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Assessment of Static Graviceptive Perception in the Roll-Plane using the Subjective Visual Vertical Paradigm
Published on: April 28, 2020
Verticality perception during off-vertical axis rotation.
R A A Vingerhoets1, J A M Van Gisbergen, W P Medendorp
1Department of Biophysics, Radboud University Nijmegen, PO Box 9101, 6500 HB Nijmegen, The Netherlands. r.vingerhoets@science.ru.nl
Journal of Neurophysiology
|March 3, 2007
Summary
Off-vertical axis rotation (OVAR) causes illusory translation perception due to canal-otolith interaction. This study confirms OVAR leads to worsening tilt underestimation, supporting the canal-otolith interaction model.
Area of Science:
- Vestibular system neuroscience
- Human sensory perception
- Otolith-canal interaction dynamics
Background:
- Off-vertical axis rotation (OVAR) induces a sense of translation as perceived rotation diminishes.
- A canal-otolith interaction model explains this illusory translation by otolith signal misinterpretation.
- The model predicts concurrent underestimation of tilt during OVAR.
Purpose of the Study:
- To experimentally test the prediction of worsening tilt underestimation during OVAR.
- To quantify the time course and influencing factors of subjective visual vertical (SVV) errors during OVAR.
- To validate the canal-otolith interaction model's predictions.
Main Methods:
- Six subjects underwent OVAR stimulation in darkness at varying tilt-rotation parameters.
- Subjective visual vertical (SVV) was measured using an adaptive staircase procedure.
- Participants indicated perceived line orientation relative to vertical during brief flashes.
Main Results:
- SVV errors, indicating tilt underestimation, were present from rotation onset and increased exponentially.
- Errors reached an asymptote around 60 seconds, influenced by rotation speed and OVAR tilt angle.
- Initial SVV errors correlated with static tilt response errors.
Conclusions:
- Verticality misjudgments in OVAR have a dynamic component driven by canal-otolith interaction.
- This dynamic component is superimposed on a static tilt-related error.
- Findings support the canal-otolith interaction model for OVAR-induced perceptual phenomena.
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