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An interpretation of masking by light in terms of the sustained-transient dichotomy is presented. It is proposed that presentation of a uniform flash has two effects: a masking effect, which occurs within the transient system, and a facilitation effect due to increased adaptation level. These two components have been separated by the employment of uniform flashes (flicker around a mean luminance) that do not change adaptation level. Results of such studies generally suggest that masking by light occurs only when targets are detected by the transient system. However, not aU results are consistent with the sustained-transient model. Reexamination of other recent literature reveals that the motion/pattern dichotomy underlying the model is not tenable. Moreover, other evidence appears to refute the view that the sustained system dominates fovea vision while the transient system is more responsive in the periphery. I suggest a modified version of the dichotomy and propose a simple receptive field model of sustained and transient mechanisms.

Masking by light and the sustained-transient dichotomy