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Substantial evidence supports the hypothesis that visual detection in the presence of masking noise occurs at a constant signal/noise ratio only if the subject is unfamiliar with the mask. A variety of studies of the proposed sustained/transient mechanism model have failed to find support for a dichotomous visual system, and have failed to replicate some of the classical studies in this area. Studies of hypothetical velocity-tuned channels suggest the possible existence of such channels, but show that they are, at best, mixed in their tuning properties. Weisstein'g Pixel Flicker technique has been found to be an artifact of an unrealistic algorithm for adding noise to a visual scene. Other temporal enhancement schemes show some promise.