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Evaluation of Visual Parameters by Visual Evoked Potentials Captured by EEG

NCT05675852 · Status: UNKNOWN · Type: OBSERVATIONAL · Enrollment: 100

Last updated 2023-01-09

No results posted yet for this study

Summary

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.

Conditions

  • Visual Neurosciences

Interventions

OTHER

68-electrode electroencephalography with steady state visual evoked potentials

Electroencephalography is registered through a 68-electrode electroencephalography while stimuli will be presented at the centre of the screen at a distance of 150cm. The pattern of visual stimulation is based on the technique of steady state visual evoked potentials. These potentials consist of the presentation of a visual stimulus at a (relatively fast) periodic rate to produce an EEG signal over the occipital cortex exactly at the frequency of stimulation. By varying the value of a parameter of the stimulation (e.g. the contrast of the stimulus) varies. This variation makes it possible to determine the threshold value where an EEG response is perceived, and thus to evaluate visual parameters such as visual acuity, contrast sensitivity or recognition of more complex shapes.

Sponsors & Collaborators

  • Université Catholique de Louvain

    lead OTHER

Eligibility

Min Age
1 Year
Max Age
75 Years
Sex
ALL
Healthy Volunteers
Yes

Timeline & Regulatory

Start
2022-12-01
Primary Completion
2023-01-31
Completion
2023-04-30

Countries

  • Belgium

Study Locations

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Read the full study record

This page highlights key information. For complete eligibility criteria, study locations, investigator contacts, and the full protocol, visit the original record on ClinicalTrials.gov.

View NCT05675852 on ClinicalTrials.gov