Abstract：
:We investigated the manner in which the outputs of the three postreceptoral mechanisms (red-green, blue-yellow and luminance) combine to determine contrast threshold. We used a subthreshold summation paradigm to test whether the combination of the postreceptoral mechanism outputs could be described by a probability summation model which assumes stochastic independence of the mechanisms, and determined the best fitting summation exponent. Stimuli were Gaussian enveloped 1 c/d sinusoidal gratings represented in a 3D cardinal space transformed from cone contrast axes, and normalized to detection threshold. The use of this space avoids the presence of elongated threshold contours, allowing a reliable model fit to include the less sensitive blue-yellow and luminance mechanisms. Our results were well fitted by the probability summation model and hence support the underlying stochastic independence of the three postreceptoral mechanisms.
journal_name
Vision Resjournal_title
Vision researchauthors
Mullen KT,Sankeralli MJdoi
10.1016/s0042-6989(98)00137-0subject
Has Abstractpub_date
1999-02-01 00:00:00pages
733-45issue
4eissn
0042-6989issn
1878-5646pii
S0042698998001370journal_volume
39pub_type
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