The Definition of Deaf | Thought Repair2014/08/31 These factors had a cascading effect on measures of cognition on the deaf. They reinforce the false intuition that deaf people are inherently disabled and/or disadvantaged. While limitations may exist they are not intrinsic to a brain system without auditory input. Instead, it is increasingly clear that the deaf match the hearing on many central cognitive measures when you remove effects of language bias and cultural deprivation. Unfortunately, these negative factors have a continued influence on the deaf, reinforced by those hearing definitions.