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| Research article summary (published 30 Dec 2002): |
Feature-specific electrophysiological correlates of texture segregation.
Full Abstract
Discrimination between a figure and its surround is an important first step of pattern recognition. This discrimination usually relies, as a first step, on the detection of borders between a figure and its surround, for example based on spatial gradients in luminance, colour, or texture. There is evidence that neurones in the visual cortex are specifically activated by segregation between textures, but the relation between segregation based on different types of features such as colour, luminance, and motion is unclear. Evoked EEG potentials specific to texture segregation were investigated in 17 observers in two separate experiments and by means of functional magnetic resonance imaging in a separate study (Fahle et al., in preparation). Differences in either luminance, colour, line orientation, motion, or stereoscopic depth defined a checkerboard pattern. Patterns defined by each of these features elicited segregation-specific potentials. In contrast to earlier reports (Vision Research 37 (1997) 1409), however, we find pronounced differences between the segregation-specific potentials evoked through different features, especially regarding their peak latencies. The topographical distribution of the activity evoked reveals different polarities and partly specific locations for different stimulus features, indicating the existence of different processors for texture segregation based on different features.Copyright 2002 Elsevier Science Ltd.
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Author information
Author/s: Fahle, M (M); Quenzer, T (T); Braun, C (C); Spang, K (K);
Affiliation: Department of Human Neurobiology, Center for Cognitive Science, University of Bremen, Argonnenstrasse 3, D 28211 Bremen, Germany. mfahle(-atsign-)uni-bremen.de
Journal and publication information
Publication Type: Journal Article; Research Support, Non-U.S. Gov't
Journal: Vision research (Vision Res), published in England. (Language: eng)
Reference: 2003-Jan; vol 43 (issue 1) : pp 7-19
Dates: Created 2002/12/30; Completed 2003/04/07; Revised 2006/11/15;
PMID: 12505600, status: MEDLINE (last retrieval date: 11/6/2008)
Sourced from the National Library of Medicine. Abstract text and other information may be subject to copyright.
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