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Related Experiment Video

Updated: Mar 28, 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

The Subjective Visual Vertical and the Subjective Haptic Vertical Access Different Gravity Estimates.

Lindsey E Fraser¹, Bobbak Makooie¹, Laurence R Harris¹

¹Center for Vision Research, York University, Toronto, Ontario, Canada.

|December 31, 2015

Summary

Subjective visual vertical (SVV) and subjective haptic vertical (SHV) measure gravity perception differently. SVV relies on head position, while SHV uses body position, revealing distinct gravity estimates.

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Area of Science:

Neuroscience
Human Perception
Vestibular System

Background:

Subjective visual vertical (SVV) and subjective haptic vertical (SHV) are used to study gravity perception.
SVV and SHV exhibit different error patterns (A-effect vs. E-effect) during body tilt.

Purpose of the Study:

To compare SVV and SHV to understand their distinct contributions to gravity perception.
To investigate how head and body orientation influence SVV and SHV.

Main Methods:

Five experiments comparing SVV and SHV across various body and head tilt conditions.
Inclusion of disruptive galvanic vestibular stimulation (dGVS) and neck muscle vibration.

Main Results:

SVV showed an A-effect (bias towards body) with larger tilts, while SHV remained accurate or showed an E-effect (bias away from body).
Head tilt primarily affected SVV, while body tilt influenced SHV.
Vestibular noise (dGVS) abolished A-effects and induced E-effects in SHV.
Neck vibration optimized the integration of SVV and SHV signals.

Conclusions:

SVV and SHV access distinct gravity percepts, relying on head and body position information, respectively.
Findings support a model where head and body provide separate inputs for gravity estimation.