Experimental setup used in experiments 1 and 2.

<p>In both experiment, subjects (S) were placed in a cage where they could interact with an individual (I) in front of another cage where an audience (A) was present or not. In experiment 1 subjects could interact with a receptive female while in experiment 2, subjects were in a competition for food with another male. In both experiment, there were three conditions: a ‘no audience’ condition, b ‘familiar audience’ condition and c ‘mate audience’ condition. The order of conditions was balanced.