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. 2022 Jun 8;289(1976):20220453. doi: 10.1098/rspb.2022.0453

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Published by the Royal Society. All rights reserved.

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Figure 3. — Resident-intruder test. (a) Males in the saline group show no difference in prosocial behaviour from test 1 to test 2. (b) Males in the testosterone (T) group show a decrease in prosocial behaviour from test 1 to test 2 after receiving a T injection. (c) For test 1, males in the T group were significantly more prosocial than males in the saline group. (d) For test 2, prosocial behaviour did not differ between the saline and T groups. (e) The magnitude of the decrease in prosocial behaviour within a resident-intruder test does not significantly differ between tests 1 and 2 in saline males. (f) The magnitude of the decrease in prosocial behaviour within a test is significantly greater in test 2 (post T-injection) in T group males. An asterisk indicates statistical significance (p < 0.05). (Online version in colour.)