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| Research article summary (published 29 Sep 2002): |
Preparatory slow potentials and event-related potentials in an auditory cued attention task.
Full Abstract
OBJECTIVES:
To examine reaction times and event-related potentials (ERPs) in an auditory cued attention task varying motor requirements, cue validity, and cue location.METHODS:
Subjects (n=13) listened to cue-target stimulus pairs. Verbal cues (monaural, binaural) indicated the ear to receive a target tone 1.5s later. Cues correctly (valid) or incorrectly (invalid) predicted target ear, or were uninformative (neutral). In separate conditions subjects either responded by pressing one of two buttons, or did not respond to targets. ERPs for cues and targets (P50, N100, P200, late slow wave), and negative slow potentials between cues and targets were assessed.RESULTS:
Target reaction times for valid cues were significantly shorter than for invalid cues, with intermediate values for neutral cues. When no motor response was required larger ERPs were seen to both cues and targets. Negative slow potentials had larger amplitudes before target presentation when subjects responded to targets; and were larger following neutral, vs. valid/invalid, cues. ERPs (N100, P200) to invalidly cued targets were significantly larger and a subsequent late slow wave was more positive, relative to validly cued targets.CONCLUSIONS:
Expectancy for targets begins shortly after cue presentation, and is affected by both motor requirements and the information content of the cue. ERP amplitudes to targets are modulated by the correspondence between cue information and actual target location.
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Author information
Author/s: Golob, E J (EJ); Pratt, H (H); Starr, A (A);
Affiliation: Institute for Brain Aging and Dementia, University of California, Irvine 92697, USA. egolob@uci.edu
Grants: 5 T32 AG00096-17 (Agency:United States NIA)
Journal and publication information
Publication Type: Clinical Trial; Journal Article; Research Support, U.S. Gov't, P.H.S.
Journal: Clinical neurophysiology : official journal of the International Federation of Clinical Neurophysiology (Clin Neurophysiol), published in Netherlands. (Language: eng)
Reference: 2002-Oct; vol 113 (issue 10) : pp 1544-57
Dates: Created 2002/09/27; Completed 2002/12/04; Revised 2008/09/10;
PMID: 12350430, 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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