Specific reading disability/dyslexia is examined as the one type of learning disability for which research results are complete and consistent enough to suggest a model. The implications of this model are then considered for all achievement domains and a total of three types of learning disabilities (LD) emerge—specific language impairment, specific reading disability/dyslexia, and specific math disability. When the core symptoms and the secondary symptoms for these types of learning disabilities are considered separately, it becomes evident that these three types of learning disabilities can account for discrepancies in all of the academic domains included in federal and state definitions of LD. This resulting classification system links the findings from recent LD research, syndromes from neuropsychology, and the criteria that school districts are mandated to operationalize. The implications of the proposed classification system are discussed in relation to prevalence, diagnosis, and intervention.
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References
1.
AaronP. G. (1991). Can reading disabilities be diagnosed without using intelligence tests?Journal of Learning Disabilities, 24, 178–191.
2.
AaronP. G. (1995). Differential diagnosis of reading disabilities. School Psychology Review, 24, 345–360.
3.
AaronP. G.JoshiR. M. (1992). Reading problems: Consultation and remediation. New York: Guilford Press.
4.
AbbottR. D.BerningerV. W. (1993). Structural equation modeling of relationships among developmental skills and writing skills in primary- and intermediate-grades writers. Journal of Educational Psychology, 85, 478–508.
5.
AckermanP. T.DykmanR. A.OglesbyD. M. (1994). Visual event-related potentials of dyslexic children to rhyming and nonrhyming stimuli. Journal of Clinical and Experimental Neuropsychology, 16, 138–154.
6.
AdamsM. J.BruckM. (1993). Word recognition: The interface of educational policies and scientific research. Reading and Writing: An Interdisciplinary Journal, 5, 113–139.
7.
AllenD. A. (1989). Developmental language disorders in preschool children: Clinical subtypes and syndromes. School Psychology Review, 18, 442–451.
8.
AramD. M.HallN. E. (1989). Longitudinal follow-up of children with preschool communication disorders: Treatment implications. School Psychology Review, 18, 487–501.
9.
AramD. M.MorrisR.HallN. E. (1992). The validity of discrepancy criteria for identifying children with developmental language disorders. Journal of Learning Disabilities, 25, 549–554.
10.
BerningerV. W.HartT. M. (1992). A developmental neuropsychological perspective for reading and writing acquisition. Educational Psychologist, 27, 415–434.
11.
BerningerV. W.HartT. M.AbbottR. D.KarovskyP. (1992). Defining reading and writing disabilities with and without IQ: A flexible, developmental perspective. Learning Disability Quarterly, 15, 103–118.
12.
BerningerV. W.MizokawaD. T.BraggR. (1991). Theory-based diagnosis and remediation of writing disabilities. Journal of School Psychology, 29, 57–79.
13.
BerningerV. W.RutbergJ. (1992). Relationship of finger function to beginning writing: Applications to diagnosis of writing disabilities. Developmental Medicine and Child Neurology, 34, 198–215.
14.
BerningerV. W.WhitakerD. (1993). Theory-based branching diagnosis of writing disabilities. School Psychology Review, 22, 623–642.
15.
BishopD. V. M.AdamsC. (1990). A prospective study of the relationship between specific language impairment, phonological disorders, and reading retardation. Journal of Child Psychology and Psychiatry, 31, 1027–1050.
16.
BowersP. G.WolfM. (1993). Theoretical links among naming speed, precise timing mechanisms and orthographic skill in dyslexia. Reading and Writing: An Interdisciplinary Journal, 5, 69–85.
17.
CattsH. W. (1989). Speech production deficits in developmental dyslexia. Journal of Speech and Hearing Disorders, 54, 422–428.
18.
CattsH. W. (1996). Defining dyslexia as a developmental language disorder: An expanded view. Topics in Language Disorders, 16, 14–29.
19.
ClarkD. B.UhryJ. K. (1995). Dyslexia: Theory and practice of remedial instruction. Timonium, MD: York Press.
20.
De LucaJ. W.RourkeB. P.Del DottoJ. E. (1991). Subtypes of arithmetic-disabled children: Cognitive and personality dimensions. In RourkeB. P. (Ed.), Neuropsychological validation of learning disabilities subtypes (pp. 180–219). New York: Guilford Press.
21.
FeltonR. H.WoodF. B. (1992). A reading level match study of nonword reading skills in poor readers with varying IQ. Journal of Learning Disabilities, 25, 318–326.
