Document Detail


Deficiencies in human neonates' color vision: photoreceptoral and neural explanations.
MedLine Citation:
PMID:  1867752     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Several photoreceptoral and neural models have been proposed to account for the development of human vision. To further evaluate those applicable to color vision, the present study examined 40 neonates' (mean age = 3.2 days) chromatic-achromatic discriminations in the mid-spectral region by using an habituation procedure and measures to minimize achromatic cues. Results indicated that newborns showed evidence of discriminating broad-band orange (lambda peak = 595 nm) but not yellow-green (lambda peak = 565 nm) lights from achromatic lights of varying luminance. Collectively, these and previous results imply that although newborns have at least dichromatic color vision, they possess relatively poor chromatic-achromatic discrimination in two spectral regions - in the short-wavelengths (including stimuli of 470-480 nm) and in the mid-wavelengths (including 565 nm). Although several hypotheses were considered, newborns' chromatic 'neutral zones' are best accounted for by models proposing that early color vision is limited by a general inefficiency of preneural (photoreceptoral and optical) mechanisms and/or by a selective immaturity of the SWS cones or the B/Y opponent channel.
Authors:
R J Adams; M L Courage; M E Mercer
Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Behavioural brain research     Volume:  43     ISSN:  0166-4328     ISO Abbreviation:  Behav. Brain Res.     Publication Date:  1991 May 
Date Detail:
Created Date:  1991-09-13     Completed Date:  1991-09-13     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  8004872     Medline TA:  Behav Brain Res     Country:  NETHERLANDS    
Other Details:
Languages:  eng     Pagination:  109-14     Citation Subset:  IM    
Affiliation:
Department of Psychology, Memorial University of Newfoundland, St. John's, Canada.
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MeSH Terms
Descriptor/Qualifier:
Arousal / physiology
Attention / physiology
Color Perception / physiology*
Female
Geniculate Bodies / physiology
Humans
Infant, Newborn / physiology*
Male
Neurons / physiology
Optic Nerve / physiology*
Photoreceptor Cells / physiology*
Visual Cortex / physiology
Visual Pathways / physiology

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


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