Gamma-band responses in the brain: A short review of psychophysiological correlates and functional significance

Author(s): Struber, D., Schurmann, M., Stadler, M., Basar, E.

Journal/Book: Int J Psychophysiol. 1996; 24: PO Box 211, 1000 AE Amsterdam, Netherlands. Elsevier Science BV. 101-112.

Abstract: The present study shows that gamma-band (40 Hz) activities exist in a number of brain structures of different species, with seemingly different functional/behavioral correlates. This rhythm has also different dynamics in various structures and under different experimental conditions: it exists spontaneously and/or can be evoked, induced or emitted with different latencies and relations to sensory-cognitive events. Recent measurements of gamma-band activity at the cellular level stress high level functional correlates such as binding of features. In contrast, field potential measurements in both humans and animals demonstrate that gamma-band responses may have multifold functions both in 'obligatory' sensory and in cognitive processing. With respect to the generators of gamma activity, experimental data hint at the existence of a distributed gamma system in the brain. Furthermore, an interpretation of gamma rhythms as universal functional building blocks is suggested.

Note: Article VS-Card BasarEroglu C, Univ Bremen, Inst Psychol & Cognit Res, D-28334 Bremen, GERMANY

Keyword(s): gamma-band activity; 40 Hz EEG; perception; reversible figures; diffuse gamma system; NON-LINEAR DYNAMICS; CAT VISUAL-CORTEX; EVOKED-POTENTIALS; VISCERAL GANGLION; FIELD POTENTIALS; HELIX-POMATIA; BETA-RHYTHMS; OSCILLATIONS; HIPPOCAMPUS; EEG

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