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Brain bioelectrical activity at a high anxiety level in humans

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Abstract

Brain bioelectrical activity was studied in 38 and 34 subjects with high and low levels of anxiety, respectively, by means of toposelective mapping of EEG spectral power and recording of P300 endogenous event-related auditory evoked potentials (EPs). Analysis of EEG spectra demonstrated, in the subjects with a high level of trait anxiety, a higher power of β1 oscillations in the central-parietal areas of both hemispheres and the occipital area of the right hemisphere, as well as a higher power of θ and α oscillations in the frontal areas of both hemispheres and the central-parietal area of the left hemisphere. The occipital-frontal gradient of the spectral power of these rhythmic EEG components was altered in subjects with a high level of trait anxiety. Comparison of P300 cognitive auditory EPs in the subjects with high anxiety and in the control group showed that, in the former, the P300 EP amplitude and the habituation distortion (dishabituation) of the P300 EP amplitude were significantly higher in both hemispheres. This indicates that, at a high level of anxiety, the active directed attention was disturbed, which is confirmed by the results of neuropsychological examination, demonstrating reduced selectivity, concentration, and stability of attention in the Münsterberg test and Schulte’s test. The results of electrophysiological examination suggest that the malfunction of regulatory brain modulating systems is an important neurophysiological mechanism of attention pathology and disturbed adaptation in subjects with a high level of trait anxiety.

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  1. Brain Research Institute, Russian Academy of Medical Sciences, Moscow, 103064, Russia

    S. A. Gordeev

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Original Russian Text © S.A. Gordeev, 2007, published in Fiziologiya Cheloveka, 2007, Vol. 33, No. 4, pp. 11–17.

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Gordeev, S.A. Brain bioelectrical activity at a high anxiety level in humans. Hum Physiol 33, 388–393 (2007). https://doi.org/10.1134/S0362119707040020

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  • DOI: https://doi.org/10.1134/S0362119707040020

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