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The relationship between individual alpha frequency and time perception: Testing the internal clock versus the

Matteo Frisoni1, Luca Tarasi1, Sara Borgomaneri1

  • 1Center for Studies and Research in Cognitive Neuroscience, Department of Psychology "Renzo Canestrari", University of Bologna, Cesena Campus, Italy.

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Summary

Individual Alpha Frequency (IAF) influences time perception accuracy, not bias. Higher IAF correlates with better temporal sensitivity, supporting an alpha oscillation sampling mechanism over the traditional internal clock pacemaker model.

Keywords:
Alpha oscillationsIndividual alpha frequencyResting-state EEGSignal detection theoryTime perception

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Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Psychophysics

Background:

  • Accurate time perception is crucial for daily functioning.
  • The role of alpha oscillations in time perception is debated, with hypotheses including an internal clock pacemaker versus a sensory sampling mechanism.

Purpose of the Study:

  • To investigate the relationship between Individual Alpha Frequency (IAF) and fine-grained time perception.
  • To differentiate between the internal clock pacemaker and sensory sampling rate hypotheses of alpha oscillations in temporal processing.

Main Methods:

  • Utilized resting-state Electroencephalography (EEG) to measure IAF in 50 healthy volunteers.
  • Employed Signal Detection Theory (SDT) and a time-discrimination task with 100 and 500 msec standard durations.

Main Results:

  • Higher IAF was significantly correlated with enhanced temporal sensitivity (d'), indicating more accurate time judgments.
  • No significant effect of IAF on temporal bias (c) was found.
  • Correlations were observed in frontocentral brain regions and were more pronounced for shorter (100 msec) durations.

Conclusions:

  • Findings support the hypothesis that alpha oscillations contribute to temporal sensitivity through enhanced sensory sampling, rather than acting as an internal clock pacemaker.
  • Individual Alpha Frequency (IAF) plays a key role in the precision of temporal judgments.
  • This study challenges traditional models and suggests a distributed neural mechanism for time perception.