Document Detail

Prismatic displacement of vision induces transient changes in the timing of eye-hand coordination.
MedLine Citation:
PMID:  8414894     Owner:  NLM     Status:  MEDLINE    
Eye-hand coordination was investigated during a task of finger pointing toward visual targets viewed through wedge prisms. Hand and eye latencies and movement times were identical during the control condition and at the end of prism exposure. A temporal reorganization of eye and hand movements was observed during the course of adaptation. During the earlier stage of prism exposure, the time gap between the end of the eye saccade and the onset of hand movement was increased from a control time of 23 to 68 msec. This suggests that a time-consuming process occurred during the early prism-exposure period. The evolution of this time gap was correlated with the evolution of pointing errors during the early stage of prism exposure, in such a way that both measures increased at the onset of prism exposure and decreased almost back to control values within about 10 trials. However, spatial error was not entirely corrected, even late in prism exposure when the temporal organization of eye and hand had returned to baseline. These data suggest that two different adaptive mechanisms were at work: a rather short-term mechanism, involved in normal coordination of spatially aligned eye and hand systems, and a long-term mechanism, responsible for remapping spatially misaligned systems. The former mechanism can be strategically employed to quickly optimize accuracy in a situation involving misalignment, but completely adaptive behavior must await the slower-acting latter mechanism to achieve long-term spatial alignment.
Y Rossetti; K Koga; T Mano
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Perception & psychophysics     Volume:  54     ISSN:  0031-5117     ISO Abbreviation:  Percept Psychophys     Publication Date:  1993 Sep 
Date Detail:
Created Date:  1993-11-17     Completed Date:  1993-11-17     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  0200445     Medline TA:  Percept Psychophys     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  355-64     Citation Subset:  C; S    
Nagoya University, Japan.
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MeSH Terms
Eye Movements
Hand / physiology*
Motion Perception
Motor Skills
Ocular Physiological Phenomena*
Photic Stimulation
Reaction Time
Time Factors
Visual Perception / physiology*

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