Document Detail

Development of motion-specific cortical responses in infancy.
MedLine Citation:
PMID:  2017889     Owner:  NLM     Status:  MEDLINE    
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.
J Wattam-Bell
Related Documents :
16137739 - Motion- and orientation-specific cortical responses in infancy.
10321469 - Cortical responses of infants with and without a genetic risk for dyslexia: ii. group e...
2094539 - Facial expressions of neonate infants in response to gustatory stimuli.
11201319 - Evidence on the efficacy of insert earphone and sound field vra with young infants.
8345959 - Development of vision in infants and young children.
2017889 - Development of motion-specific cortical responses in infancy.
12334589 - Population and health.
18363949 - Osteopenia of prematurity: a national survey and review of practice.
12512639 - Acoustic analyses of developmental changes and emotional expression in the preverbal vo...
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    
Department of Experimental Psychology, University of Cambridge, U.K.
Export Citation:
APA/MLA Format     Download EndNote     Download BibTex
MeSH Terms
Evoked Potentials, Visual / physiology*
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

Previous Document:  Using metamers to explore motion perception.
Next Document:  Different effects from spatial frequency masking in texture segregation and texton detection tasks.