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Abstract <p>Studies of electrophysiological oscillations of the brain during the change of vigilance states have a long history in somnology and cognitive neuroscience. However, in modern literature, more and more attention is being paid to aperiodic electrophysiological activity co-existing with oscillations. The purpose of this study is to evaluate the relationship between the oscillatory/aperiodic components of the magnetoencephalogram and the performance of a monotonous psychomotor test that causes multiple episodes of short-term falling asleep. 25 subjects underwent a monotonous psychomotor test for 1 hour with simultaneous registration of a magnetoencephalogram. The performance dynamics of the psychomotor test correlated with the dynamics of the aperiodic exponent, as well as the oscillation power in the theta, alpha and beta bands. We found that in the majority of subjects (17 out of 25), the aperiodic exponent is the 1st or 2nd most significant predictor and tracks the subjects’ current vigilance state more precisely than oscillatory activity. We also found that the aperiodic exponent has a more consistent relationship with behavioral activity. We make a preliminary conclusion that the aperiodic exponent can be a reliable indicator of the change of vigilance states and a useful tool for studying them in cognitive sciences.</p>

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Dynamics of Periodic and Aperiodic Activity in Multiple Vigilance State Changes Induced by Monotonous Psychomotor Test

  • 期刊论文

  • 发表日期：

    2025年12月1日

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  • A. E. Manaenkov,
  • A. M. Chernorizov,
  • A. E. Ossadtchi,
  • V. B. Dorokhov

摘要

Abstract

Studies of electrophysiological oscillations of the brain during the change of vigilance states have a long history in somnology and cognitive neuroscience. However, in modern literature, more and more attention is being paid to aperiodic electrophysiological activity co-existing with oscillations. The purpose of this study is to evaluate the relationship between the oscillatory/aperiodic components of the magnetoencephalogram and the performance of a monotonous psychomotor test that causes multiple episodes of short-term falling asleep. 25 subjects underwent a monotonous psychomotor test for 1 hour with simultaneous registration of a magnetoencephalogram. The performance dynamics of the psychomotor test correlated with the dynamics of the aperiodic exponent, as well as the oscillation power in the theta, alpha and beta bands. We found that in the majority of subjects (17 out of 25), the aperiodic exponent is the 1st or 2nd most significant predictor and tracks the subjects’ current vigilance state more precisely than oscillatory activity. We also found that the aperiodic exponent has a more consistent relationship with behavioral activity. We make a preliminary conclusion that the aperiodic exponent can be a reliable indicator of the change of vigilance states and a useful tool for studying them in cognitive sciences.