A brightness matching procedure was used to measure the effect of wavelength and intensity of eliciting and test stimuli on spiral aftereffect. The results suggest that average rate of spiral aftereffect is a positive function of eliciting stimulus brightness and a negative function of test stimulus brightness. For 2 of 3 Ss, wavelength of the eliciting and test stimuli produced analogous results, with greater aftereffect resulting from a blue-eliciting stimulus than a red one. Conversely, less aftereffect resulted when a blue test stimulus was used. These results are interpreted within the framework of conventional physiological explanations of the effect.
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