EEG recordings in response to periodic and dithered photic stimulation (light flicker) in healthy participants

EEG recordings of n = 16 healthy participants at rest with eyes open receiving photic stimulation (light flicker) with various frequencies, inter-pulse interval variabilites (dithering level), and modulation depths. The experimental paradigm comprise two parts: 1) a frequency sweep with periodic stimulation only, and 2) comparison between periodic and dithered stimulation at various frequencies, including the individual frequency of maximum half-harmonic power response identified in the first step. For more details, please see  https://doi.org/10.1016/j.brs.2026.103111For each participant, the data corresponding to part 1 are in “PID_XX_calib.smr” (or “PID_XX_calib.mat”), and the data corresponding to part 2 are in “PID_XX_main.smr” (or “PID_XX_main.mat”). Recordings include 15 EEG channels and the synchronised photodiode signal capturing stimulation pulses. In the .mat files, these 16 signals are in the variable “SmrData.WvData”, and the corresponding channel names in “SmrData.WvTits”.The matlab scripts “all_participants_calib.m” and “all_participants_main.m” (and associated functions) demonstrates how to load the EEG data (and synchronised photodiode output) in the .mat format, and segment trials corresponding to parts 1 and 2 of the experiment, respectively. These scripts also describe how to obtain the stimulation conditions corresponding to each trial, and can plot the photodiode signal and associated statistics for each trial. The correspondence between stimulation condition and randomised trial number is given in the text files “PID_XX_calib.txt” and “PID_XX_main.txt”, but also directly included in the scripts “all_participants_calib.m” and “all_participants_main.m” for convenience (see variable “condOrder”).