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| Research article summary (published 27 Feb 2003): |
Visual awareness of low-contrast stimuli is reflected in event-related brain potentials.
Full Abstract
Visual awareness was studied in 11 subjects by using coherent and scrambled objects as stimuli. The stimuli were presented near the subjective perceptual threshold. Explicitly recognized stimuli elicited a specific negative ERP deflection peaking at 460 ms. Our reaction time experiment suggests that this visual awareness negativity (VAN) is similar to that found previously at a shorter latency. We propose that VAN might reflect the exact moment of becoming aware of the task-relevant stimulus properties and provide an online marker of the temporal dynamics of visual awareness.
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Author information
Author/s: Ojanen, Ville (V); Revonsuo, Antti (A); Sams, Mikko (M);
Affiliation: Laboratory of Computational Engineering, Helsinki University of Technology, Helsinki, HUT, Finland. viloja(-atsign-)lce.hut.fi
Journal and publication information
Publication Type: Clinical Trial; Journal Article; Research Support, Non-U.S. Gov't
Journal: Psychophysiology (Psychophysiology), published in United States. (Language: eng)
Reference: 2003-Mar; vol 40 (issue 2) : pp 192-7
Dates: Created 2003/06/24; Completed 2003/07/21; Revised 2006/11/15;
PMID: 12820860, 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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