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).