Fig. 1.

Experimental design and behavioral results. (A) After a variable ITI, participants were first given the opportunity to observe the confederate player being presented with two abstract fractal stimuli to choose from. After another variable ITI, participants were then presented with the same stimuli, and the trial proceeded in the same manner. When the fixation cross was circled, participants made their choice using the index finger (for left stimulus) and middle finger (for right stimulus) on the response pad. (B) The proportion of correct choices increased with increasing amounts of social information. (C) There was a monotonic increase in the proportion of correct choices as a function of the observability of the other player's behavior and outcomes. Learning from the actions and outcomes of the other player resulted in significantly more correct choices than action only observable and individual learning conditions.