Studies have suggested that some do, some don't. The more deaf you are, the less likely you are to subvocalise. Totally not an expert in this area, but I think

Studies have suggested that some do, some don't. The more deaf you are, the less likely you are to subvocalise. Totally not an expert in this area, but I think everybody associates more than just the sound of the word - movement of lips, memories, and other senses are also involved. Deaf people can obviously acquire those 'subvocalisations' instead. http://books.google.co.uk/books?id=8PhwXf9uj1IC&pg=PA114&lpg=PA114&dq=deaf+subvocalization&source=bl&ots=ZzKLbj_KCD&sig=204yVPfW8uNexHCO2M1-fby5kVk&hl=en&sa=X&ei=fE8rUeGZLsqR4ASE5IGgAw&ved=0CGwQ6AEwCA#v=onepage&q=deaf%20subvocalization&f=false http://books.google.co.uk/books?id=8PhwXf9uj1IC&pg=PA114...