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Power of Evoked γ Responses to a Facial Expression Using an 8-Second Pause between Target and Trigger Stimuli

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EEG power in the γ range (21–60 Hz) was assessed during the formation and testing of a cognitive set to a facial expression in terms of a model assuming that the loading on working memory could be increased by increasing the pause between the target and trigger stimuli to 8 sec. The results were compared with data from previous experiments with increased loading in the form of an additional cognitive task, when there was an increase in the power of γ responses. The present experiments demonstrated a decrease in the power of γ responses to set stimuli (with respect to the level during the prestimulus period) in all groups of subjects, which is interpreted as a sign associated with inhibition of γ activity. Significant differences in γ-range power levels between these groups were seen on comparison of set stages (formation and testing), and on comparison of frequency ranges. The second important finding was the absence of any differences in the dynamics of the power of γ2 patterns (41–60 Hz) between groups of subjects depending on the “success” of task performance. Arguments are proposed whereby the paradoxical nature of the present results are explained in terms of the conditions in which this set model is used.

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Authors and Affiliations

  1. Institute of Higher Nervous Activity and Neurophysiology, Russian Academy of Sciences, Moscow, Russia

    V. N. Dumenko, M. K. Kozlov & E. A. Cheremushkin

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  1. V. N. Dumenko
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  2. M. K. Kozlov
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  3. E. A. Cheremushkin
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Correspondence to V. N. Dumenko.

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Translated from Zhurnal Vysshei Nervnoi Deyatel’nosti imeni I. P. Pavlova, Vol. 64, No. 4, pp. 401–411, July–August, 2014.

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Dumenko, V.N., Kozlov, M.K. & Cheremushkin, E.A. Power of Evoked γ Responses to a Facial Expression Using an 8-Second Pause between Target and Trigger Stimuli. Neurosci Behav Physi 46, 178–185 (2016). https://doi.org/10.1007/s11055-015-0216-3

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