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Perceptual cycles travel across retinotopic space

View ORCID ProfileCamille Fakche, View ORCID ProfileLaura Dugué
doi: https://doi.org/10.1101/2022.05.04.490030
Camille Fakche
1Université Paris Cité, CNRS, Integrative Neuroscience and Cognition Center, F-75006 Paris, France
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  • For correspondence: camille.fakche@gmail.com
Laura Dugué
1Université Paris Cité, CNRS, Integrative Neuroscience and Cognition Center, F-75006 Paris, France
2Institut Universitaire de France (IUF), Paris, France
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Summary

Visual perception waxes and wanes periodically as a function of the phase of low-frequency brain oscillations (theta, 4-7 Hz; alpha, 8-13 Hz) [1–9]. Perceptual cycles are defined as the corresponding periodic modulation of perceptual performance (review [10, 11]). Here, using psychophysics, we tested the hypothesis that brain oscillations travel across the visual cortex, leading to predictable perceptual consequences across the visual field, i.e., perceptual cycles travel across the retinotopic visual space. An oscillating disk (inducer) was presented in the periphery of the visual field to induce brain oscillations at low frequencies (4, 6, 8 or 10 Hz) at a specific retinotopic cortical location. Target stimuli at threshold (50% detection) were displayed at random times during the periodic disk stimulation, at one of three possible distances from the disk. Electroencephalography (EEG) was recorded while participants performed a detection task. EEG analyses showed that the periodic stimulation produced a complex brain oscillation composed of the induced frequency and its first harmonic likely due to the overlap of the periodic response and the neural response to individual stimuli. This complex oscillation, which originated from a precise retinotopic position, modulated detection performance periodically at each target position and at each frequency. Critically, the optimal behavioral phase, i.e., of highest performance, of the 8 Hz and 10 Hz oscillations (alpha range) consistently shifted across target distance to the inducer. Together, the results demonstrate that alpha-induced perceptual cycles traveled across the retinotopic space in human observers at a propagation speed between 0.2 and 0.4 m/s.

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 May 05, 2022.
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Perceptual cycles travel across retinotopic space
Camille Fakche, Laura Dugué
bioRxiv 2022.05.04.490030; doi: https://doi.org/10.1101/2022.05.04.490030
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Perceptual cycles travel across retinotopic space
Camille Fakche, Laura Dugué
bioRxiv 2022.05.04.490030; doi: https://doi.org/10.1101/2022.05.04.490030

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