When colour-contingent motion after-effects (MAEs) are induced with spirals that contain both colour and brightness contrast, the MAE is not apparent immediately after adaptation but does appear on a delayed test. However, when induced with stimuli that contain only colour contrast, the colour-contingent MAE is apparent immediately and decreases on a delayed test. The results are interpreted as indicating that units sensitive to brightness contrast can interfere with those that are sensitive to colour. It also seems necessary to modify or re-evaluate the fatigue theory of negative after-effects.
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