Deaf hearing
When patients are completely deaf in both ears they begin to rely more strongly on their other senses. Because hearing relies on external sound waves, a deaf patient will feel the vibrations, rather than relying on what would normally be perceived as sound. As a patient relies on "feeling" sounds rather than hearing them, they subconsciously hear with their sense of touch, therefore reacting to auditory stimuli without actually hearing sound.
Deaf hearing-2