Testostrone has the net effect of making effort feel good, or at least increasing the threshold at which effort feels bad or unsustainable. It does that by way of changing the activity, or the threshold for activation, of brain structures like the amidula and other brain structures associated with anxiety. And if people who or mice who have the aromatis engyme have that enzyme block, well then it doesn't matter how much you increase testostrone or any of its other derivatives, you do not observe this aggression. So we've established that it's not testasteron, but testasron converted into estrogen, that activates circuits for aggression.

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