Participants

Thirteen paid participants (six male) aged 18–34 years (mean 24 years) took part in the experiment after giving written informed consent. Data from one (female) participant were excluded due to excessive sleepiness, motion artifacts, and very low behavioral performance. All participants had normal or corrected-to-normal vision with an acuity of ≥1 in at least one eye as assessed with the Freiburg visual acuity test (Bach, 1996), and all reported being right-handed. All procedures were in accordance with the Declaration of Helsinki and approved by the local ethics committee.