Early processing in the human lateral occipital complex is highly responsive to illusory contours but not to salient regions.

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Serval ID
serval:BIB_3662A6733D8F
Type
Article: article from journal or magazin.
Collection
Publications
Institution
Title
Early processing in the human lateral occipital complex is highly responsive to illusory contours but not to salient regions.
Journal
The European journal of neuroscience
Author(s)
Shpaner M., Murray M.M., Foxe J.J.
ISSN
1460-9568 (Electronic)
ISSN-L
0953-816X
Publication state
Published
Issued date
11/2009
Peer-reviewed
Oui
Volume
30
Number
10
Pages
2018-2028
Language
english
Notes
Publication types: Journal Article ; Research Support, N.I.H., Extramural ; Research Support, Non-U.S. Gov't
Publication Status: ppublish
Abstract
Human electrophysiological studies support a model whereby sensitivity to so-called illusory contour stimuli is first seen within the lateral occipital complex. A challenge to this model posits that the lateral occipital complex is a general site for crude region-based segmentation, based on findings of equivalent hemodynamic activations in the lateral occipital complex to illusory contour and so-called salient region stimuli, a stimulus class that lacks the classic bounding contours of illusory contours. Using high-density electrical mapping of visual evoked potentials, we show that early lateral occipital cortex activity is substantially stronger to illusory contour than to salient region stimuli, whereas later lateral occipital complex activity is stronger to salient region than to illusory contour stimuli. Our results suggest that equivalent hemodynamic activity to illusory contour and salient region stimuli probably reflects temporally integrated responses, a result of the poor temporal resolution of hemodynamic imaging. The temporal precision of visual evoked potentials is critical for establishing viable models of completion processes and visual scene analysis. We propose that crude spatial segmentation analyses, which are insensitive to illusory contours, occur first within dorsal visual regions, not the lateral occipital complex, and that initial illusory contour sensitivity is a function of the lateral occipital complex.

Keywords
Adult, Brain Mapping, Electroencephalography/methods, Evoked Potentials, Visual/physiology, Female, Form Perception/physiology, Humans, Image Processing, Computer-Assisted/methods, Magnetic Resonance Imaging/methods, Male, Occipital Lobe/blood supply, Occipital Lobe/physiology, Optical Illusions/physiology, Oxygen/blood, Pattern Recognition, Visual/physiology, Photic Stimulation/methods, Reaction Time/physiology, Young Adult
Pubmed
Web of science
Create date
04/12/2009 10:10
Last modification date
20/08/2019 13:24
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