Andrew Stockman studied human cone spectral sensitivities. Measurements in observers with known genotype connect psychophysical responses with variation in the photoreceptor system. Estimating a sensitivity function requires distinguishing receptor responses from later visual processing and from the spectrum of the measuring stimulus. [ref]
The spectral sensitivities of the middle- and long-wavelength-sensitive cones derived from measurements in observers of known genotype by Andrew Stockman and others. 2000, known-genotype observers and cone-sensitivity estimation
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