Document Detail

Development of psychophysically-derived detection contours in L- and M-cone contrast space.
MedLine Citation:
PMID:  11369043     Owner:  NLM     Status:  MEDLINE    
In order to investigate the development of color mechanisms in infants we fitted elliptical detection contours to psychophysically-derived contrast thresholds plotted in L- and M-cone contrast space. Detection ellipses were obtained for 47 infants (ages 2-5 months of age), and were compared to those of six adults tested under nearly identical conditions. The parameters of the fitted ellipses allowed us to address several aspects of color development. First, the lengths and widths were used to assess the relative development of chromatic, with respect to luminance, sensitivity. The results of these analyses revealed a sharp increase in chromatic sensitivity between 3 and 4 months of age, suggesting an accelerated development of chromatic mechanisms around this time. Second, the angles of the ellipses provided estimates of individual red/green isoluminance points. In line with previous reports, we found that isoluminance points do not vary significantly with age. Finally, our ellipse-fitting procedures were used to assess whether color sensitivity is best described by a model that assumes independence between post-receptoral chromatic and luminance mechanisms. Similar to previous results of Kelly and Chang [Kelly, J. P. & Chang, S. (2000). Vision Research 40, 1887-1906] obtained using steady-state visually evoked potentials, only a proportion (approximately half) of our infants exhibited detection contours that were consistent with independent mechanisms, a finding that most likely results from statistical noise in the infant data sets.
K R Dobkins; C M Anderson; J Kelly
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Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  Vision research     Volume:  41     ISSN:  0042-6989     ISO Abbreviation:  Vision Res.     Publication Date:  2001 Jun 
Date Detail:
Created Date:  2001-05-22     Completed Date:  2001-06-21     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  0417402     Medline TA:  Vision Res     Country:  England    
Other Details:
Languages:  eng     Pagination:  1791-807     Citation Subset:  IM    
Department of Psychology, 0109, University of California, San Diego, La Jolla, CA 92093, USA.
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MeSH Terms
Child Development / physiology*
Color Perception / physiology*
Contrast Sensitivity / physiology*
Differential Threshold
Motion Perception / physiology
Retinal Cone Photoreceptor Cells / physiology*
Grant Support

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