5-Class Burst C-VEP with Dry EEG

Participants

The experiment was conducted with twenty four healthy volunteers (4 women, mean age = 29.3 years, SD = 7.5), all students and staff at ISAE-SUPAERO. None of the participants reported any of the exclusion criteria (neurological antecedents, being under psychoactive medication at the time of the study) and had normal or corrected-to-normal vision. The study was approved by the ethics committee of the University of Toulouse (CER approval number 2023-749) and was carried in accordance with the declaration of Helsinki. Participants gave informed written consent prior to the experiment

Experimental Protocol

Participants were comfortably seated and instructed to read and sign the informed consent. EEG data were recorded using the dry 8-electrodes Enobio system at a sample rate of 500Hz to record the surface brain activity. The 8 electrodes were positioned over the occipital and parieto-occipital sites: PO7, O1, O2, O3, PO8, PO3, POz, PO4. EEG data and markers were synchronized during recording using Lab Streaming Layer. Once equipped with the dry 8-electrode EEG system, volunteers were asked to focus on five targets that were cued sequentially in a random order for 0.5s, followed by a 2.2s stimulation phase, before a 0.7s inter-trial period. The cue sequence for each trial was pseudo-random and different for each block. After each block, a pause was observed and subjects had to press the space bar to continue. The participants were presented with fifteen blocks of five trials for each of the three conditions (Gabor-based textures, Ricker-based textures or Plain stimuli). The stimuli were presented on the following LCD 24.5'' monitor: Iiyama Gold Phoenix G-Master GB2590HSU-B1, 1920x1080 pixels, 400 cd/m², and the refresh rate has been set to 60Hz.

Preprocessing

No pre-processing was applied on these data, and they have been neither sliced or epoched, although it remains possible to do so with the help of the markers.