I know this condition very well as my sister-in law has it. It's called Tourette Syndrome. It is not only involuntary vocalizations but also ticks and rapid movements that occur repeatedly. It's a neurological disorder
My sister-in law's hands constantly move, like she is playing the piano, and she talks very fast. She wasn't diagnosed until she was an adult.
When she was young she went to Catholic school(back them her head would shake constantly) everyone thought she was just nervous and neurotic. The Nun's would hold her head and yell at her to stop shaking. Needless to say she had a very tramatic childhood,
Tourette Syndrome is treated with a variety of antidepressants. It's sort of a trial and error basis. There is no real cure. My sister-in-law has tried many combinations of drugs without much success.
The hardest part is that she gets very little sleep because it is a 24/7 condtiion.
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