S. Schaerer et C. Neumeyer, MOTION DETECTION IN GOLDFISH INVESTIGATED WITH THE OPTOMOTOR RESPONSEIS COLOR-BLIND, Vision research, 36(24), 1996, pp. 4025-4034
The action spectrum of the optomotor response in goldfish was measured
to investigate which of the four cone types involved in color vision
contributes to motion detection, In the dark-adapted state, the action
spectrum showed a single maximum in the range of 500-520 nm, and rese
mbled the rod spectral sensitivity function. Surprisingly, the action
spectrum measured in the light-adapted state also revealed a single ma
ximum only, located in the long wavelength range between 620 and 660 n
m, A comparison with spectral sensitivity functions of the four cone t
ypes suggests that motion detection is dominated by the L-cone type, U
sing a two colored, ''red-green'' cylinder illuminated with two monoch
romatic lights separately adjustable in intensity, it could be shown t
hat motion vision is ''color-blind'': the optomotor response disappear
ed whenever ''isoluminant'' red and green stripes were offered. Under
this condition, calculations revealed that the L-cones were only sligh
tly modulated by the ''red-green'' stimulus. Copyright (C) 1996 Elsevi
er Science Ltd.