Participants
Twenty healthy participants (13 females, one left-handed, mean age 20.5 years, range: 18 years to 27 years) volunteered in the study. The sample size was determined based on a previous EEG study of ours (Gundlach et al. 2020) as we used an almost identical paradigm. All participants had normal or corrected to normal vision and no history of photic epilepsy. The study had full ethical approval from the local ethics committee according to the Declaration of Helsinki and all participants gave written informed consent. We confirm that all methods were performed in accordance with the relevant guidelines and regulations following the Spanish and European law (Ley Orgánica 15/ 1999 de Protección de datos de Carácter Personal LOPD y Real Decreto 994/ 1999).