Factgirl's fact of the day:

You know that little voice in your head? Your inner voice? Deaf people have one too.

As deaf people learn to read and write, they pick up phonological representations of the letters and words even without auditory input.  This makes sense because the regions of the brain that are active while they sign are the language areas - not the small motor areas.

Bonus Fact: Deaf schizophrenics have auditory hallucinations, and blind schizophrenics have visual ones.

-its a fact!

source: Deaf World Web