NDLI: Perceptual-Attentional and Motor-Intentional Bias in Near and Far Space

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Perceptual-Attentional and Motor-Intentional Bias in Near and Far Space

Content Provider	PubMed Central
Author	Garza, John P. Eslinger, Paul J. Barrett, Anna M.
Abstract	Spatial bias demonstrated in tasks such as line-bisection may stem from perceptual-attentional (PA) “where” and motor-intentional (MI) “aiming” influences. We tested normal participants’ line bisection performance in the presence of an asymmetric visual distracter with a video apparatus designed to dissociate PA from MI bias. An experimenter stood as a distractor to the left or right of a video monitor positioned in either near or far space, where participants viewed lines and a laser point they directed under 1) natural and 2) mirror-reversed conditions. Each trial started with the pointer positioned at either the top left or top right corner of the screen, and alternated thereafter. Data analysis indicated that participants made primarily PA leftward errors in near space, but not in far space. Furthermore, PA, but not MI, bias increased bilaterally in the direction of distraction. In contrast, MI, but not PA, bias was shifted bilaterally in the direction of startside. Results support the conclusion that a primarily PA left sided bias in near space is consistent with right hemisphere spatial attentional dominance. A bottom-up visual distractor specifically affected PA “where” spatial bias while top-down motor cuing influenced MI “aiming” bias.
Related Links	http://dx.doi.org/10.1016/j.bandc.2008.02.006
Ending Page	14
Page Count	6
Starting Page	9
File Format	PDF
ISSN	02782626
e-ISSN	10902147
Journal	Brain and cognition
Issue Number	1
Volume Number	68
Language	English
Publisher Date	2008-10-01
Access Restriction	Open
Subject Keyword	Experimental and Cognitive Psychology Cognitive Neuroscience Neuropsychology and Physiological Psychology Research in Higher Education
Content Type	Text
Resource Type	Article
Subject	Experimental and Cognitive Psychology Arts and Humanities Cognitive Neuroscience Developmental and Educational Psychology Neuropsychology and Physiological Psychology

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