Document Detail

Early unilateral enucleation disrupts motion processing.
MedLine Citation:
PMID:  11804638     Owner:  NLM     Status:  MEDLINE    
Previous research has shown that unilaterally enucleated observers demonstrate better luminance-defined form perception compared to monocularly viewing controls, and similar performance to control observers viewing binocularly (Vision Res. 37(17) (1997) 2465). In Experiment 1 we asked whether the perception of form, where form is defined by other attributes than luminance, is also improved compared to monocularly viewing controls. We tested 16 enucleated observers and 25 controls viewing monocularly and binocularly for their ability to detect and recognize form from texture (texture-defined (TD) form) and form from motion (motion-defined (MD) form). There was no difference between the three groups for TD form perception. However, enucleated observers had significantly poorer MD form perception than did binocularly viewing controls. In Experiment 2 we asked whether poor performance on the perception of MD form might be due to a general reduction in motion processing abilities. To examine this possibility, we used a motion coherence task. We tested eight unilaterally enucleated and 14 monocularly and binocularly viewing control observers on a horizontal coherent motion discrimination task. The monocularly viewing controls showed no naso-temporal asymmetry in direction discrimination for coherent motion. In contrast, the enucleated group showed an asymmetry in direction discrimination where temporalward motion coherence thresholds were significantly higher than those for nasalward motion. These latter findings are discussed in terms of the absence of binocular competition during the development of motion processing pathways.
Jennifer K E Steeves; Esther G González; Brenda L Gallie; Martin J Steinbach
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Vision research     Volume:  42     ISSN:  0042-6989     ISO Abbreviation:  Vision Res.     Publication Date:  2002 Jan 
Date Detail:
Created Date:  2002-01-23     Completed Date:  2002-03-11     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0417402     Medline TA:  Vision Res     Country:  England    
Other Details:
Languages:  eng     Pagination:  143-50     Citation Subset:  IM    
Imaging Research Laboratories, The John P. Robarts Research Institute, London, Ontario, Canada N6A 5K8.
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MeSH Terms
Analysis of Variance
Case-Control Studies
Discrimination (Psychology) / physiology
Eye Enucleation / adverse effects*
Form Perception / physiology
Middle Aged
Motion Perception / physiology*
Vision, Binocular / physiology
Vision, Monocular / physiology

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

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