Some of the more recent investigations (Anderson, Stevens, &
Stuckless, 1966; Frisina, 1955; Vernon, 1966; Vernon, 1967a, 1967c,
1967d) suggest that there may be a disproportionately higher
prevalence of low IQs among those in schools for the deaf and hard-
of hearing when compared to expected values for IQ distributions.
Similarly, studies of retarded populations suggest a higher
prevalence of impaired hearing, but not necessarily deafness, than
is found in nonretarded populations (Mathews, 1975, p. 540; Kodman,
Powers, Weller, & Phillip, 1963, p. 465).
The point to be made is that the relationship, if any, between
mental retardation and deafness is not causal but is due to the
common etiology which brought about both the deafness and the
retardation.
The fact that certain of these etiologies and conditions—maternal
rubella, purulent meningitis of early onset, premature birth,
tuberculous meningitis, etc.—are responsible for an increasing
percentage of the deaf school-age population suggests that there may
be proportionately more retardation among deaf children in the
future.
Journal of Deaf Studies and Deaf Education 10:3 Summer 2005
Fifty Years of Research on the Intelligence of Deaf and Hard-of-
Hearing Children: A Review of Literature and Discussion of
Implications
McCay Vernon
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