Postdiction: when temporal regularity drives space perception through pre-stimulus alpha oscillations

Grabot L, Kayser C, van Wassenhove V (2021)
eneuro: ENEURO.0030-21.2021.

Zeitschriftenaufsatz | Veröffentlicht | Englisch
 
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Autor*in
Grabot, LaetitiaUniBi; Kayser, ChristophUniBi ; van Wassenhove, Virginie
Abstract / Bemerkung
In postdiction, the last stimulus of a sequence changes the perception of the preceding stimuli. Postdiction has been reported in all sensory modalities but its neural underpinnings remain poorly understood. In the rabbit illusion, a sequence of non-equidistant stimuli presented isochronously is perceived as equidistantly spaced. This illusion might be driven by an internal prior favoring a constant-speed motion. Here, we hypothesized that pre-stimulus alpha oscillations (8 – 12 Hz), known to correlate with perceptual expectations and biases, would reflect the degree to which perceptual reports are influenced by a constant-speed prior. Human participants were presented with ambiguous visual sequences while being recorded simultaneously with MEG and EEG: the same sequences yielded an illusory perception in about half the trials, allowing contrasting brain responses elicited by identical sequences causing distinct percepts. As a proxy of an individual’s prior, we used the percentage of perceived illusion and the detection criterion, assuming that a strong constant-speed prior would result in a higher rate of illusory percepts. We found that high fronto-parietal alpha power was associated with perceiving the sequence according to the individual’s prior: participants with high susceptibility to the illusion would report the illusion, while participants with low susceptibility would report the veridical sequence. Additionally, we found that pre-stimulus alpha phase in occipito-parietal regions dissociated illusion from no-illusion trials. We interpret our results as suggesting that alpha power reflects an individual’s constant-speed prior whereas alpha phase modulates sensory uncertainty.
Erscheinungsjahr
2021
Zeitschriftentitel
eneuro
Art.-Nr.
ENEURO.0030-21.2021
eISSN
2373-2822
Page URI
https://pub.uni-bielefeld.de/record/2956807

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Grabot L, Kayser C, van Wassenhove V. Postdiction: when temporal regularity drives space perception through pre-stimulus alpha oscillations. eneuro. 2021: ENEURO.0030-21.2021.
Grabot, L., Kayser, C., & van Wassenhove, V. (2021). Postdiction: when temporal regularity drives space perception through pre-stimulus alpha oscillations. eneuro, ENEURO.0030-21.2021. https://doi.org/10.1523/ENEURO.0030-21.2021
Grabot, L., Kayser, C., and van Wassenhove, V. (2021). Postdiction: when temporal regularity drives space perception through pre-stimulus alpha oscillations. eneuro:ENEURO.0030-21.2021.
Grabot, L., Kayser, C., & van Wassenhove, V., 2021. Postdiction: when temporal regularity drives space perception through pre-stimulus alpha oscillations. eneuro, : ENEURO.0030-21.2021.
L. Grabot, C. Kayser, and V. van Wassenhove, “Postdiction: when temporal regularity drives space perception through pre-stimulus alpha oscillations”, eneuro, 2021, : ENEURO.0030-21.2021.
Grabot, L., Kayser, C., van Wassenhove, V.: Postdiction: when temporal regularity drives space perception through pre-stimulus alpha oscillations. eneuro. : ENEURO.0030-21.2021 (2021).
Grabot, Laetitia, Kayser, Christoph, and van Wassenhove, Virginie. “Postdiction: when temporal regularity drives space perception through pre-stimulus alpha oscillations”. eneuro (2021): ENEURO.0030-21.2021.

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PMID: 34380655
PubMed | Europe PMC

Preprint: 10.1101/2021.01.24.427978

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