The purpose of this article was to examine the logic and the empirical data supporting the proposition that intelligence tests are not necessary for the definition of a learning disability. Four assumptions of the use of IQ test scores in the definition of learning disabilities were examined. These assumptions were (a) IQ tests measure intelligence; (b) intelligence and achievement are independent, and the presence of a learning disability will not affect IQ scores; (c) IQ scores predict reading, and children with low IQ scores should be poor readers; and (d) reading disabled children with different IQ scores have different cognitive processes and information skills. It was argued that IQ scores measure factual knowledge, expressive language abilities, and short-term memory, among other skills, and that because children with learning disabilities have deficits in these areas, their scores may be spuriously low. It was also shown that some children with low IQ scores can be good readers, indicating that low IQ scores do not necessarily result in poor reading. Empirical evidence was presented that poor readers at a variety of IQ levels show similar reading, spelling, language, and memory deficits. On logical and empirical grounds, IQ test scores are not necessary for the definition of learning disabilities.
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References
1.
Algozzine, B., Ysseldyke, J.E., & Shinn, M.E. (1982). Identifying children with learning disabilities: When is a discrepancy severe?Journal of School Psychology, 20, 299–305.
2.
Arnold, L.E., Barneby, N., McManus, J., Smeltzer, D.J., Conrad, A., Winer, G., & Desgranges, L. (1977). Prevention by specific perceptual remediation for vulnerable first-graders. Archives of General Psychiatry, 34, 1279–1294.
3.
Arnold, L.E., Smeltzer, D.J., & Barneby, N.S. (1981). Specific perceptual remediation: Effects related to sex, IQ, and parents' occupational status; behavioral change pattern by scale factors; and mechanism of benefit hypothesis tested. Psychological Reports, 49, 198
4.
Baron, J. (1979). Orthographic and word-specific mechanisms in children's reading of words. Child Development, 50, 60–72.
5.
Barsky, V.E., & Siegel, L.S. (1987). The speed factor and WISC-R Performance IQ: Effects on subtypes of learning disabled children. Unpublished manuscript.
6.
Biemiller, A. (1977–78). Relationships between oral reading rates for letters, words, and simple text in the development of reading achievement. Reading Research Quarterly, 13, 223–253.
7.
Biemiller, A., & Siegel, L.S. (1988). Developmental changes in relationships between reading comprehension, reading speed, reading accuracy, and working memory. Unpublished manuscript.
8.
Bishop, D.V.M., & Butterworth, G.E. (1980). Verbal-performance discrepancies: Relationship to birth risk and specific reading retardation. Cortex, 16, 375–389.
9.
Forness, S.R., Sinclair, E., & Guthrie, D. (1983). Learning discrepancy formulas: Their use in actual practice. Learning Disability Quarterly, 6, 107–114.
10.
Gates, A.I., & McKillop, A.S. (1962). Gates-McKillop reading diagnostic tests. New York: Teachers College Press.
11.
Gilmore, J. V., & Gilmore, E.C. (1968). Gilmore oral reading test. New York: Harcourt, Brace, Jovanovich.
12.
Goldman, R., Fristoe, M., & Woodcock, R. W. (1974). GFW sound-symbol tests. Circle Pines, MN: American Guidance Service.
13.
Hall, J. W., Wilson, K.P., Humphreys, M.S., Tinzmann, M.B., & Boyer, P.M. (1983). Phonemic similarity effects in good vs. poor readers. Memory and Cognition, 11, 520–527.
14.
Jastak, J.R., & Jastak, S.R. (1978). Wide range achievement test. Wilmington, DE: Jastak Associates.
15.
Kershner, J.R., Cummings, R.L., Clarke, K.A., Hadfield, A.J., & Kershner, B.A. (1987). Developmental study of learning disabled children and follow up of the effects of the Tomatis remedial program. Unpublished manuscript, Ontario Institute for Studies in Education, Toronto, Canada.
16.
Kirk, S.A., McCarthy, J.J., & Kirk, W.D. (1968). Illinois test of psycholinguistc ability. Urbana: University of Illinois Press.
17.
Lezak, M.D. (1988). IQ: R.I.P.Journal of Clinical and Experimental Neuropsychology, 10, 351–361.
18.
Lytton, H. (1967). Follow-up of an experiment in selection for remedial education. British Journal of Educational Psychology, 37, 1–9.
19.
O'Donnell, L.E. (1980). Intra-individual discrepancy in diagnosing specific learning disabilities. Learning Disability Quarterly, 3, 10–18.
20.
Olson, R., Kliegl, R., Davidson, B.J., & Folz, G. (1984). Individual and developmental differences in reading disability. In T.G. Waller (Ed.), Reading research: Advances in theory and practice (Vol. 4, pp. 1–64). New York: Academic Press.
21.
Rodgers, B. (1983). The identification and prevalence of specific reading retardation. British Journal of Educational Psychology, 53, 369–373.
22.
Rourke, B.P., & Finlayson, M.A.J. (1978). Neuro-psychological significance of variations in patterns of academic performance: Verbal and visual-spatial abilities. Journal of Abnormal Child Psychology, 6, 121–133.
23.
