Brain mechanisms for perceiving illusory lines in humans.

Details

Ressource 1Download: 10.1016AM.pdf (690.95 [Ko])
State: Public
Version: Author's accepted manuscript
Serval ID
serval:BIB_3507DEC71B52
Type
Article: article from journal or magazin.
Collection
Publications
Institution
Title
Brain mechanisms for perceiving illusory lines in humans.
Journal
NeuroImage
Author(s)
Anken J., Tivadar R.I., Knebel J.F., Murray M.M.
ISSN
1095-9572 (Electronic)
ISSN-L
1053-8119
Publication state
Published
Issued date
01/11/2018
Peer-reviewed
Oui
Volume
181
Pages
182-189
Language
english
Notes
Publication types: Journal Article ; Research Support, Non-U.S. Gov't
Publication Status: ppublish
Abstract
Illusory contours (ICs) are perceptions of visual borders despite absent contrast gradients. The psychophysical and neurobiological mechanisms of IC processes have been studied across species and diverse brain imaging/mapping techniques. Nonetheless, debate continues regarding whether IC sensitivity results from a (presumably) feedforward process within low-level visual cortices (V1/V2) or instead are processed first within higher-order brain regions, such as lateral occipital cortices (LOC). Studies in animal models, which generally favour a feedforward mechanism within V1/V2, have typically involved stimuli inducing IC lines. By contrast, studies in humans generally favour a mechanism where IC sensitivity is mediated by LOC and have typically involved stimuli inducing IC forms or shapes. Thus, the particular stimulus features used may strongly contribute to the model of IC sensitivity supported. To address this, we recorded visual evoked potentials (VEPs) while presenting human observers with an array of 10 inducers within the central 5°, two of which could be oriented to induce an IC line on a given trial. VEPs were analysed using an electrical neuroimaging framework. Sensitivity to the presence vs. absence of centrally-presented IC lines was first apparent at ∼200 ms post-stimulus onset and was evident as topographic differences across conditions. We also localized these differences to the LOC. The timing and localization of these effects are consistent with a model of IC sensitivity commencing within higher-level visual cortices. We propose that prior observations of effects within lower-tier cortices (V1/V2) are the result of feedback from IC sensitivity that originates instead within higher-tier cortices (LOC).
Keywords
Adult, Contrast Sensitivity/physiology, Electroencephalography/methods, Evoked Potentials, Visual/physiology, Female, Functional Neuroimaging/methods, Humans, Illusions/physiology, Male, Occipital Lobe/diagnostic imaging, Occipital Lobe/physiology, Pattern Recognition, Visual/physiology, Visual Cortex/diagnostic imaging, Visual Cortex/physiology, Young Adult, Event-related potential (ERP), Illusory contour, Kanizsa, Visual evoked potential (VEP)
Pubmed
Web of science
Create date
31/07/2018 12:33
Last modification date
20/08/2019 14:22
Usage data