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There also has been some amazing work in C. elegans where the researchers can change the sex of the nervous system and also change their behaviour. Again this is excellent evidence that the genetic "sex" of the brain determines behaviour. For sure it will be more complicated than this and for sure there is an epigenetic component but model organisms like C. elegans will certainly help us understand complex human behaviours. Its worms but the evolutionary conservation of molecular signaling pathways between worms and humans are very similar if not identical. Cheers!
ian

Valuable comment again, thanks)