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| Research article summary (published 29 Nov 2002): |
Non-spatial attentional effects on P1.
Full Abstract
OBJECTIVE:
It has been suggested that P1, the earliest endogenous visual potential, is influenced primarily by spatial location. However, we have found that attention to non-spatial visual features can affect both the latency and amplitude of this component.
METHODS:
A series of studies are reviewed, starting with 4 using simple geometric forms, and either serial presentation of single stimuli or presentation of stimulus arrays followed by two studies using natural complex images.
RESULTS:
With simple stimuli, latency and amplitude effects are seen on the P1, but differ among the paradigms, depending on the demands of the task. The data further showed a facilitation effect and that binding occurs in parallel with single feature processing. For complex stimuli we found P1 shorter to faces than inverted faces, eyes or non-face stimuli, and larger to animal than non-animal pictures. The above effects were present in children as well as in adults.
CONCLUSIONS:
These findings demonstrate that very early stages of processing can be modified by top-down attentional influences across a range of ages and experimental paradigms, concordant with visual processing models showing very rapid and dispersed activation with feedback at early cortical levels.
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Author information
Author/s: Taylor, Margot J (MJ);
Affiliation: Cerveau et Cognition (CerCo-CNRS UMR 5549), Université Paul Sabatier, Faculté de Médecine de Rangueil, 133, route de Narbonne, 31062 Toulouse, France. taylor(-atsign-)cerco.ups-tlse.fr
Journal and publication information
Publication Type: Journal Article; Review
Journal: Clinical neurophysiology : official journal of the International Federation of Clinical Neurophysiology (Clin Neurophysiol), published in Netherlands. (Language: eng)
Reference: 2002-Dec; vol 113 (issue 12) : pp 1903-8
Dates: Created 2002/12/04; Completed 2003/02/11; Revised 2008/09/10;
PMID: 12464327, 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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