Haenschel, Corinna; Baldeweg, Torsten; Croft, Rodney J.; Whittington, Miles and Gruzelier, John. 2000. Gamma and beta frequency oscillations in response to novel auditory stimuli: a comparison of human electroencephalogram (EEG) data with in vitro models. Proceedings of the National Academy of Sciences, 97(13), pp. 7645-7650. ISSN 00278424 [Article]

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Abstract or Description

Investigations using hippocampal slices maintained in vitro have demonstrated that bursts of oscillatory field potentials in the gamma frequency range (30–80 Hz) are followed by a slower oscillation in the beta 1 range (12–20 Hz). In this study, we demonstrate that a comparable gamma-to-beta transition is seen in the human electroencephalogram (EEG) in response to novel auditory stimuli. Correlations between gamma and beta 1 activity revealed a high degree of interdependence of synchronized oscillations in these bands in the human EEG. Evoked (stimulus-locked) gamma oscillations preceded beta 1 oscillations in response to novel stimuli, suggesting that this may be analogous to the gamma-to-beta shift observed in vitro. Beta 1 oscillations were the earliest discriminatory responses to show enhancement to novel stimuli, preceding changes in the broad-band event-related potential (mismatch negativity). Later peaks of induced beta activity over the parietal cortex were always accompanied by an underlying gamma frequency oscillation as seen in vitro. A further analogy between in vitro and human recordings was that both gamma and beta oscillations habituated markedly after the initial novel stimulus presentation.

Item Type:	Article
Identification Number (DOI):	https://doi.org/10.1073/pnas.120162397
Departments, Centres and Research Units:	Psychology
Dates:	Date Event June 2000 Published
Item ID:	5290
Date Deposited:	16 Mar 2011 14:47
Last Modified:	30 Jun 2017 15:27
Peer Reviewed:	Yes, this version has been peer-reviewed.
URI:	http://research.gold.ac.uk/id/eprint/5290

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