Employing a large sample of children from Dutch regular elementary schools, this study assessed the contributing and discriminating values of reading disability (RD) and attention-deficit/hyperactivity disorder (ADHD) to two types of phonological processing skills, phonemic awareness (PA) and rapid automatized naming (RAN). A second objective was to investigate whether comorbidity of RD and ADHD should be considered as an additive phenomenon as to RAN and PA. A total of 1,262 children, aged 8 to 13 years, were classified as RD (n = 121), ADHD (n = 17), comorbid (RD+ADHD; n = 16), or control (n = 1,108). Phonological processing was assessed by standardized tests of PA and RAN. Disability groups were compared to each other and contrasted to the control group. Although results indicate substantial effects for all three disability groups on both types of phonological processing, and the RAN/PA compound measure in particular, effect sizes were considerably larger for the RD groups, as compared to the ADHD-only group. Theoretical and practical implications are discussed.
American Psychiatric Association. (2000). Diagnostic and statistical manual of mental disorders (4th ed., text revision). Washington, DC: Author.
2.
AugustG. J.GarfinkelB. D. (1990). Comorbidity of ADHD and reading disability among clinic-referred children. Journal of Abnormal Child Psychology, 18, 29–45.
3.
BentalB.TiroshE. (2007). The relationship between attention, executive functions and reading domain abilities in attention deficit hyperactivity disorder and reading disorder: A comparative study. Journal of Child Psychology and Psychiatry, 48, 455–463.
4.
BlomertL. (2006). Protocol Dyslexie Diagnostiek & Behandeling [Dyslexia protocol for diagnosis and intervention]. Diemen/Maastricht, Netherlands: Dutch Health Care Insurance Board/University of Maastricht.
5.
BoadaR.WillcuttE. G.PenningtonB. F. (2012). Understanding the comorbidity between dyslexia and attention-deficit/hyperactivity disorder. Topics in Language Disorders, 32, 264–284.
6.
BoldenJ.RapportM. D.RaikerJ. S.SarverD. E.KoflerM. J. (2012). Understanding phonological memory deficits in boys with attention-deficit/hyperactivity disorder (ADHD): Dissociation of short-term storage and articulatory rehearsal processes. Journal of Abnormal Child Psychology, 40, 999–1011.
7.
BowersP. G. (1995). Tracing symbol naming speed’s unique contributions to reading disabilities over time. Reading and Writing, 7, 189–216. doi:10.1007/BF01027185
8.
BrusB. T.VoetenM. J. M. (1979). Een minuut test: vorm A en B: verantwoording en handleiding : schoolvorderingstest voor de technische leesvaardigheid, bestemd voor het tweede tot en met het zesde leerjaar van het basisonderwijs [One minute test: A and B version: Justification and manual: School advancement test for word reading proficiency, intended for grades two through six of primary education]. Nijmegen, Netherlands: Berkhout.
9.
CattellJ. M. (1886). The time it takes to see and name objects. Mind, 11, 63–65. doi:10.2307/2247157
10.
CohenJ. (1973). Eta-squared and partial eta-squared in communication science. Human Communication Research, 28, 473–490.
11.
CohenJ. (1988). Statistical power analysis for the behavioral sciences (2nd ed.). Hillsdale, NJ: Lawrence Erlbaum.
12.
De GrootB. J. A.Van den BosK. P.MinnaertA. E. M. G.Van der MeulenB. F. (2015). Phonological processing and word reading in typically developing and reading disabled children: Severity matters. Scientific Studies of Reading, 19, 166–181. doi:10.1080/10888438.2014.973028
13.
De GrootB. J. A.Van den BosK. P.Van der MeulenB. F. (2014). Phonemic Analysis Test Revised (PHAT-R). Amsterdam, Netherlands: Pearson.
14.
De JongP. F.Van der LeijA. (1999). Specific contributions of phonological abilities to early reading acquisition: Results from a Dutch latent variable longitudinal study. Journal of Educational Psychology, 91, 450–476. doi:10.1037/0022-0663.91.3.450
15.
De JongP. F.Van der LeijA. (2003). Developmental changes in the manifestation of a phonological deficit in dyslexic children learning to read a regular orthography. Journal of Educational Psychology, 95, 22–40. doi:10.1037/0022-0663.95.1.22
16.
DencklaM. B.RudelR. (1974). Rapid “automatized” naming of pictured objects, colors, letters and numbers by normal children. Cortex, 10, 186–202. doi:10.1016/S0010-9452(74)80009-2
17.
