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Mean ±SE frequency of trial outcomes (reward, R; temptation/sucker, T/S; punishment, P) in 25 daily trials for pairs of rats tested in a model of iterated Prisoner’s Dilemma. Behaviour of (a, d) RM− males, (b, e) RM+ males and (c, f) RF−females was tested during ad libitum feeding (a–c) and under food restriction (d–f). Within each graph, bars with a common letter were not significantly different.
