The interplay between motion perception and perceptual completion
Year: 2025
Type: article
Abstract: • Perceptual completion aids vision overcoming stimulus noise and partial information • IC effect is a visual evoked potential characterization of perceptual completion • IC effect to moving and static stimuli was sorted by motion discrimination abilities • Individuals adept at motion discrimination exhibited distinct topographies • Motion discrimination operates synergistically with visual completion Effective visual perception surmounts noise, partial information and dynamic changes in stimuli, resulting in perceptual completion that is often studied using illusory contour (IC) stimuli. Visual evoked potentials (VEPs) from humans yield a characteristic response – the IC effect – the VEP difference between responses to the presence vs. absence of ICs with multiple phases at ∼150-200ms and ∼240-400ms post-stimulus onset. To address how motion signals and an individual’s capability to discriminate motion may contribute to perceptual completion as indexed by the IC effect , we recorded 128-channel VEPs from 20 healthy adults. On each trial, they indicated which of two stimulus arrays was perceived to move (through linear changes in stimulus size), independently of the presence/absence of ICs. Participants were sub-divided based on a median split in task performance: those “adept” and “non-adept” at detecting moving stimuli. Over the 240-329ms post-stimulus period, responses from “adept” individuals were characterized by distinct topographies depending on whether stimuli were moving, whereas for “non-adept” individuals the same topography characterized responses to both moving and static stimuli (p=0.048; η²ₚ=0.300). Furthermore, the VEP topography characterizing responses to moving ICs positively correlated with an individual’s motion discrimination accuracy (Spearman’s rho (18) =-0.467; p=0.038). Source modelling of this IC effect included regions of the lateral inferior occipital cortices, parahippocampal cortices extending into the insula, the precentral cortex, and middle frontal cortex and underscores the role of both low-level and high-level cortices in IC perception. Collectively, these data highlight the interplay between motion discrimination and perceptual completion processes.
Source: NeuroImage
Authors: Grace S. Kurian, Chrysa Retsa, Mark T. Wallace, Micah M. Murray
Language: English
Subfield: Cognitive Neuroscience
Field: Neuroscience
Domain: Life Sciences
Open Access status: gold
Estimated APC paid: $3,540
OpenAlex ID: W4416422009