Comparing Vestibular Responses to Linear and Angular Whole-Body Accelerations in Real and Immersive Environments.

Area of Science:

• Neuroscience
• Vestibular System Research
• Human Physiology

Background:

• Vestibular end organs possess unique anatomical and physiological traits.
• Sensory inputs like visual stimuli and vestibular sensation differentially affect these organs.
• Understanding variations in vestibular response to physical versus virtual stimuli is crucial.

Purpose of the Study:

• To investigate and compare vestibular responses to axial tilts in physical and virtual environments.
• To analyze differences in afferent activity induced by physical versus visually-driven vestibular stimuli.
• To determine if visual stimuli can evoke distinct vestibular responses across different axial tilt types.

Main Methods:

• Twenty-seven healthy participants underwent four passive whole-body movements (linear: up-down; angular: yaw, pitch, roll).
• Stimuli were delivered via a hydraulic chair (physical) and a head-mounted display (virtual).
• Electrovestibulography (EVestG) measured vestibular response magnitude using action potential area, amplitude, and firing rate change.

Main Results:

• Pitch and roll tilts generally produced the largest EVestG changes for both physical and virtual stimuli.
• No significant difference was found between roll and pitch tilt responses.
• Responses to right-side and left-side roll tilts were also not significantly different.

Conclusions:

• Visually- and physically-induced vestibular responses exhibit differences in afferent activity.
• Despite these differences, visual stimuli can elicit distinct vestibular responses to various axial tilts.
• This highlights the potential of virtual environments in studying vestibular system function.