Linking quantal absorption rate to the visual response.

A photochemical system is proposed that offers a possible link between the rate of quantal absorption and the visual response. In the proposed system the time courses of the concentrations of certain photoproducts turn out to be equal to the quantal absorption rate passed through various linear filters. The proposed system is consistent with the cone pigment kinetics proposed by Rushton (1958). The system produces afterimages and can provide Weber's law behavior.