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| Research article summary (published 30 Jul 2002): |
Deformation of the useful visual field with state of vigilance, task priority, and central task complexity.
Full Abstract
In a dual-task situation, peripheral perception can deteriorate due to different variables related to the experimental situation, such as central task complexity and the relative priority given to the two tasks. Recent studies have also shown that individual characteristics (such as the state of vigilance) can alter the useful visual field. The ability to perceive signals presented at different places in the visual field decreases in situations that lead to episodes of low vigilance. In Exp. 1, 27 subjects (18-29 years) had to perform a monotonous and prolonged dual-monitoring task involving central and peripheral vision. The test was carried out with two different sets of instructions regarding priority:
the more important task was either the central task or the peripheral one. In Exp. 2, 18 subjects (18-30 years) performed the same test, but this time with two levels of complexity of the central task, either a simple monitoring activity or the same monitoring task coupled with a counting activity. Elliptical interpolation of the data enabled assessment of the deformation of the useful visual field in both experiments. The analysis of the parameters of the elliptical model indicated that the useful visual field mainly shrinks on the vertical axis, as the individual becomes drowsy. The useful visual field also shrinks on the horizontal axis when the peripheral task has priority and the monitoring activity is prolonged, or when the central task is complex.
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Author information
Author/s: Rogé, Joceline (J); Kielbasa, Laetitia (L); Muzet, Alain (A);
Affiliation: CEPA Centre d'Etudes de Physiologie Appliquée CNRS UPS 858, 21 rue Becquerel, 67087 Strasbourg. joceline.roge(-atsign-)c-strasbourg.fr
Journal and publication information
Publication Type: Journal Article
Journal: Perceptual and motor skills (Percept Mot Skills), published in United States. (Language: eng)
Reference: 2002-Aug; vol 95 (issue 1) : pp 118-30
Dates: Created 2002/10/07; Completed 2003/02/13; Revised 2004/11/17;
PMID: 12365246, 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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