Fig. 1.

Trial sequence and timing of the Advisor-Advisee Game. The subject (Advisor A), but not the Advisee or Advisor B (both confederates), was initially presented with two boxes on the screen. Each box showed the probability of that box winning if it was later selected. The subject was told that when these probability percentages were replaced with question marks, both the Advisee and Advisor B could now also see the boxes. The subject then gave advice by pressing a left or right button to signal to the Advisee which box was the most likely one to win. Following this, the subject was told that the Advisee could either accept their advice, reject their advice or accept both the subject’s and Advisor B’s advice. After a jittered ITI, the outcome of whether the Advisee won or lost was revealed to the subject. Finally, to ensure the subject was paying attention, she/he had to indicate the win or lose outcome of the Advisee.