Egbert Juergens & Frank Roesler (1995) How do Alpha Oscillations Influence Gamma Band Activity? . Psycoloquy: 6(09) Brain Rhythms (10)
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Psycoloquy 6(09): How do Alpha Oscillations Influence Gamma Band Activity?

HOW DO ALPHA OSCILLATIONS INFLUENCE GAMMA BAND ACTIVITY?
Commentary on Pulvermueller et al. on Brain-Rhythms

Egbert Juergens & Frank Roesler
Department of Psychology
Philipps-University Marburg
Gutenbergstrasse 18
D-35032 Marburg

juergens@mailer.uni-marburg.de roesler@mailer.uni-marburg.de

Abstract

Gamma-band activity, as examined by Pulvermueller et al. (1994) is not necessarily a genuine and independent phenomenon but may be an epiphenomenon of activity changes in lower frequency bands. Recent experiments have shown a strong contribution of harmonics of alpha activity to activity in the beta and gamma ranges. The target article and the response to the commentary of Mueller & Jokeit (1994) do not present enough evidence to invalidate the hypothesis that the observed gamma-band effects are merely due to changes in alpha power.

Keywords

brain theory, cell assembly, cognition, event related potentials (ERP), electroencephalograph (EEG), gamma band, Hebb, language, lexical processing, magnetoencephalography (MEG), psychophysiology, periodicity, power spectral analysis, synchrony

References