DencklaM. B.RudelR. G. (1976). Rapid “automatized” naming (R.A.N.): Dyslexia differentiated from other learning disabilities. Neuropsychologia, 14, 471–479. doi:10.1016/0028-3932(76)90075-0
18.
EbejerJ. L.CoventryW. L.ByrneB.WillcuttE. G.OlsonR. K.CorleyR.SamuelssonS. (2010). Genetic and environmental influences on inattention, hyperactivity-impulsivity, and reading: Kindergarten to grade 2. Scientific Studies of Reading, 14, 293–316. doi:10.1080/10888430903150642
19.
EhriL. C. (2005). Learning to read words: Theory, findings, and issues. Scientific Studies of Reading, 9, 167–188. doi:10.1207/s1532799xssr0902_4
20.
GreggN.BandalosD. L.ColemanC.DavisJ. M.RobinsonK.BlakeJ. (2008). The validity of a battery of phonemic and orthographic awareness tasks for adults with and without dyslexia and attention deficit/hyperactivity disorder. Remedial and Special Education, 29, 175–190. doi:10.1177/0741932508315951
21.
Health Council of the Netherlands. (2000). Diagnosis and treatment of ADHD. The Hague: Author.
22.
HedgesL. V. (1981). Distribution theory for Glass’s estimator of effect size and related estimators. Journal of Educational and Behavioral Statistics, 6, 107–128. doi:10.3102/10769986006002107
23.
KirbyJ. R.DesrochersA.RothL.LaiS. S. V. (2008). Longitudinal predictors of word reading development. Literacy Development in Canada, 49, 103–110.
24.
KroeseJ. M.HyndG. W.KnightD. F.HiemenzJ. R.HallJ. (2000). Clinical appraisal of spelling ability and its relationship to phonemic awareness (blending, segmenting, elision, and reversal), phonological memory, and reading in reading disabled, ADHD, and normal children. Reading and Writing, 13, 105–131. doi:10.1023/A:1008042109851
25.
LanderlK.RamusF.MollK.LyytinenH.LeppänenP. H. T.LohvansuuK.Schulte-KörneG. (2013). Predictors of developmental dyslexia in European orthographies with varying complexity. Journal of Child Psychology and Psychiatry, 54, 686–694. doi:10.1111/jcpp.12029
26.
LanderlK.WimmerH. (2000). Deficits in phoneme segmentation are not the core problem of dyslexia: Evidence from German and English children. Applied Psycholinguistics, 21, 243–262.
27.
LegersteeJ. S.van der Reijden-LakemanI. A.Lechner-van der NoortM. G.FerdinandR. F. (2004). Bruikbaarheid verkorte versie wisc-rn in de kinderpsychiatrie [Applicability of a shortened version of the WISC-RN in child psychiatry]. Kind en adolescent, 25, 178–182. doi:10.1007/BF03060926
28.
LoganJ. A. R.SchatschneiderC.WagnerR. K. (2011). Rapid serial naming and reading ability: The role of lexical access. Reading and Writing, 24, 1–25.
29.
McGrathL. M.PenningtonB. F.ShanahanM. A.Santerre-LemmonL. E.BarnardH. D.WillcuttE. G.OlsonR. K. (2011). A multiple deficit model of reading disability and attention-deficit/hyperactivity disorder: Searching for shared cognitive deficits. Journal of Child Psychology and Psychiatry, 52, 547–557.
30.
PaloyelisY.RijsdijkF.WoodA.AshersonP.KuntsiJ. (2010). The genetic association between ADHD symptoms and reading difficulties: The role of inattentiveness and IQ. Journal of Abnormal Child Psychology, 38, 1083–1095. doi:10.1007/s10802-010-9429-7
31.
PurvisK. L.TannockR. (2000). Phonological processing, not inhibitory control, differentiates ADHD and reading disability. Journal of the American Academy of Child and Adolescent Psychiatry, 39, 485–494. doi:10.1097/00004583-200004000-00018
32.
RackJ. P. (1994). Dyslexia: The phonological deficit hypothesis. In FawcettR. N. E. A. (Ed.), Dyslexia in children: Multidisciplinary perspectives (pp. 5–37). London, UK: Harvester Wheatsheaf.
33.
RamusF.WhiteS.FrithU. (2006). Weighing the evidence between competing theories of dyslexia. Developmental Science, 9, 265–269.
