title: Extending Levelt's Propositions to perceptual multistability involving interocular grouping.
abstract: Levelt's Propositions are central to understanding a wide range of multistable perceptual phenomena, but it is unclear whether they extend to perceptual multistability involving interocular grouping. We presented split-grating stimuli with complementary halves of the same color (either red or green) to human subjects. The subjects reported four percepts in alternation: the two stimuli presented to each eye (half red and half green), as well as the two single color (all red or all green), interocularly grouped percepts. Increasing color saturation lead to increased reports of the single color percept in most subjects, indicating increased predominance of grouped percepts (Levelt's Proposition I). This increase in predominance was due to a decrease in the average dominance duration of single-eye percepts, with grouped percept dominance largely unaffected. This agrees with a generalization of Levelt's Proposition II, as the average dominance duration of the stronger (in this case single-eye) percept was primarily affected by changes in stimulus strength. Moreover, in agreement with Levelt's Proposition III the alternation rate between percepts increased as the difference in the strength of the percepts decreased.
authors.affiliation: Dept. of Electrical & Computer Engineering, University of Houston, Houston, TX 77204, USA; Dept. of Anesthesia, Lausanne University Hospital, Lausanne, Switzerland.
authors.forename: Alain
authors.initials: A
authors.lastname: Jacot-Guillarmod
authors.affiliation: Dept. of Mathematics, Texas Southern University, Houston, TX 77004, USA.
authors.forename: Yunjiao
authors.initials: Y
authors.lastname: Wang
authors.affiliation: Center for Clinical Research and Evidence-Based Medicine, McGovern Medical School at The University of Texas Health Science Center at Houston, Houston, TX 77030, USA.
authors.forename: Claudia
authors.initials: C
authors.lastname: Pedroza
authors.affiliation: Dept. of Electrical & Computer Engineering, University of Houston, Houston, TX 77204, USA; Dept. of Electrical & Computer Engineering, University of Denver, Denver, CO 80208, USA.
authors.forename: Haluk
authors.initials: H
authors.lastname: Ogmen
authors.affiliation: Dept. of Mathematics, University of Houston, Houston, TX 77204, USA; Dept. of Applied Mathematics, University of Colorado, Boulder, CO 80309, USA; Dept. of Physiology & Biophysics, University of Colorado School of Medicine, Aurora, CO 80045, USA. Electronic address: zpkilpat@colorado.edu.
authors.forename: Zachary
authors.initials: Z
authors.lastname: Kilpatrick
authors.affiliation: Dept. of Mathematics, University of Houston, Houston, TX 77204, USA; Dept. of Biology and Biochemistry, University of Houston, Houston, TX 77204, USA; Dept. of Biosciences, Rice University, Houston, TX 77251, USA. Electronic address: josic@math.uh.edu.
authors.forename: Krešimir
authors.initials: K
authors.lastname: Josić
mesh_terms: D000328:Adult; D003118:Color Perception / Q000502:physiology*; D023882:Dominance, Ocular / Q000502:physiology*; D005260:Female; D007839:Functional Laterality; D006801:Humans; D008297:Male; D008962:Models, Theoretical; D015348:Vision, Binocular / Q000502:physiology; D014796:Visual Perception / Q000502:physiology*
keywords: Interocular grouping; Levelt’s Propositions; Multistable perceptual rivalry