I read this question Are there benefits to learning to write with your non-dominant hand?. It got me thinking.
This is not a self help question I am using myself to illustrate the condition.
As a child I began life as a left hander. I did everything with my left hand, including playing the guitar, writing, drawing, card playing (I was not betting on these card games).
Early on , around 5-6 I changed handedness. I became right handed, or partially ambidextrous. I now play guitar, write and draw with my right hand. I still play cards (not for money) with my left hand. I can attend to my matters of hygiene equally well with either hand. I make reference to this, as it is surprising to find how difficult it is for people to clean themselves with their non-dominant hand. My left handed writing is inferior to my right hand. I am not truly ambidextrous.
No one coerced or encouraged me (although I did attend a catholic school with nuns) to write with my right hand.
What is the phenomena of spontaneous change of handedness?
Are there studies showing any correlations with the brain and such phenomena?
How is someone like this defined; ie right handed, left handed, ambidextrous?