Rutter, M. (1978). Prevalence and types of dyslexia. In A.L. Benton & D. Pearl (Eds.), Dyslexia: An appraisal of current knowledge (pp. 3–28). New York: Oxford University Press.
24.
Rutter, M., & Yule, W. (1975). The concepts of specific reading retardation. Journal of Child Psychology and Psychiatry, 16, 181–197.
25.
Share, D.L., Jorm, A.F., Matthews, R., & Maclean, R. (1988). Lexical decision and naming times of young disabled readers with function and content words. Australian Journal of Psychology, 40, 11–18.
26.
Share, D.L., Jorm, A.F., McGee, R., Silva, P.A., Maclean, R., Matthews, R., & Williams, S. (1987). Dyslexia and other myths. Unpublished manuscript, University ofOtago Medical School, Dunedin, New Zealand.
27.
Share, D.L., McGee, R., McKenzie, D., Williams, S., & Silva, P.A. (1987). Further evidence relating to the distinction between specific reading retardation and general reading backwardness. British Journal of Developmental Psychology, 5, 35–44.
28.
Share, D.L., McGee, R., & Silva, P.A. (in press). IQ and reading progress: A test of the capacity notion of IQ. Journal of the American Academy of Child and Adolescent Psychiatry.
29.
Share, D.L., & Silva, P.A. (1987). Language deficits and specific reading retardation: Cause or effect?British Journal of Disorders of Communication, 22, 219–226.
30.
Siegel, L.S. (1984a). A longitudinal study of a hyperlexic child: Hyperlexia as a language disorder. Neuropsychologia, 22, 577–585.
31.
Siegel. L.S. (1984b). On the adequacy of the Wide Range Achievement Test (WRAT): A reply to Snart, Dennis, and Brailsford. Canadian Psychology, 25, 73–74.
32.
Siegel, L.S. (1985). Psycholinguistic aspects of reading disabilities. In L.S. Siegel & F.J. Morrison (Eds.), Cognitive development in atypical children (pp. 45–66). New York: Springer-Verlag.
33.
Siegel, L.S. (1986). Phonological deficits in children with a reading disability. Canadian Journal of Special Education, 2, 45–54.
34.
Siegel, L.S. (1988). Evidence that IQ scores are irrelevant to the definition and analysis of reading disability. Canadian Journal of Psychology, 42, 201–215.
35.
Siegel, L.S., & Feldman, W. (1983). Non-dyslexic children with combined writing and arithmetic difficulties. Clinical Pediatrics, 22, 241–244.
36.
Siegel, L.S., & Heaven, R. (1986). Defining and categorizing learning disabilities. In S. Ceci (Ed.), Handbook of cognitive, social and neuropsychological aspects of learning disabilities (Vol. 1, pp. 95–121). Hillsdale, NJ: Erlbaum.
37.
Siegel, L.S., & Linder, B.A. (1984). Short-term memory processes in children with reading and arithmetic learning disabilities. Developmental Psychology, 20, 200–207.
38.
Siegel, L.S., & Ryan, E.B. (1984). Reading disability as a language disorder. Remedial and Special Education, 5, (3), 28–33.
39.
Siegel, L.S., & Ryan, E.B. (1987). Subtypes of developmental dyslexia: The influence of definitional variables. Unpublished manuscript, Ontario Institute for Studies in Education, Toronto, Canada.
40.
Siegel, L.S., & Ryan, E.B. (1988). Development of grammatical sensitivity, phonological and short-term memory skills in normally achieving and learning disabled children. Developmental Psychology, 24, 28–37.
41.
Smith, M.D., Coleman, J.M., Dokecki, P.R., & Davis, E.E. (1977). Intellectual characteristics of school labeled learning disabled children. Exceptional Children, 43, 352–357.
42.
Stanovich, K.E. (1986). Matthew effects in reading: Some consequences of individual differences in the acquisition of literacy. Reading Research Quarterly, 21, 360–407.
43.
Stanovich, K.E. (1988). The right and wrong places to look for the cognitive locus of reading disability. Annals of Dyslexia, 38, 154–177.
44.
Taylor, H.G., Satz, P., & Friel, J. (1979). Developmental dyslexia in relation to other childhood reading disorders: Significance and clinical utility. Reading Research Quarterly, 15, 84–101.
45.
Van der Wissel, A., & Zegers, F.E. (1985). Reading retardation revisited. British Journal of Developmental Psychology, 3, 3–9.
46.
Vellutino, F. (1978). Toward an understanding of dyslexia: Psychological factors in specific reading disability. In A.L. Benton & D. Pearl (Eds.), Dyslexia: An appraisal of current knowledge (pp. 61–112). New York: Oxford University Press.
47.
Vellutino, F.R. (1979). Dyslexia: Theory and research. Cambridge, MA: MIT Press.
48.
Wechsler, D. (1974). Manual for the Wechsler intelligence scale for children–Revised, New York: Psychological Corp.
49.
Woodcock, R. W. (1973). Woodcock reading mastery tests. Circle Pines, MN: American Guidance Service.
50.
Yule, W. (1973). Differential prognosis of reading backwardness and specific reading retardation. British Journal of Educational Psychology, 43, 44–248.
