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Neural correlates of perceptual filling-in of an artificial scotoma in humans

Weil, RS; Kilner, JM; Haynes, JD; Rees, G; (2007) Neural correlates of perceptual filling-in of an artificial scotoma in humans. P NATL ACAD SCI USA , 104 (12) 5211 - 5216. 10.1073/pnas.0609294104. Gold open access

Abstract

When a uniformly illuminated surface is placed eccentrically on a dynamic textured background, after a few seconds, it is perceived to disappear and be replaced by the background texture. Such texture filling-in is thought to occur in retinotopic visual cortex, but it has proven difficult to distinguish the contributions of invisible target and visible background to signals measured in these areas. Here, we used magnetoencephalography to measure time-dependent brain responses in human observers experiencing texture completion. We measured responses specifically associated with the filled-in target, by isolating neural population signals entrained at the frequency of flicker of the target. When perceptual completion occurred, and the target became invisible, there was significant reduction in the magnetoencephalography power at the target frequency over contralateral posterior sensors. However, even a subjectively invisible target nevertheless evoked frequency-specific signals compared with a no-target baseline. These data represent evidence for a persistent target-specific representation even for stimuli rendered invisible because of perceptual filling-in.

Type: Article
Title: Neural correlates of perceptual filling-in of an artificial scotoma in humans
Open access status: An open access publication
DOI: 10.1073/pnas.0609294104
Publisher version: http://www.ncbi.nlm.nih.gov/pmc/ articles/PMC18292...
Keywords: magnetoencephalography, perception, perceptual completion, visual cortex, HUMAN VISUAL-CORTEX, HUMAN BRAIN, CORTICAL ACTIVATION, BINOCULAR-RIVALRY, BLIND SPOT, RESPONSES, CONSCIOUSNESS, STIMULI, ATTENTION, CONTRAST
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Brain Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Brain Sciences > UCL Queen Square Institute of Neurology
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Brain Sciences > UCL Queen Square Institute of Neurology > Clinical and Movement Neurosciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Brain Sciences > UCL Queen Square Institute of Neurology > Neurodegenerative Diseases
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Life Sciences
URI: http://discovery.ucl.ac.uk/id/eprint/183425
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