converting brain waves into sound & vice-versa

Hey,

 

Can this be done?

Is it possible to record the electrical brain pattern of a human in different states (walking, running, angry..etc..) and tranform these into sounds?

 

What would be the effects of playing this back to the subject?

 

I am considering this as my dissertation topic for my MSc, any ideas/ knowledge  in this field are highly welcome! 

 

Gal.m

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