Figure 4.

(a) Absolute number of trials in experiment 3 in which subjects in the communicator's role signalled one of the boxes (empty or with tools). On the X-axis are the subjects in the communicator's role with their recipient partners in parenthesis (in the order in which they participated in the communicator's role). (b) Absolute number of trials in experiment 3 in which recipients followed versus did not follow, the communicators' signals. On the X-axis are the subjects in the recipient's role with their communicator partners in parenthesis (in the order in which they participated in the recipient's role).