Atleast until 1960s left handers were forced to learn to write with their right hand. I think a lot of older true left handers are being counted as right handed, hince their decreased representation in the older population. I am left handed and remember as a child my grandmother arguing with my mother not to “let me” keep using my left hand.
Excellent theory - I have a (much, much) older brother in his 40s that I've heard may have been forcibly converted in school. Also has a bad stutter.
You said — “Atleast until 1960s left handers were forced to learn to write with their right hand.”
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Well, it didn’t work with me. They never could get me to do that... :-)
They tried to do that to me at school and my mom told them to leave me alone.