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| Research article summary (published 29 Apr 2003): |
Effects of auditory stimulus intensity and hearing threshold on the relationship among P300, age, and cognitive function.
Full Abstract
OBJECTIVE:
Although P300 is regarded as cognitive or endogenous, studies have demonstrated that stimulus intensity influences the component. To isolate effects of hearing from cognition, two experiments were designed to compare the effects of variation in stimulus intensities with naturally occurring differences in hearing thresholds.
METHODS:
In experiment 1, 18 participants were tested with 5 auditory oddball event-related potential (ERP) paradigms with different intensities. In experiment 2, an auditory oddball ERP task was completed by 3 groups of participants with different hearing thresholds (n=57). P300 was then correlated with block design and matrices from Wechsler's abbreviated scale of intelligence.
RESULTS:
At Cz and Pz, manipulation of intensity had less effect on P300 than the observed differences between groups with different hearing thresholds. At Fz, however, the effect of manipulations of stimulus intensity was greater than the effect of naturally occurring differences in hearing thresholds. P300 still correlated in predicted directions with cognitive tests after correcting for the estimated effect of differences in hearing.
CONCLUSIONS:
The results indicate that P300 is an index of cognitive function even when the relationship is corrected for perceptual differences, at least at posterior scalp areas.
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Author information
Author/s: Fjell, Anders M (AM); Walhovd, Kristine B (KB);
Affiliation: Institute of Psychology, University of Oslo, P.B. No. 1094 Blindern, Norway.
Journal and publication information
Publication Type: Comparative Study; Journal Article; Research Support, Non-U.S. Gov't
Journal: Clinical neurophysiology : official journal of the International Federation of Clinical Neurophysiology (Clin Neurophysiol), published in Netherlands. (Language: eng)
Reference: 2003-May; vol 114 (issue 5) : pp 799-807
Dates: Created 2003/05/09; Completed 2003/07/01; Revised 2008/09/10;
PMID: 12738426, status: MEDLINE (last retrieval date: 11/6/2008)
Sourced from the National Library of Medicine. Abstract text and other information may be subject to copyright.
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