Relative quantum catches for horse photoreceptors

Seven shades of green and five shades of blue were tested and the relative quantum catches for the long wavelength-sensitive (LWS) cone type and rods were calculated according to Eqn. 1. These values were used to make sure that brightness of the colour stimuli were comparable for the horse. Relative quantum catches of the short wavelength-sensitive (SWS) cone type is included for comparison.