Effects of 20-min audio-visual stimulation (AVS) at dominant alpha frequency and twice dominant alpha frequency on the cortical EEG

Author(s): Lubar, J. F., Rasey, H. W., Frederick, J. A.

Journal/Book: Int J Psychophysiol. 1999; 32: PO Box 211, 1000 AE Amsterdam, Netherlands. Elsevier Science Bv. 55-61.

Abstract: The effects of audio-visual stimulation at the dominant alpha frequency and twice dominant alpha frequency on the EEG were investigated. An eyes-closed baseline EEG determined each subject's dominant alpha frequency. Subjects were stimulated at their dominant alpha frequency and at twice dominant alpha frequency for 20 min on two occasions. A 30-min post-session eyes-closed EEG was recorded after each session. Power data were analyzed for 19 locations in six bandpasses using repeated-measures ANOVAs and appropriate post-hoc tests. Alpha stimulation significantly increased power over baseline levels in the delta I, delta 2, theta, beta 1 and beta 2, with significant effects remaining 30 min later in beta 1. Twice alpha stimulation significantly increased theta, beta 1 and beta 2 power over baseline levels, with significant effects remaining 30 min later in theta, alpha, beta 1 and beta 2.

Note: Article Timmermann DL, Univ Tennessee, Dept Psychol, 307 Austin Peay Bldg, Knoxville,TN 37996 USA

Keyword(s): audio-visual stimulation (AVS); electroencephalography (EEG); alpha stimulation; beta stimulation; electrophysiological-measures; RESPONSES

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