Document Detail

How perceived egocentric distance varies with changes in tonic vergence.
MedLine Citation:
PMID:  22623089     Owner:  NLM     Status:  MEDLINE    
According to the eye muscle potentiation (EMP) hypothesis, sustained vergence leads to changes in egocentric perceived distance. This perceptual effect has been attributed to a change in the resting or tonic state of vergence. The goal of the present study was to test the EMP hypothesis by quantifying the relationship between prism-induced changes in tonic vergence and corresponding changes in perceived distance and by measuring the dynamics of changes in perceived distance. During a 10-min exposure to 5-diopter base-out prisms that increased the vergence demand, thirteen right-handed subjects pointed to visual targets located within reaching space using their left hand, without visual feedback. Pre- and post-exposure tests assessed tonic vergence through phoria measurements and egocentric distance estimate through pointing to visual targets with each hand successively, without visual feedback. Similar distance aftereffects were observed for both hands, although only the left hand was used during exposure, indicating that these aftereffects are mediated by visual processes rather than by visuomotor interactions. The distance aftereffects were significantly correlated with prism-induced changes in phoria, demonstrating a relationship between perceived distance and the level of tonic vergence. Changes in perceived distance increased monotonically across trials during prism exposure and remained stable during the post-test, indicating a long time constant for these perceptual effects, consistent with current models of the vergence control system. Overall, these results support the hypothesis that vergence plays a role in reduced-cue distance perception. They further illustrate that variations in tonic vergence influence perceived distance by altering the sensed vergence effort.
Anne-Emmanuelle Priot; Pascaline Neveu; Olivier Sillan; Justin Plantier; Corinne Roumes; Claude Prablanc
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2012-05-24
Journal Detail:
Title:  Experimental brain research     Volume:  219     ISSN:  1432-1106     ISO Abbreviation:  Exp Brain Res     Publication Date:  2012 Jun 
Date Detail:
Created Date:  2012-06-04     Completed Date:  2013-04-01     Revised Date:  2013-12-13    
Medline Journal Info:
Nlm Unique ID:  0043312     Medline TA:  Exp Brain Res     Country:  Germany    
Other Details:
Languages:  eng     Pagination:  457-65     Citation Subset:  IM    
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MeSH Terms
Distance Perception / physiology*
Eye Movements / physiology*
Photic Stimulation / methods*
Psychomotor Performance / physiology*
Young Adult

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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