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Bistability and Hysteresis in Subjective Vertical Perception Study

This study by Bram Bielen explores the effects of head and feet tilt on Subjective Visual Vertical (SVV). Discover the Aubert and Müller effects and how SVV deviates with head and feet tilt direction. Dynamic and static experiments, hysteresis illustrated, and recommendations for future research included.

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Bistability and Hysteresis in Subjective Vertical Perception Study

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  1. BISTABILITY & HYSTERESISIN SUBJECTIVE VERTICAL Bram Bielen Natuurwetenschappen Ministage (40 dagen)

  2. Subjective Visual Vertical (SVV) What is up?

  3. Systematic error in visual verticalclassic interpretation

  4. Aubert effect (A-effect) SVV deviates in the direction of head tilt. (Underestimation of body tilt).

  5. Müller effect (E-effect) SVV deviates in the direction of feet tilt. (Overestimation of body tilt).

  6. Effects illustrated

  7. ClockWise (CW) & CounterClockWise (CCW) CCW CW (ρ) Rear View

  8. Task • Adjustment, what is vertical?

  9. Static experiments

  10. Static experiments • Subjects are rotated to an angle (ρ) between 0 and 360º, CW or CCW. • Testing begins after final tilt angle is reached. • Examples: 30 sec / 60 sec.

  11. Typical static test result * CW O CCW

  12. Dynamic experiments

  13. Dynamic experiments • Subject is rotated for two full cycles 720o CW or CCW. • Testing during rotation. • Stimulus at 3 sec interval

  14. Dynamic test result

  15. Bistability

  16. Two types of response possible At larger tilt angles Bistability

  17. Bistability illustrated o A-cluster Δ E-cluster 0 90 180 270 360

  18. Hysteresis

  19. Hysteresis • Response depends on direction of preceding rotation • LP & SP

  20. Hysteresis illustrated

  21. Research

  22. Why? • Different results dynamic and static experiments

  23. Test Paradigm • Continuous & limited static • dynamic

  24. Task • What is the orientation of a line?

  25. Static results Limited Continuous

  26. Static results Limited Continuous

  27. Static results Limited Continuous

  28. Dynamic results o CW + CCW

  29. Dynamic results o CW + CCW

  30. Conclusions • Verification of bistability and hysteresis • Bistability in dynamic data

  31. What to do? • More subjects • Different angles • Other paradigms • Bayesian model

  32. Any questions?

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