Document Detail

Visually guided movements to color targets.
MedLine Citation:
PMID:  16733702     Owner:  NLM     Status:  MEDLINE    
The pathways controlling motor behavior are believed to exhibit little selectivity for color, but there is growing evidence suggesting that color signals can be used to guide actions. We investigated this by having observers make a saccade or a rapid pointing movement to a small, peripherally flashed (100 ms) Gaussian target (SD=0.5 degrees) defined exclusively by luminance (maximum contrast) or color (from cardinal DKL red-green or blue-yellow axes, at maximum saturation). We found no difference in saccadic or pointing accuracy for luminance or color targets. The same was true using shutter goggles during pointing (to minimize the use of external cues), and when the luminance contrast of color targets was varied by up to +/-10%. In terms of response times, both eye and hand latencies increased with target eccentricity for R-G targets only, in a manner consistent with the sensitivity of this channel across eccentricity. We found little difference in response latencies between luminance and color targets once matched in terms of cone contrast. While RTs were longer when coupled with a goal directed pointing movement (versus a simple reaction without pointing), the difference was the same for color or luminance targets, suggesting that the spatial coding for the movements was also the same. In a final experiment we compared the accuracy of pointing to color-naming performance in a 4AFC procedure. The psychometric functions relating pointing accuracy (% correct quadrant) to color-naming (% correct color-name) were identical. Taken together, the results show that human observers can efficiently use pure chromatic signals to guide actions.
Brian J White; Dirk Kerzel; Karl R Gegenfurtner
Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2006-05-30
Journal Detail:
Title:  Experimental brain research     Volume:  175     ISSN:  0014-4819     ISO Abbreviation:  Exp Brain Res     Publication Date:  2006 Oct 
Date Detail:
Created Date:  2006-10-10     Completed Date:  2007-10-02     Revised Date:  2013-12-13    
Medline Journal Info:
Nlm Unique ID:  0043312     Medline TA:  Exp Brain Res     Country:  Germany    
Other Details:
Languages:  eng     Pagination:  110-26     Citation Subset:  IM    
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MeSH Terms
Analysis of Variance
Attention / physiology*
Color Perception / physiology*
Contrast Sensitivity / physiology*
Eye Movements / physiology*
Photic Stimulation / methods
Reaction Time / physiology
Vision, Ocular / physiology*

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