PMID: 9545665Apr 18, 1998Paper

Effects of memory load on event-related patterns of 40-Hz EEG during cognitive and motor tasks

International Journal of Psychophysiology : Official Journal of the International Organization of Psychophysiology
V De Pascalis, W J Ray

Abstract

The present study describes a phasic event-related synchronization (ERS) in the gamma band (36-44 Hz) induced by the onset of probe visual stimuli. The experiment consisted of two experimental tasks with high and low memory-load in which a geometrical figure (S1) was held in memory for comparison with a subsequent stimulus (S2). In each task a Go-NoGo paradigm was used with a Same-Different discrimination task. The aim of the study was to examine the influence on 40-Hz ERS of stimulus type ('Same-Different') and of response (Go-NoGo) task as moderated by activation or effort level (high/low memory-load). The investigation was carried out in 27 women. The EEG was recorded from FP1, FP2, F3, F4, P3, P4, O1 and O2 scalp sites referenced to linked earlobes. As a manipulation check for activation level, we recorded heart rate (HR) during the S1-S2 period. A main peak of activity was found around 160 ms with a maximum at occipital sites. The amplitude of this peak was higher in the high memory-load as compared to the low memory-load condition. This difference was manifested mainly at F3 and O2 scalp sites. A larger 40-Hz peak at F3 was also found in the Go compared to the NoGo condition. No 40-Hz ERS differences between Same and Diff...Continue Reading

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Citations

Dec 31, 2002·Brain Research. Brain Research Reviews·Kwang-Hyuk LeeEvian Gordon
Nov 16, 2002·International Journal of Psychophysiology : Official Journal of the International Organization of Psychophysiology·Adrian P Burgess, Lia Ali
May 30, 2001·Clinical Neurophysiology : Official Journal of the International Federation of Clinical Neurophysiology·J YordanovaA Rothenberger
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