A TEST OF LEVELT 2ND PROPOSITION FOR BINOCULAR-RIVALRY

Levelt's second proposition (1968) was tested by investigating the effect of increasing the stimulus strength on the ipsilateral mean dominance duration. In three experiments, three stimulus dimensions were investigated: luminance contrast, colour contrast, and motion velocity. We included an experiment similar to Levelt's own equipment, in which a reversed contrast stimulus was used. In all three experiments, including the Levelt disk-ring experiment, the proposition was rejected. We conclude that Levelt's proposition cannot always be generalized to a broad class of stimulus dimensions and therefore cannot be held against reciprocal inhibition models.