Ontology type: schema:ScholarlyArticle
1992-09
AUTHORSAlexander Gundel, Glenn F. Wilson
ABSTRACTAn experiment was carried out to investigate the hypothesis that task difficulty is reflected in changes in the topographical distribution of the ongoing EEG. Subjects had to perform three different tasks at two difficulty levels each; the Sternberg memory scanning task in an auditory and in a visual mode and a task whose performance required mainly visual scanning. Task difficulty was verified by the measurement of response times. Using a commercial Brain Electrical Activity Mapping device, EEG was recorded from 19 scalp electrodes while the subjects performed the tasks. Spectral matrices of the EEG were calculated to investigate spatial relationships in the EEG. Compared to the lower level, higher task difficulty resulted in EEG changes that led to the identification of two factors. One was the reduction of parietal and occipital alpha activity due to the amount of visual scanning and the other an increase of theta activity in the left frontal electrodes which may be associated with the amount of general mental processing. More... »
PAGES17-25
http://scigraph.springernature.com/pub.10.1007/bf01129966
DOIhttp://dx.doi.org/10.1007/bf01129966
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PUBMEDhttps://www.ncbi.nlm.nih.gov/pubmed/1463655
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