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Modulation of Individual Alpha Frequency with tACS shifts Time Perception

View ORCID ProfileG. Mioni, A. Shelp, C. T. Stanfield-Wiswell, K. A. Gladhill, F. Bader, M. Wiener
doi: https://doi.org/10.1101/2020.07.23.218230
G. Mioni
1Department of General Psychology, University of Padova, Italy
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  • For correspondence: giovanna.mioni@unipd.it mwiener@gmu.edu
A. Shelp
2Department of Psychology, George Mason University, Fairfax, VA, USA
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C. T. Stanfield-Wiswell
2Department of Psychology, George Mason University, Fairfax, VA, USA
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K. A. Gladhill
2Department of Psychology, George Mason University, Fairfax, VA, USA
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F. Bader
2Department of Psychology, George Mason University, Fairfax, VA, USA
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M. Wiener
2Department of Psychology, George Mason University, Fairfax, VA, USA
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  • For correspondence: giovanna.mioni@unipd.it mwiener@gmu.edu
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ABSTRACT

Previous studies have linked brain oscillation and timing, with evidence suggesting that alpha oscillations (10Hz) may serve as a “sample rate” for the visual system. However, direct manipulation of alpha oscillations and time perception has not yet been demonstrated. Eighteen subjects performed a time generalization task with visual stimuli. Participants first learned the standard intervals (600 ms) and then were required to judge the new temporal intervals if they were equal or different compared to the standard. Additionally, we had previously recorded resting-state EEG from each subject and calculated their Individual Alpha Frequency (IAF), estimated as the peak frequency from the mean spectrum over posterior electrodes between 8 and 13 Hz. After learning the standard interval, participants performed the time generalization task while receiving occipital transcranial Alternating Current Stimulation (tACS). Crucially, for each subject, tACS was administered at their IAF or at off-peak alpha frequencies (IAF±2 Hz). Results demonstrated a linear shift in the psychometric function indicating a modification of perceived duration, such that progressively “faster” alpha stimulation led to longer perceived intervals. These results provide the first evidence that direct manipulations of alpha oscillations can shift perceived time in a manner consistent with a clock speed effect.

Competing Interest Statement

The authors have declared no competing interest.

Copyright 
The copyright holder for this preprint is the author/funder, who has granted bioRxiv a license to display the preprint in perpetuity. It is made available under a CC-BY-NC-ND 4.0 International license.
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Posted July 24, 2020.
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Modulation of Individual Alpha Frequency with tACS shifts Time Perception
G. Mioni, A. Shelp, C. T. Stanfield-Wiswell, K. A. Gladhill, F. Bader, M. Wiener
bioRxiv 2020.07.23.218230; doi: https://doi.org/10.1101/2020.07.23.218230
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Modulation of Individual Alpha Frequency with tACS shifts Time Perception
G. Mioni, A. Shelp, C. T. Stanfield-Wiswell, K. A. Gladhill, F. Bader, M. Wiener
bioRxiv 2020.07.23.218230; doi: https://doi.org/10.1101/2020.07.23.218230

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