Document Detail


Development of motion-specific cortical responses in infancy.
MedLine Citation:
PMID:  2017889     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
The development of visual motion mechanisms has been studied in infants with a visual evoked potential (VEP) technique which isolates responses from directionally-selective mechanisms. In adults, the amplitude of this directional VEP increased with velocity up to a maximum at 15-20 deg/sec, and then declined with further increases in velocity. In a group of infants tested longitudinally, directional responses were first found at a median age of 74 days with a stimulus velocity of 5 deg/sec, and 90 days with a velocity of 20 deg/sec; this age difference was statistically significant. Initially, VEP amplitudes were significantly greater at 5 deg/sec than at 20 deg/sec. By the end of the longitudinal study, there was no significant difference in amplitudes at the two velocities. In a second group of infants, simultaneous recording of VEPs and electrooculograms indicated that eye movements tracking the stimulus were not a significant factor in the development of the directional VEP. It is concluded that the development of directional selectivity starts at low velocities, and extends to higher velocities with age.
Authors:
J Wattam-Bell
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Vision research     Volume:  31     ISSN:  0042-6989     ISO Abbreviation:  Vision Res.     Publication Date:  1991  
Date Detail:
Created Date:  1991-05-17     Completed Date:  1991-05-17     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0417402     Medline TA:  Vision Res     Country:  ENGLAND    
Other Details:
Languages:  eng     Pagination:  287-97     Citation Subset:  IM    
Affiliation:
Department of Experimental Psychology, University of Cambridge, U.K.
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MeSH Terms
Descriptor/Qualifier:
Adult
Electrooculography
Evoked Potentials, Visual / physiology*
Humans
Infant
Longitudinal Studies
Motion Perception / physiology*
Pattern Recognition, Visual / physiology
Reaction Time
Saccades / physiology
Visual Cortex / physiology

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


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