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Spontaneous α Brain Dynamics Track the Episodic "When".

Leila Azizi1, Ignacio Polti2,3, Virginie van Wassenhove4

  • 1Cognitive Neuroimaging Unit, NeuroSpin, Commissariat à l'énergie atomique et aux énergies alternatives, Institut National de la Santé et de la Recherche Médicale, Université Paris-Saclay, Gif/Yvette 91191, France.

The Journal of Neuroscience : the Official Journal of the Society for Neuroscience
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Summary
This summary is machine-generated.

Alpha brain bursts track retrospective time perception in humans. This neural activity predicts how long minutes feel when not actively timing, suggesting a role in conscious time awareness.

Keywords:
burstneural oscillationsnonstationaritypassage of timeretrospective durationtime perception

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Area of Science:

  • Neuroscience
  • Cognitive Science
  • Psychology

Background:

  • Neural mechanisms underlying the sense of time passing remain largely unknown.
  • Brain activity is known to be nonstationary, with rhythmic bursts, particularly in the alpha frequency range (7-14 Hz).
  • Previous hypotheses suggested alpha rhythms might function as an internal clock, but their bursty nature posed challenges to this idea.

Purpose of the Study:

  • To investigate whether neural signatures of time-tracking, specifically alpha burst activity, exist in humans.
  • To determine if alpha burst characteristics predict retrospective and prospective time estimations.
  • To explore the role of alpha bursts in conscious awareness of time passage.

Main Methods:

  • Magnetoencephalography (MEG) was used to record brain activity in participants resting quietly.
  • Participants were assessed on retrospective time judgments (unaware of timing) and prospective time estimations (instructed to time).
  • The duration, power, and amplitude of alpha bursts were analyzed in relation to time perception tasks.

Main Results:

  • The relative duration of alpha bursts significantly predicted retrospective time estimates in participants not attending to time.
  • Alpha burst duration was a more effective predictor than alpha power or amplitude.
  • This predictive relationship vanished during prospective timing, and alpha burst counts differed between prospective and retrospective conditions.
  • The association between alpha bursts and retrospective time persisted even during a concurrent visual counting task.

Conclusions:

  • Spontaneous alpha bursts, particularly their relative duration, serve as a neural marker for conscious retrospective time perception at the scale of minutes.
  • Alpha bursts may represent discrete states of awareness that constitute episodic timing when attention is not directed towards time.
  • These findings support the hypothesis that alpha brain activity plays a crucial role in tracking subjective time, especially in the absence of explicit time monitoring.