Scenarios for parametric dependence of perceptual dominance.

<p>Schematic diagrams illustrate how the mean percept durations may change as a stimulus parameter S is varied and dominance shifts gradually from percept 1 to percept 2. The upper row illustrates the weaker percept being affected more and the lower row the stronger percept being affected more. <b>A,D</b>: Proportion of time when percept 1 is dominant decreases monotonically through equidominance (0.5) (dashed lines) in both scenarios. When <i>S</i> < <i>S</i>_eq percept 1 is stronger, when <i>S</i> > <i>S</i>_eq percept 2 is stronger. <b>B,E</b>: Percept durations are equal (<i>T</i>₁ = <i>T</i>₂ = <i>T</i>_eq) at equidominance (<i>S</i> = <i>S</i>_eq) in both scenarios. When the weaker percept is affected more the lower branches decrease more on either side of equidominance (<b>B</b>). When the stronger percept is affected more the upper branches increase more on either side of equidominance (<b>E</b>). <b>C,F</b>: The measure <i>η</i> (defined by <a href="http://www.ploscompbiol.org/article/info:doi/10.1371/journal.pcbi.1004555#pcbi.1004555.e011" target="_blank">Eq (3)</a>) is zero at equidominance (<i>S</i> = <i>S</i>_eq) for both scenarios. It decreases on either side of equidominance when the weaker percept is affected more (<b>C</b>) and increases on either side of equidominance when the stronger percept is affected more (<b>F</b>).