Testosterone administration decreases generosity in the ultimatum game.

For generosity we found highly significant correlations with total T (r = −0.25, two-tailed t test, N = 200 for this and subsequent tests, p = 0.0004), free T (r = −0.1908, p = 0.0068), and DHT (r = −0.3063, p = 0.0001); see Fig. 4A .

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