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Brain mechanisms for perceiving illusory lines in humans.

  • Anken J The LINE (Laboratory for Investigative Neurophysiology), Department of Radiology and Department of Clinical Neurosciences, University Hospital Center and University of Lausanne, Lausanne, Switzerland.
  • Tivadar RI The LINE (Laboratory for Investigative Neurophysiology), Department of Radiology and Department of Clinical Neurosciences, University Hospital Center and University of Lausanne, Lausanne, Switzerland; Department of Ophthalmology, University of Lausanne, Fondation Asile des Aveugles, Lausanne, Switzerland.
  • Knebel JF The LINE (Laboratory for Investigative Neurophysiology), Department of Radiology and Department of Clinical Neurosciences, University Hospital Center and University of Lausanne, Lausanne, Switzerland; Electroencephalography Brain Mapping Core, Center for Biomedical Imaging (CIBM) of Lausanne and Geneva, Switzerland.
  • Murray MM The LINE (Laboratory for Investigative Neurophysiology), Department of Radiology and Department of Clinical Neurosciences, University Hospital Center and University of Lausanne, Lausanne, Switzerland; Department of Ophthalmology, University of Lausanne, Fondation Asile des Aveugles, Lausanne, Switzerland; Electroencephalography Brain Mapping Core, Center for Biomedical Imaging (CIBM) of Lausanne and Geneva, Switzerland; Department of Hearing and Speech Sciences, Vanderbilt University, Nashville, TN, USA. Electronic address: Micah.murray@chuv.ch.
  • 2018-07-17
Published in:
  • NeuroImage. - 2018
Event-related potential (ERP)
Illusory contour
Kanizsa
Visual evoked potential (VEP)
Adult
Contrast Sensitivity
Electroencephalography
Evoked Potentials, Visual
Female
Functional Neuroimaging
Humans
Illusions
Male
Occipital Lobe
Pattern Recognition, Visual
Visual Cortex
Young Adult
English 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).
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  • English
Open access status
green
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https://sonar.ch/global/documents/126330
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