Levelt's laws do not predict perception when luminance- and contrast-modulated stimuli compete during binocular rivalry.

The mean exclusivity duration of the LM stimulus did decrease, as predicted, when its visibility level is reduced (1.3 ± 0.2 s to 0.9 ± 0.6 s, LM (43x) to LM (2x), respectively), although this trend did not reach statistical significance [F(1,9) = 0.7, p > 0.05].

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