Chromatic adaptation to moving stimuli

Colour vision is generally investigated with static stimuli. However, under `real viewing' condi- tions, colour is, of course, often seen in combination with motionöwhere movement is relative to the observer. In this experiment, I investigated the implementation of chromatic adaptation during motion. The monochromatic test patterns were produced on a colour monitor and consisted of a 2 deg62 deg test patch (ltest ˆ 19:3 cd mÿ2 ), in front of a checkerboard back- ground (20 deg620 deg; l1 ˆ 28:3 cd mÿ2; l2 ˆ 10:3 cd mÿ2 ). Chromatic adaptation was meas- ured for the transition from D65 adaptation (u 0 ˆ 0:197, v 0 ˆ 0:468) to a green adaptation light (u 0 ˆ 0:166, v 0 ˆ 0:472; tadapt ˆ 5 s). The effect of chromatic adaptation was measured by a hue-cancellation technique for the achromatic appearance of the test patch. Four conditions were tested: (i) test patch and background static; (ii) test patch moving, background static; (iii) background moving, test patch static; (iv) test patch and background moving. Velocity of motion in all experiments was constant at 0.04 msÿ1. It was found that (i) motion of the stimuli per se did not impair chromatic adaptation, and (ii) relative motion, but not motion of the stimuli per se, facilitated adaptation significantly ( p 5 0:01). The results indicate specific interactions co-processing of colour and motion signals in the cortex