(A) Study 2: Mean latency as a function of trials with the generous and the selfish experimenters.

<p>The dashed line represents the latency to approach the selfish (S) experimenter, whereas the full line represents the latency to approach the generous (G) experimenter. ISI: inter-session interval. Error bars denote ±1 sem. (B) Study 2: Proportion of choices for the generous (G) over the selfish (S) experimenter. The horizontal dashed line indicates the 0.50 chance level. *: p < 0.05