Evaluation of Visual Parameters by Visual Evoked Potentials Captured by EEG

Evaluation of Visual Parameters in Healthy and Visually Impaired Adults Using the Sweep and Oddball Technique Associated With Visual Evoked Potentials Captured by EEG

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.

Inclusion Criteria:

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

Exclusion Criteria:

• Participants using neurologic or psychiatric drugs
• Scalp pathology