Document Detail

Postural costs of suprapostural task load.
MedLine Citation:
PMID:  12967757     Owner:  NLM     Status:  MEDLINE    
In an immersive visualization experiment, participants performed a conjunction search task while standing either in open (heels 10 cm apart, feet at a comfortable angle) or closed stance (feet pressed together). In the world-frame condition, the search display maintained its position in space as the participant swayed, generating optic flow informative about sway. In the head-frame condition, the display maintained constant distance and orientation with respect to the participant's head, providing no visual information about sway. In both conditions, participants (surprisingly) searched faster while in the more difficult closed stance. Interpretation of this result is unclear. Participants also swayed more as search-load increased, and made more errors in the high search-load condition. It is suggested that this performance tradeoff is a result of the sharing of a limited-capacity, modality-non-specific spatial-attentional resource between postural and suprapostural tasks.
Suvobrata Mitra
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Human movement science     Volume:  22     ISSN:  0167-9457     ISO Abbreviation:  Hum Mov Sci     Publication Date:  2003 Aug 
Date Detail:
Created Date:  2003-09-11     Completed Date:  2004-02-06     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  8300127     Medline TA:  Hum Mov Sci     Country:  Netherlands    
Other Details:
Languages:  eng     Pagination:  253-70     Citation Subset:  IM    
Department of Psychology, Institute for Applied Cognitive Science, University of Warwick, Coventry CV4 7AL, UK.
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MeSH Terms
Attention / physiology
Fixation, Ocular
Posture / physiology*
Space Perception
Spatial Behavior
Visual Perception*

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