Evaluation of Visual Parameters by Visual Evoked Potentials Captured by EEG

Université Catholique de Louvain

Status: Enrolling

Conditions: Visual Neurosciences

Treatments: Other: 68-electrode electroencephalography with steady state visual evoked potentials

Study type: Observational

Funder types: Other

Identifiers

NCT05675852

2017%244

Details and patient eligibility

About

This project will be based on an approach that has already proven itself in the field of the development of low-level visual functions such as visual acuity, vernier acuity and contrast sensitivity (Norcia & Tyler, 1985): scanning visual evoked potentials" (sVEP), a special case of steady-state visual evoked potentials (SSVEP). While SSVEPs consist of presenting a visual stimulus periodically, sVEPs are SSVEPs where the value of a parameter (e.g. the contrast of the stimulus) varies. This variation ("scanning") makes it possible to determine the threshold value where an electroencephalographic (EEG) response is perceived, and thus to evaluate visual parameters such as visual acuity, vernier acuity and contrast sensitivity. In this study we therefore record the amplitude of the EEG electrical signal during the presentation of low-level stimuli such as spatial frequency gratings or increasing or decreasing contrast.

Enrollment: 100 estimated patients

Sex: All

Ages: 1 to 75 years old

Volunteers: Accepts Healthy Volunteers

Inclusion criteria

• Absence of ocular pathologies except for refractive errors
• Absence of neurologic conditions

Exclusion criteria

• Participants using neurologic or psychiatric drugs
• Scalp pathology

Trial design

100 participants in 1 patient group

Healthy participants

Description:

Healthy participants aged from 1 to 75 years old. All experiments conducted in this study will make use of the electroencephalogram (EEG) recording technique. Healthy participants cannot participate if they suffer from dermatosis on the scalp. There is no other contraindication to the practice of an EEG, which simply consists of recording the electrical activity of the brain on a trace, after application of a conductive gel on the scalp where sensors connected to a recording device are placed. We will collect the cerebral electrical response by the technique of steady state visual evoked potentials (SSVEP) which consists of presenting a visual stimulus periodically to interpret the EEG signal according to those variations.

Treatment:

Other: 68-electrode electroencephalography with steady state visual evoked potentials