The increment threshold paradigm is useful when one wishes to selectively measure the sensitivity of one or more of the cone receptors. For example, suppose you wanted to measure the spectral sensitivity of a normal visual system as if it were missing the short wavelength receptors. To accomplish this task an investigator would perform increment thresholds against a very bright blue background. This background would adapt the short wavelength sensitive cones thereby reducing their sensitivity.
Measuring Spectral Sensitivity
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