Regarding neurology, here’s a fragment of a lecture where the speaker discusses those studies: https://www.youtube.com/watch?v=8QScpDGqwsQ It should give you a basis to find the studies, of which you’ll probably find a few more recent ones.

Regarding the latter, take a look at this post: https://old.reddit.com/r/musicotic/comments/8ttud4/a_comprehensive_defense_of_trans_people/ I recommend checking the links and references one by one. Some link to journalistic articles or educative material, some are broken links, and some others are actually scientific articles.