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I used to date a girl who was born deaf. They don't know sound but they can mimic sound by feeling the throat of another when they speak, they try to match the vibrations and mouth movements.
She told me (signed) she had a dream that I was cheating on her but I never asked if she had sound in her dream.
I would assume the dream would be silent with imagery that they understand. Like she said I was walking away holding another girls hand.
Naturally our brains use pictures. I think it's possible to form complex thought using imagery.
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