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BISTABILITY & HYSTERESIS IN SUBJECTIVE VERTICAL Bram Bielen Natuurwetenschappen Ministage (40 dagen)

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Presentation on theme: "BISTABILITY & HYSTERESIS IN SUBJECTIVE VERTICAL Bram Bielen Natuurwetenschappen Ministage (40 dagen)"— Presentation transcript:

1 BISTABILITY & HYSTERESIS IN SUBJECTIVE VERTICAL Bram Bielen Natuurwetenschappen Ministage (40 dagen)

2 Subjective Visual Vertical (SVV) What is up?

3 Systematic error in visual vertical classic 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) CWCCW (ρ) Rear View

8 Task Adjustment, what is vertical?

9 Static experiments

10 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 Subject is rotated for two full cycles 720 o 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

17 Bistability illustrated o A-cluster Δ E-cluster

18 Hysteresis

19 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 ContinuousLimited

26 Static results ContinuousLimited

27 Static results ContinuousLimited

28 Dynamic results + CCW o CW

29 Dynamic results + CCW o CW

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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