Actually it may have something to do with biological differences in social stress response on top of conditioning. I personally find this fascinating--a biolog

Actually it may have something to do with biological differences in social stress response on top of conditioning. I personally find this fascinating--a biological basis carries with it a possibility of pharmacological treatment for those wanting it, and perhaps the design and validation of nonpharmacological approaches for those who don't or third parties seeking to reduce bias. IIRC, there are a couple experiments in rat models along the lines of: put a male or a female rat in the same cage as an aggressive, territorial rat. The male rats are back to normal within hours-days. The female rats take days-weeks. IIRC some sort of neuronal transcription factor or something is thought involved. Can track down a review if anyone's interested.