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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.

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.

The question:

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?

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