Document Detail

Wavelength discrimination at detection threshold.
MedLine Citation:
PMID:  2338595     Owner:  NLM     Status:  MEDLINE    
The experiments that we report aim to elucidate the linkage between cone outputs and color sensation. This is investigated by measuring wavelength discrimination between stimuli at threshold levels of detection. Stimuli are large spots (0.75 deg) presented on a white background. A 2 x 2 alternate forced choice method is used to measure simultaneously the detection of different wavelengths and discrimination between them. This method reveals at least four distinguishable colors, indicating the presence of four different sets of mechanisms at threshold. These are associated with the color sensations of orange, pale yellow, green, and blue. There is also evidence for a fifth imperfectly distinguished color (violet) in the shortest wavelength region. Results show that the boundaries between the distinguishable colors have little variation in their spectral positions. This is compatible with the presence of fixed perceptual boundaries in the spectrum dividing the different types of detection mechanism. The correspondence of the spectral locations of the distinguishable colors to the cone opponent responses revealed in the spectral sensitivity function suggests that these color sensations are postreceptoral in origin, arising from different combinations of the three cone outputs.
K T Mullen; J J Kulikowski
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Journal of the Optical Society of America. A, Optics and image science     Volume:  7     ISSN:  0740-3232     ISO Abbreviation:  J Opt Soc Am A     Publication Date:  1990 Apr 
Date Detail:
Created Date:  1990-06-21     Completed Date:  1990-06-21     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  8402086     Medline TA:  J Opt Soc Am A     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  733-42     Citation Subset:  IM    
Physiological Laboratory, Cambridge, UK.
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MeSH Terms
Color Perception / physiology*
Color Perception Tests
Photic Stimulation / instrumentation,  methods
Photoreceptor Cells / physiology*
Sensory Thresholds

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