The effects of alpha (10-Hz) and beta (22-Hz) ''entrainment'' stimulation on the alpha and beta EEG bands: Individual differences are critical to prediction of effects

Author(s): Reinhart, A. M., Srivastava, S.

Journal/Book: Appl Psychophysiol Biofeedbac. 1997; 22: 233 Spring St, New York, NY 10013. Plenum Publ Corp. 3-20.

Abstract: Two different groups of normal college students were formed: One (the alpha group) received 10-Hz audiovisual (AV) stimulation for 8 minutes, and the other (beta) group received 22-Hz AV stimulation for 8 minutes. EEG power in the alpha (8-13 Hz) and beta (13-30 Hz) bands was FFT-extracted before, during, and for 24 minutes after stimulation. It was found that baseline (prestimulation) alpha and beta power predict the effects of stimulation, leading to individual differences in responsivity. High-baseline alpha participants showed either no entrainment or relatively prolonged entrainment with alpha stimulation. Low-baseline participants showed transient entrainment. Baseline alpha also predicted the direction of change in alpha with beta stimulation. Baseline beta and alpha predicted beta band response to beta stimulation, which was transient enhancement in some participants, inhibition in others. Some participants showed relatively prolonged beta enhancement with beta stimulation.

Note: Article Rosenfeld JP, Northwestern Univ, Dept Psychol, 2029 Sheridan Rd, Evanston,IL 60208 USA

Keyword(s): EEG; entrainment; photic-acoustic driving; steady state evoked responses; RESPONSES

Zurück | Weiter