That's a tall order, Greatshield17 /rolling up my sleeves
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It is very difficult to talk about things that were not yet defined, labeled, and agreed upon although biographies can be rich sources once you know which bios to read. So one does end up with a lot of
The best treatment of this that I have read is "
Not Even Wrong". The author (a writer specializing in history, memoir, and unusual antiquarian literature) wrote it in response to his two-year-old's diagnosis. He asked the same question you do, and the book has the answers he uncovered. Might be a good starting point.
Another excellent piece is
Autism's First Child (full document). It describes the first child that Kanner diagnosed with autism and gives some context to how he lived. The whole village showed up for him
I know in my personal history is genetic and not anything with vacines or toxins. Both of my parents, all three sibs, and paternal aunt and her youngest are all aspie. My five children range from mild to moderate aspie. Oddly, I have never found evidence of kanner's style in the family history. In the three generations with whom I am personally familiar, the XYs are all engineers and the XXs empaths (embarrassing, yet true).
My mom was totally into healthfood (in the 50s). We had to send away to Bulgaria for yogurt starter and we made all of our bread. The Wonder bread was delivered to the house in those days, but it was banned for us. We grew most of our veggies. I was obviously autistic before I ever got my first vaccine in the 50s (polio on a sugar cube - we did not have sugar in our house and that was a treat!).
The entire autism genetics field has been messed up by choosing to study autism through syndromes (trisomy 21, fragile x) and ignoring aspie-rich families.
I hope you keep us all in the loop with this project @Greatshield17!!