Aggressive and psychopathic traits are linked to the acquisition of stable but imprecise hostile expectations.

In men, effects of learning parameters on aggressiveness failed to reach significance (all p > 0.101) but were medium in size ( | Bs | =[0.370, 0.515]), whereas associations between these same parameters and trait psychopathy were substantially lower ( | Bs | = [0.003, 0.424]).

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