A multiple-response frequency-tagging paradigm measures graded changes in consciousness during perceptual filling-in

Matthew J. Davidson*, Irene L. Graafsma, Naotsugu Tsuchiya, Jeroen Van Boxtel

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

    1 Citation (Scopus)

    Abstract

    Perceptual filling-in (PFI) occurs when a physically present visual target disappears from conscious perception, with its location filled-in by the surrounding visual background. These perceptual changes are complete, near instantaneous, and can occur for multiple separate locations simultaneously. Here, we show that contrasting neural activity during the presence or absence ofmulti-target PFI can complement other findings frommultistable phenomena to reveal the neural correlates of consciousness (NCC).We presented four peripheral targets over a background dynamically updating at 20Hz.While participants reported on target disappearances/reappearances via button press/release, we tracked neural activity entrained by the background during PFI using steady-state visually evoked potentials (SSVEPs) recorded in the electroencephalogram. We found background SSVEPs closely correlated with subjective report, and increased with an increasing amount of PFI. Unexpectedly, we found that as the number of filled-in targets increased, the duration of target disappearances also increased, suggesting that facilitatory interactions exist between targets in separate visual quadrants.We also found distinct spatiotemporal correlates for the background SSVEP harmonics. Prior to genuine PFI, the response at the second harmonic (40Hz) increased before the first (20Hz), which we tentatively link to an attentional effect, while no such difference between harmonics was observed for physically removed stimuli. These results demonstrate that PFI can be used to studymulti-object perceptual suppression when frequency-tagging the background of a visual display, and because there are distinct neural correlates for endogenously and exogenously induced changes in consciousness, that it is ideally suited to study the NCC.

    Original languageEnglish
    Article numberniaa002
    Pages (from-to)1-14
    Number of pages14
    JournalNeuroscience of Consciousness
    Volume2020
    Issue number1
    DOIs
    Publication statusPublished - 2020

    Bibliographical note

    Copyright the Author(s) 2020. Version archived for private and non-commercial use with the permission of the author/s and according to publisher conditions. For further rights please contact the publisher.

    Keywords

    • contents of consciousness
    • methodology
    • perception
    • psychophysics

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