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Individual Alpha Frequency Predicts the Sensitivity of Time Perception.

Audrey Morrow1,2, Montana Wilson1,3, Michaela Geller-Montague1

  • 1University of California, Santa Cruz, Santa Cruz, CA 95064.

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|June 12, 2025
PubMed
Summary
This summary is machine-generated.

Individual alpha frequency (IAF) influences time perception sensitivity, not bias. Higher IAF correlates with better precision in judging visual durations, especially for static stimuli, highlighting its role in temporal sensitivity.

Keywords:
alpha oscillationsduration discriminationduration estimationindividual differencestime perception

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Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Perception

Background:

  • Individual differences in alpha-band frequency are linked to temporal perception.
  • The precise role of the human alpha rhythm in time perception remains debated.
  • Previous research has not conclusively established alpha frequency as a correlate of time perception.

Purpose of the Study:

  • To investigate the association between individual alpha frequency (IAF) and temporal sensitivity and bias.
  • To evaluate whether IAF predicts precision and bias in judging visual durations across various peri-second intervals.
  • To clarify the controversial link between alpha rhythm and human time perception.

Main Methods:

  • Electroencephalography (EEG) combined with temporal estimation and discrimination tasks.
  • Participants (n=55) judged visual stimulus durations ranging from 100-1200ms.
  • Stimuli varied in duration, luminance (static vs. dynamic), and temporal presentation.

Main Results:

  • IAF significantly correlated with the precision (variance) of duration estimates, but not with bias (average estimates).
  • Psychometric function slopes in duration discrimination positively correlated with IAF, particularly for static stimuli.
  • Trial-level alpha frequency variability predicted subjective equality shifts in short duration discrimination.

Conclusions:

  • IAF is a significant factor in individual differences in the sensitivity of time perception.
  • Spontaneous fluctuations in alpha frequency around an individual's IAF can introduce bias in temporal judgments.
  • IAF serves as a neural marker for temporal sensitivity, particularly in discriminating static visual stimuli.