Visuo-Vestibular Adaptation in Virtual Reality

NCT06213792 | Completed

• 1 other identifier: 69HCL23_1326
• Study Type: observational
• Target: 18
• Locations: 1 country
• Sites: 1

Brief Summary

The vestibulo-ocular reflex (VOR) stabilizes the gaze during rapid head movements by inducing an eye rotation of equivalent amplitude but in the opposite direction to the head rotation. Normally, the ratio of eye rotation amplitude to head rotation, or VOR gain, is 1. Under some conditions such as growth or the use of corrective glasses, this gain is adapted to the new visuo-vestibular conditions. This well-known sensorimotor adaptation phenomenon can be achieved through the experimental creation of a conflict between vestibular and visual information. Incremental velocity error (IVE) allows for a rapid adaption of the VOR at high speed by synchronously projecting a laser target that moves to create a progressively increasing visuo-vestibular conflict. However, this method does not correspond to the ecological conditions of VOR use, as the training is conducted in darkness and the visuo-vestibular conflict does not involve the entire visual scene. Recreating this type of adaptation in a virtual reality environment could allow for adaptation with a visual stimulus involving the entire visual scene, thus more closely resembling the physiological conditions of VOR use. We hypothesize that a visual simulation of the entire scene would be more effective than an isolated target in VOR adaptation during high velocity head rotation.

Conditions

Healthy Person

Keywords

Vestibulo-Ocular Reflex; Adaptation; Head Impulse Test; Virtual Reality

Outcome Measures

Primary Outcomes (1)

• VOR gain

  VOR gain corresponds to the amplitude of the eye rotation devided by the amplitude of the head rotation for a given head impulse.

  7 days

Interventions

Adaptation of the VOR OTHER

Subjects will undergo adaptation of their VOR in virtual reality in two different conditions. The side on which the adaptation will take place and the type of condition with which the patients will start will be randomized. Subject will undergo passive rapid head movements done by an experienced examinator whilst fixing a target in front of them. The movement of the target relative to the movement of the head will increase every 90 seconds by 10% until the movement of the visual scene is twice that of the head movement. In one condition the visual scene will be only a target in a grey void. In the other condition the visual scene will be more complex and represent a target in the room in which the subject is seated. Subjects will undergo both conditions at least 7 days apart.

Eligibility Criteria

• Age: 18 Years - 60 Years
• Sex: all
• Age Groups: Adult (18-64)
• Sampling Method: Non-Probability Sample

Study Population

healthy subjects

You may qualify if:

• Age from 18 to 60
• Understanding of the experimental instructions
• Informed Consent

You may not qualify if:

• Underlying ENT or neurological disorders
• Corrected Visual Acuity lower than 5/10
• Other conditions leading to oscillopsia or ataxia
• Oculomotor palsy, ocular instability in primary position
• Treatment that may affect ocular motility (psychotropes)
• Cervical rachis pathology with instability
• Cochlear Implants
• Non-stabilized medical disease
• Subject suffering from debilitating motion sickness or Virtual Reality sickness
• Pregnant women
• Patients under tutelage
• Patient without social security

Sponsors & Collaborators

• Hospices Civils de Lyon: lead

Study Sites (1)

Hôpital Neurologique

Bron, 69677, France

Location

Study Design

• Study Type: observational
• Observational Model: COHORT
• Time Perspective: PROSPECTIVE
• Sponsor Type: OTHER
• Responsible Party: SPONSOR

Study Record Dates

• First Submitted: January 10, 2024
• First Posted: January 19, 2024
• Study Start: April 4, 2024
• Primary Completion: May 2, 2024
• Study Completion: May 2, 2024
• Last Updated: May 16, 2024

Record last verified: 2024-04

Data Sharing

• IPD Sharing: Will not share

Locations

FR (1)