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What is salient in binocular rivalry

What is salient in binocular rivalry. Fumihiko Taya* and Ken Mogi**, *Department of Physiology1, Osaka University Medical School **Sony Computer Science Laboratory. Abstract. We studied what stimulus features count as salient in binocular rivalry.

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What is salient in binocular rivalry

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  1. What is salient in binocular rivalry Fumihiko Taya* and Ken Mogi**, *Department of Physiology1, Osaka University Medical School **Sony Computer Science Laboratory

  2. Abstract • We studied what stimulus features count as salient in binocular rivalry. • We found that motion is very salient and is a determining factor in the ocular dominance pattern in binocular rivalry. • We arrive at a model of binocular rivalry involving three layers.

  3. Neural correlates with the ocular dominance pattern in binocular rivalry • Logothetis et al., 1989 • Leopold et al., 1996 • Kovacs et al., 1996 • Sheinberg et al., 1997 • Tononi et al., 1997 • Fries et al., 1997 • Lumer et al., 1998

  4. Studies on binocular rivalry • Studies on binocular rivalry has been conducted in an “all-or-none” paradigm, neglecting the spatial heterogeneity of the dominance pattern. • Here, we investigate the spatio-temporal structure of ocular dominance pattern in binocular rivalry.

  5. Method(1/2) Left eye Right eye Indicator Fixation point Phase difference Visual awareness

  6. Methods (2/2) • Stimulus we used were: • Circles moving at a speed of 2.2 degrees/s • Stationary circles • We presented rivalrous images to each eyes (visual angle 11 degrees) with Crystal Eyes (StereoGraphics Corporation, Washington D.C., US). • Monitor: FlexScan E67T (Eizo) at 150 frames/s.

  7. Visual awareness in binocular rivalry • Both of the moving circles were always present in visual awareness • Down to 0.3 degrees per second • Up to 20 degrees per second • Sometimes one or both of the stationary circles disappeared from visual awareness

  8. Change of visual awareness:moving circles Time

  9. Change of visual awareness:stationary circles

  10. Average number of circles seen in the moving and stationary conditions

  11. Quantitative Analysis • Subjects were requested to report the perceived color at the position of an indicator which flashed in several position on the screen.

  12. Results: 180 degrees

  13. Results: 72 degrees

  14. Results: 0 degrees

  15. Results: left eye

  16. Results: right eye

  17. Summary of results • The spatio-temporal dominance pattern was strongly influenced by the presence of moving circles. • The visual system behaves as dynamical adaptive system to represent the salient features at any given psychological moment.

  18. Method Left eye Right eye Indicator Fixation point Visual awareness

  19. Results: the effective range of moving circles

  20. Results • The effective range of moving circle was about 2.2 degrees, namely the effect of salient features remained for about 1 second. • The salient feature only had effect on the subsequent visual awareness. • The prediction had no effect on determining the ocular dominance pattern.

  21. Change of visual awareness:Interactive operation Time

  22. Result: move circles voluntarily

  23. Attention Salient features Visual qualia Three phenomenological layers Visual Awareness

  24. Conclusion

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