Fig. 1.

Real Animal Size Test and fNIRS probe. (A) After the fixation cross and auditory task cue, children had to press on the side of the animal that was either bigger on the screen (Picture Game) or in real life (Animal Game). (B) After each trial run, participants were shown either just their own score beside their first name (Neutral condition) or their own score, and that of the other ‘player’ beside the other player’s picture (Cooperative and Competitive conditions). (C) Projection of the probe onto a standard brain atlas with 10–20 system landmarks. (D) Probe layout. Sources are indicated in red and detectors in blue. Digits in color indicate the channel number within each region. Brain regions are shown in orange, purple, and green. Channels marked with dotted lines showed no difference between HbO and HbR (see Table 1) and were not included in statistical analyses. (E) Example of a participant wearing the fNIRS probe (For interpretation of the references to colour in this figure legend, the reader is referred to the web version of this article).