DOI: 10.1101/499517Dec 18, 2018Paper

Measuring graded changes in consciousness through multi-target filling-in

BioRxiv : the Preprint Server for Biology
Matthew James DavidsonJeroen J.A. van Boxtel

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. Compared to other visual illusions, these perceptual changes are crisp and simple, and can occur for multiple spatially-separated targets simultaneously. Contrasting neural activity during the presence or absence of PFI may complement other multistable phenomena to reveal the neural correlates of consciousness (NCC). We presented four peripheral targets over a background dynamically updating at 20 Hz. 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 facilitatory interactions exist between targets in separate visual quadrants. We also found distinct spatiotemporal correlates for the background SSVEP ha...Continue Reading

Related Concepts

Electroencephalography
Visual Evoked Cortical Potential
Neuroma
Perception
Peripheral
Location
Participant
Illusions, Visual
Surrounding (Qualifier Value)
Resin-based Composite Filling

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