Document Detail

Use of an early nonlinearity to measure optical and receptor resolution in the human infant.
MedLine Citation:
PMID:  10615503     Owner:  NLM     Status:  MEDLINE    
We measured the resolution of the optics and receptoral processes in human infants. To do so, we recorded visual-evoked potentials (VEPs) to sampled sinewave gratings, stimuli that generate highly visible distortion products at a nonlinearity early in the retina. We varied the spatial frequency content of the stimulus to determine the frequencies that can be transmitted through the optics and receptors and thereby generate distortion products. Data were collected from adults and 2- to 7-month-old infants. The results indicated that the resolution of the infants' optical/receptoral processes was within a factor of two of adults' even at the earliest ages tested. These first stages of processing, therefore, do not explain infants' poor performance in many visual tasks, or restrict the types of visual stimuli affecting more central mechanisms that undergo experience-dependent development.
T R Candy; M S Banks
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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:  39     ISSN:  0042-6989     ISO Abbreviation:  Vision Res.     Publication Date:  1999 Oct 
Date Detail:
Created Date:  2000-01-24     Completed Date:  2000-01-24     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  0417402     Medline TA:  Vision Res     Country:  ENGLAND    
Other Details:
Languages:  eng     Pagination:  3386-98     Citation Subset:  IM    
School of Optometry, University of California at Berkeley, USA.
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MeSH Terms
Computer Graphics
Evoked Potentials, Visual / physiology*
Photoreceptor Cells, Vertebrate / physiology*
Psychological Tests
Sensory Thresholds / physiology*
Signal Detection, Psychological / physiology*
Visual Acuity / physiology*
Grant Support

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