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Perception of the dynamic visual vertical during sinusoidal linear motion.

A Pomante1, L P J Selen2, W P Medendorp2

  • 1Radboud University, Donders Institute for Brain, Cognition and Behaviour, Nijmegen, The Netherlands a.pomante@donders.ru.nl.

Journal of Neurophysiology
|August 18, 2017
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Summary
This summary is machine-generated.

The brain uses vestibular signals for spatial orientation, but linear acceleration can cause tilt illusions. Our study shows how vestibular noise affects tilt perception during motion, revealing insights into spatial orientation processing.

Keywords:
Bayesian integration modelgravityperceptionsomatogravic illusionsubjective visual vertical

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Area of Science:

  • Neuroscience
  • Vestibular System
  • Spatial Orientation

Background:

  • The vestibular system provides spatial orientation but faces ambiguity, as otoliths cannot differentiate gravity from linear acceleration.
  • Prolonged linear acceleration can lead to the somatogravic effect, where tilt is perceived.
  • Bayesian inference models suggest the brain combines noisy vestibular signals with prior assumptions to resolve this ambiguity.

Purpose of the Study:

  • To investigate how noise in vestibular signals influences the dynamic characteristics of tilt perception during linear whole-body motion.
  • To psychometrically characterize the dynamic visual vertical as a proxy for tilt perception during passive sinusoidal linear motion.

Main Methods:

  • Developed a novel psychometric paradigm to assess the dynamic visual vertical.
  • Subjects (n=10) underwent passive sinusoidal linear motion along the interaural axis.
  • Judged the orientation of a briefly flashed line relative to gravity while fixating on a body-fixed light.

Main Results:

  • Observed a phase-dependent modulation of the dynamic visual vertical, consistent with Bayesian model predictions.
  • Identified subject-specific phase shifts between the perceived tilt and the imposed acceleration signal.
  • The magnitude of modulation was less than predicted, suggesting non-vestibular signal contributions.

Conclusions:

  • Findings suggest a link between vestibular system noise and the characteristics of the dynamic visual vertical.
  • Systematic error patterns in disambiguating linear acceleration and spatial orientation were observed during motion.
  • The study discusses illusory percept dynamics using a Bayesian model incorporating vestibular signal uncertainty and motion priors.