22.
FleischnerJ. E. (1994). Diagnosis and assessment of mathematics learning disabilities. In LyonG. R. (Ed.), Frames of reference for the assessment of learning disabilities (pp. 441–458). Baltimore: Guilford Press.
23.
FleischnerJ. E.FrankB. (1979). Visual-spatial ability and mathematics achievement in learning disabled and normal boys. Focus on Learning Problems in Mathematics, 1, 7–22.
24.
FletcherJ. M.FrancisD.RourkeB. P.ShaywitzS. E.ShaywitzB. (1992). The validity of discrepancy-based definitions of reading disabilities. Journal of Learning Disabilities, 25, 555–561, 573.
25.
FletcherJ. M.SatzP. (1985). Cluster analysis and the search for learning disability subtypes. In RourkeB. P. (Ed.), Neuropsychology of learning disabilities (pp. 40–64). New York: Guilford Press.
26.
FoormanB. R. (1995). Research on the great debate: Code-oriented versus whole-language approaches to reading instruction. School Psychology Review, 24, 376–392.
27.
FoormanB. R.JenkinsL.FrancisD. J. (1993). Links among segmenting, spelling, and reading words in first and second grades. Reading and Writing: An Interdisciplinary Journal, 5, 1–15.
28.
GoughP. B.TunmerW. E. (1986). Decoding, reading, and reading disability. Remedial and Special Education, 7, 6–10.
29.
GoughP. B.WalshM. A. (1991). Chinese, Phoenicians, and the orthographic cipher of English. In BradyS. A.ShankweilerD. P. (Eds.), Phonological processes in literacy (pp. 199–210). Hillsdale, NJ: Lawrene Erlbaum Associates.
30.
HooverW. A.GoughP. B. (1990). The simple view of reading. Reading and Writing: An Interdisciplinary Journal, 2, 127–160.
31.
KamhiA. G.CattsH. W. (1991). Reading disabilities: Terminology, definitions, and subtyping issues. In KamhiA. G.CattsH. W. (Eds.), Reading disabilities: A developmental language perspective (pp. 35–66). Needham Heights, MA: Allyn and Bacon.
32.
KatzR. B. (1996). Phonological and semantic factors in the object-naming errors of skilled and less-skilled readers. Annals of Dyslexia, 46, 189–208.
33.
LundbergI. (1991). Phonemic awareness can be developed without reading instruction. In BradyS. A.ShankweilerD. P. (Eds.), Phonological processes in literacy (pp. 47–53). Hillsdale, NJ: Lawrence Erlbaum Associates.
34.
LyonG. R. (1995). Toward a definition of dyslexia. Annals of Dyslexia, 45, 3–27.
35.
LyonG. R. (1996). Learning disabilities. The Future of Children, 6, 54–76.
36.
MilesE. (1992). Reading and writing in mathematics. In MilesT. R.MilesM. (Eds.), Dyslexia and mathematics (pp. 58–69). London: Routledge.
37.
MillerS. P.StrawserS.MercerC. D. (1996). Promoting strategic math performances among students with learning disabilities. LD Forum, 21, 34–40.
38.
MoatsL. C.LyonG. R. (1996). Wanted: Teachers with knowledge of language. Topics in Language Disorders, 16, 73–86.
39.
OlsonR. K.ForsbergH.WiseB. W.RackJ. P. (1994). Measurement of word recognition, orthographic, and phonological skills. In LyonG. R. (Ed.), Frames of reference for the assessment of learning disabilities: New views on measurement issues (pp. 243–278). Baltimore: Paul Brookes Publishing.
40.
PadgetS. Y.KnightD. F.SawyerD. J. (1996). Tennessee meets the challenge of dyslexia. Annals of Dyslexia, 46, 51–72.
41.
PenningtonB. F. (1991). Diagnosing learning disorders: A neuropsychological framework. New York: Guilford Press.
42.
RackJ. P.SnowlingM. J.OlsonR. K. (1992). The nonword reading deficit in developmental dyslexia: A review. Reading Research Quarterly, 27, 28–53.
43.
ReschleyD. J. (1996). Identification and assessment of students with disabilities. The Future of Children, 6, 40–53.
44.
RiccioC. A.HyndG. W. (1993). Developmental language disorders in children: Relationship with learning disability and attention deficit hyperactivity disorder. School Psychology Review, 22, 696–709.
45.
