Figure 1 : Participant arrangement and cooperation task structure.

From: Sex differences in neural and behavioral signatures of cooperation revealed by fNIRS hyperscanning

Figure 1

(A) Participants were sat on opposite sides of a square table, in front of individual monitors and keyboards. (B) Trial stimulus sequence. Both participants were seated in front of their own computer screen and keyboard. Each trial began with a hollow gray circle appearing in the center of the screen for an unpredictable duration between 0.6 and 1.5 seconds. An abrupt change in the color of the circle from black to green initiated the participant’s response. Following both responses, a “win” or “lose” message was presented, depending on whether the inter-response latency of both participants was less than , where R1 and R2 are the response times for both participants respectively. A ‘+’ and ‘−’ sign was also presented, which indicated the faster/slower responder for each trial. The symbol on both participants’ left hand side of the screen corresponded to their response speed relative the their partner. Two 40 trial cooperation task blocks were separated by a 30 second rest period. Task-related inter-brain coherence was calculated as the average coherence during both task blocks minus coherence during rest .