Accession Number : ADP006079

Title :   A Statistical Procedure for the Evaluation of Presence/Non-Presence of Stimulus-Related EEG Activity,

Corporate Author : ADVISORY GROUP FOR AEROSPACE RESEARCH AND DEVELOPMENT NEUILLY-SUR-SEINE (FRAN CE)

Personal Author(s) : Bachen, Nils I.

Report Date : FEB 1988

Pagination or Media Count : 9

Abstract : Averaging of a sufficient number of stimulus-related sample functions is a commonly applied method for the demonstration of evoked activity in the electroencephalogram (EEG). However, problems may arise in the visual evaluation of averaged waveforms when the signal-to-noise ratio is low, such as for instance in certain cerebral disease conditions, or when the intensity of the stimuli is low (threshold studies). In such situations the question of presence or not of evoked activity may be of material importance. Even experienced observers will find it difficult to give a reliable answer if their judgement has to depend only on visual assessment of the averaged waveforms obtained. A statistical test for the presence of evoked activity may be a guide to the correct decision in such cases. (js)

Descriptors :   *CEREBRUM, DISEASES, ELECTROENCEPHALOGRAPHY, INTENSITY, SIGNAL TO NOISE RATIO, STATISTICAL TESTS, STIMULI, TEST AND EVALUATION, THRESHOLD EFFECTS, VISION, VISUAL INSPECTION.

Subject Categories : Psychology
      Medicine and Medical Research

Distribution Statement : APPROVED FOR PUBLIC RELEASE