RiccioC. A.HyndG. W. (1995). Contributions of neuropsychology to our understanding of developmental reading problems. School Psychology Review, 24, 415–425.
46.
RiccioC. A.HyndG. W. (1996). Neuroanatomical and neurophysiological aspects of dyslexia. Topics in Language Disorders, 16, 1–13.
47.
RourkeB. P. (1993). Arithmetic disabilities, specific and otherwise: A neuropsychological perspective. Journal of Learning Disabilities, 25, 1–25.
48.
RourkeB. P. (1994). Neuropsychological assessment of children with learning disabilities. In LyonG. R. (Ed.), Frames of reference for the assessment of learning disabilities: New views on measurement issues (pp. 475–514). Baltimore: Paul Brookes Publishing.
49.
RourkeB. P.TsatsanisK. D. (1996). Syndrome of nonverbal learning disabilities: Psycholinguistic assets and deficits. Topics in Language Disorders, 16, 30–44.
50.
RumseyJ. M.AndreasonP.ZametkinA. J.AquinoT.KingA. C.HamburgerS. D.PikusA.RapoportJ. L.CohenR. M. (1992). Failure to activate the left temporoparietal cortex in dyslexia. Archives of Neurology, 49, 527–534.
51.
ScarboroughH. S.DobrichW. (1990). Development of children with early language delay. Journal of Speech and Hearing Research, 33, 70–83.
52.
ShankweilerD.CrainS.KatzL.FowlerA. E.LibermanA. M.BradyS. A.ThorntonR.LundquistE.DreyerL.FletcherJ. M.StuebingK. K.ShaywitzS. E.ShaywitzB. A. (1995). Cognitive profiles of reading disabled children: Comparison of language skills in phonology, morphology, and syntax. Psychological Science, 6, 149–153.
53.
ShaywitzS. E. (1996). Dyslexia. Scientific American, 275, 98–104.
54.
SiegelL. (1989). IQ is irrelevant to the definition of learning disabilities. Journal of Learning Disabilities, 22, 469–479.
55.
SiegelL. (1992). An evaluation of the discrepancy definition of dyslexia. Journal of Learning Disabilities, 25, 618–629.
SnyderL. S.DowneyD. M. (1995). Serial rapid naming skills in children with reading disabilities. Annals of Dyslexia, 45, 31–49.
58.
StanovichK.SiegelL. (1994). Phenotypic performance profile of children with reading disabilities: A regression-based test of the phonological-core variable-difference model. Journal of Educational Psychology, 86, 24–53.
59.
StoneB.BradyS. A. (1995). Evidence for phonological processing deficits in less-skilled readers. Annals of Dyslexia, 45, 51–78.
60.
StrangJ. D.RourkeB. P. (1985). Arithmetic disability subtypes: The neuropsychological significance of specific arithmetical impairment in childhood. In RourkeB. P. (Ed.), Neuropsychology of learning disabilities (pp. 167–186). New York: Guilford Press.
61.
SwankL. K. (1994). Phonological coding abilities: Identification of impairments related to phonologically based reading problems. Topics in Language Disorders, 14, 56–71.
62.
TorgesenJ. K.WagnerR. K.RashotteC. A. (1994). Longitudinal studies of phonological processing and reading. Journal of Learning Disabilities, 27, 276–286.
63.
UhryJ. K.ShepherdM. J. (1993). Segmentation/spelling instruction as part of a first-grade reading program: Effects on Several measures of reading. Reading Research Quarterly, 28, 219–233.
64.
VellutinoF. R.ScanlonD. M. (1991). The preeminence of phonologically based skills in learning to read. In BradyS. A.ShankweilerD. P. (Eds.), Phonological processes in literacy (pp. 237–252). Hillsdale, NJ: Lawrence Erlbaum Associates.
65.
WeintraubS.MesulamM. M. (1983). Developmental learning disabilities of the right hemisphere: Emotional, interpersonal, and cognitive. Archives of Neurology, 40, 463–468.
66.
WolfM.ObregonM. (1992). Early naming deficits, developmental dyslexia and a specific-deficit hypothesis. Brain and Language, 42, 219–247.
67.
WoodF. B.FlowersD. L.BuchsbaumM.TallalP. (1991). Investigation of abnormal left temporal functioning in dyslexia through rCBF, auditory evoked potentials, and positron emission tomography. Reading and Writing: An Interdisciplinary Journal, 4, 81–95.
