Randomized trial · 2009

Testosterone administration decreases generosity in the ultimatum game

P. J. Zak, R. Kurzban, S. Ahmadi. PLoS ONE · N=25.

Androgel in men reduced generosity in the ultimatum game. Small crossover sample. Later labs did not treat this as settled; several failed to move rejection rates.

Open source doi:10.1371/journal.pone.0008330 PMID 20016825

Edges that cite this paper

Exogenous T changes bargaining — but not in the folk direction, and not in every lab.

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What Causes What. “Testosterone administration decreases generosity in the ultimatum game.” https://whatcauseswhat.org/papers/p-zak-2009 (atlas updated 2026-08-31).

https://whatcauseswhat.org/papers/p-zak-2009