Document Detail


Spatiotemporal factors in infant position sensitivity: single bar stimuli.
MedLine Citation:
PMID:  1455747     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
The ability of 3-month-old human infants to detect the presence of spatial misalignments in single-bar stimuli was investigated in a series of spatiotemporal stimulus manipulations. Both discrete and sinusoidal positional offsets, either stationary or temporally modulated, were presented using the forced-choice preferential looking technique. When discrete offsets were presented in alteration with the absence of offsets, thresholds were a factor of two worse than previous estimates of infant vernier acuity using grating stimuli. However, when offsets (discrete or sinusoidal) were presented in continuous motion, mean threshold was 22-24 arcmin, comparable to previous estimates using gratings with moving discrete offsets. For stimuli containing continuous motion, lowering velocity reduced infants' positional sensitivity. However, when either velocity or temporal frequency was held constant, the most important determinant of positional sensitivity was the sharpness of the offsets. The results from the temporally-modulated stimuli suggest that a simple local flicker mechanism cannot account for sensitivity when continuous motion is used in the stimulus; rather, a local motion mechanism may govern sensitivity in these conditions. We characterize this mechanism as one of "local motion" because it does have a position-sensitive component. The two stationary stimulus conditions in the present study indicate that infants can use a position-sensitive mechanism when no temporal modulation is present.
Authors:
A M Skoczenski; R N Aslin
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  Vision research     Volume:  32     ISSN:  0042-6989     ISO Abbreviation:  Vision Res.     Publication Date:  1992 Sep 
Date Detail:
Created Date:  1992-12-31     Completed Date:  1992-12-31     Revised Date:  2007-11-14    
Medline Journal Info:
Nlm Unique ID:  0417402     Medline TA:  Vision Res     Country:  ENGLAND    
Other Details:
Languages:  eng     Pagination:  1761-9     Citation Subset:  IM    
Affiliation:
Center for Visual Science, University of Rochester, NY 14627.
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MeSH Terms
Descriptor/Qualifier:
Humans
Infant
Motion Perception / physiology
Sensory Thresholds / physiology
Space Perception / physiology*
Time Factors
Visual Acuity / physiology
Grant Support
ID/Acronym/Agency:
EY-01319/EY/NEI NIH HHS; HD-20286/HD/NICHD NIH HHS

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


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