Comment by Maurizio on Why Are Transgender People Immune To Optical Illusions? · 2018-06-02T05:00:54.255Z · LW · GW

It seems to me that the effects you find for the categories you examine are likely not strongly related. In particular, I am utterly unsurprised that Autistic persons showed an effect on the spinning face but not the , given that facial recognition is a critical social skill that Autistic people tend to struggle with:

https://www.ncbi.nlm.nih.gov/pubmed/15215211

It seems more likely that this is the cause of the effect you find than any problems with a single neurotransmitter, which to me sound suspiciously like the old idea that lack of serotonin was the only cause of depression.