diagnosis; physiopathology
Electroencephalography
Evoked Potentials
Female

Humans
Male
Middle Aged
Parkinson Disease - complications; diagnosis; physiopathology
Photic Stimulation
Predictive Value of Tests
Reaction Time
Sensitivity and Specificity

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