Experiment I showed that hearing subjects outperformed deaf subjects on a lipreading task, possibly because they could supplement lip-read stimuli with stored auditory information. Experiment II demonstrated that sighted subjects did not use stored visual information to supplement auditory input, for they performed no differently from congenitally…

To investigate the problem of speechreading failure, a battery of tests was administered to 60 deaf children, half of them poor learners and half good. Results indicated that those who developed speechreading did so at an early age and could deal with words, phrases, and sentences spoken at any rate whereas poor learners comprehended only words…