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• W2895945658 abstract "Abstract Background Transitions between wakefulness and anesthesia are accompanied by profound changes in brain functioning. A key challenge is to disentangle neuronal mechanisms specific to loss and recovery of consciousness, from more general effects that are not directly related to the capacity for conscious experience. Measures of neuronal diversity have been recently proposed to constitute a robust correlate of the global states of consciousness. In the present study we investigated whether EEG signal diversity is indeed related to behavioral responsiveness during propofol sedation, or rather to the general drug-related effects. Methods We reanalyzed data collected from 20 subjects sedated with propofol. Based on the responsiveness to auditory stimuli all subjects were subdivided into two subgroups - responsive (n = 13), who remains awake throughout the experiment, and drowsy (n = 7), who becomes unresponsive during moderate sedation. Resting state EEG recorded during wakefulness and sedation was characterized by the Mean Information Gain - an information-theory measure estimating signal diversity. Results In line with our hypothesis, the drowsy group exhibited a decrease in diversity during sedation but, unexpectedly, the responsive group exhibited a robust increase in diversity (ANOVA group x state interaction: F(3) = 7.81, p 100). Conclusions We revealed that propofol sedation is initially related to an increase in EEG signal diversity, and that only upon loss of responsiveness EEG diversity decreases. The qualitatively different pattern of changes in the responsive and drowsy groups makes EEG diversity a robust indirect index of responsiveness and, presumably, consciousness." @default.
• W2895945658 created "2018-10-26" @default.
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• W2895945658 date "2018-10-16" @default.
• W2895945658 modified "2023-10-18" @default.
• W2895945658 title "EEG signal diversity reflects capability for behavioral responsiveness during propofol sedation" @default.
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