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Related Experiment Video

Updated: Jul 5, 2026

Assessment of Static Graviceptive Perception in the Roll-Plane using the Subjective Visual Vertical Paradigm

Assessment of Static Graviceptive Perception in the Roll-Plane using the Subjective Visual Vertical Paradigm

Published on: April 28, 2020

Dynamic effects on the subjective visual vertical after roll rotation.

Erika N Lorincz¹, Bernhard J M Hess

¹Department of Neurology, University Hospital Zurich, Zurich, Switzerland.

Journal of Neurophysiology

|May 24, 2008

Summary

Human subjects

Area of Science:

Neuroscience
Vestibular System

Background:

The vestibular system, comprising semicircular canals and otoliths, is crucial for spatial orientation.
Understanding the interaction between these components is key to explaining perceptual biases.

Purpose of the Study:

To investigate the interplay between semicircular canal and otolith signals in subjective visual vertical (SVV) perception.
To determine how different rotational motion profiles (constant velocity vs. constant acceleration) affect SVV estimation.

Main Methods:

Subjects underwent roll tilt in darkness using constant velocity (+/-60 degrees/s) or constant acceleration (+/-30 degrees/s2) paradigms.
The subjective visual vertical was assessed by participant's setting of a luminous line after rotation cessation.
Rotations involved stopping at various tilt angles between -90 and +90 degrees.

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Last Updated: Jul 5, 2026

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Using Eye-tracking to Assess the Relative Importance of Visual and Vestibular Input to Subcortical Motion Processing in the Roll Plane

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Main Results:

A transient bias in SVV estimation was observed, particularly after constant velocity rotations.
This bias was dependent on both rotation and tilt direction following constant velocity.
The bias was significantly reduced or abolished after constant acceleration rotations.

Conclusions:

Gravitational jerk signals from otolith-semicircular canal interactions, or phasic otolith signals, likely cause the transient SVV bias.
The motion profile significantly influences the manifestation and magnitude of this perceptual bias.