34.
ScholteE. M.Van der PloegJ. D. (2004). ADHD Vragenlijst (AVL) [ADHD questionnaire (AQ)]. Houten, Netherlands: Bohn Stafleu van Loghum. (Original work published 1998)
35.
ShanahanM. A.PenningtonB. F.YerysB. E.ScottA.BoadaR.WillcuttE. G.DeFriesJ. C. (2006). Processing speed deficits in attention deficit/hyperactivity disorder and reading disability. Journal of Abnormal Child Psychology, 34, 585–602.
36.
SnowlingM. J. (2001). From language to reading and dyslexia. Dyslexia, 7, 37–46. doi:10.1002/dys.185
37.
StevensonJ.LangleyK. P. H.PaytonA.WorthingtonJ.OllierW.ThaparA. (2005). Attention deficit hyperactivity disorder with reading disabilities: Preliminary genetic findings on the involvement of the ADRA2A gene. Journal of Child Psychology and Psychiatry, 46, 1081–1088. doi:10.1111/j.1469-7610.2005.01533.x
38.
StringerR. W.ToplakM. E.StanovichK. E. (2004). Differential relationships between RAN performance, behaviour ratings, and executive function measures: Searching for a double dissociation. Reading and Writing, 17, 891–914. doi:10.1007/s11145-004-2770-x
39.
TannockR. (2013). Rethinking ADHD and LD in DSM-5: Proposed changes in diagnostic criteria. Journal of Learning Disabilities, 46, 5–25. doi:10.1177/0022219412464341
40.
Tiffin-RichardsM. C.HasselhornM.WoernerW.RothenbergerA.BanaschewskiT. (2008). Phonological short-term memory and central executive processing in attention-deficit-hyperactivity disorder with-without dyslexia—Evidence of cognitive overlap. Journal of Neural Transmission, 115, 227–234.
41.
TorgesenJ. K.WagnerR. K.RashotteC. A.RoseE.LindamoodP.ConwayT.GarvanC. (1999). Preventing reading failure in young children with phonological processing disabilities: Group and individual responses to instruction. Journal of Educational Psychology, 91, 579–593. doi:10.1037/0022-0663.91.4.579
42.
TorppaM.GeorgiouG.SalmiP.EklundK.LyytinenH. (2012). Examining the double-deficit hypothesis in an orthographically consistent language. Scientific Studies of Reading, 16, 287–315. doi:10.1080/10888438.2011.554470
43.
Van den BosK. P. (2008). Word-reading development, the double-deficit hypothesis, and the diagnosis of dyslexia. Educational and Child Psychology, 25, 51–69.
44.
Van den BosK. P.De GrootB. J. A. (2012, July). Development of word-reading speed differentially linked to the development of phonemic analysis skills and alphanumeric naming speed. Paper presented at the annual meeting of the Society for the Scientific Study of Reading, Montreal, Canada.
45.
Van den BosK. P.Lutje SpelbergH. C. (2010). Continu Benoemen en Woorden Lezen (CB&WL) [Test for continuous naming and word reading]. Amsterdam, Netherlands: Boom.
46.
Van den BosK. P.Lutje SpelbergH. C.ScheepstraA. J. M.De VriesJ. R. (1994). De Klepel [The Klepel, a test for pseudoword reading]. Amsterdam, Netherlands: Pearson.
47.
Van den BosK. P.ZijlstraB. J. H.Lutje SpelbergH. C. (2002). Life-span data on continuous-naming speeds of numbers, letters, colors, and pictured objects, and word-reading speed. Scientific Studies of Reading, 6, 25–49. doi:10.1207/S1532799XSSR0601_02
48.
Van den BroeckW. J. M. (1997). De rol van fonologische verwerking bij het automatiseren van de leesvaardigheid [The role of phonological processing in automatizing reading proficiency]. Unpublished doctoral thesis, Rijksuniversiteit Leiden, Leiden, Netherlands.
49.
Van De VoordeS.RoeyersH.VertéS.WiersemaJ. R. (2011). The influence of working memory load on response inhibition in children with attention-deficit/hyperactivity disorder or reading disorder. Journal of Clinical and Experimental Neuropsychology, 33, 753–764.
50.
VellutinoF. R.FletcherJ. M.SnowlingM. J.ScanlonD. M. (2004). Specific reading disability (dyslexia): What have we learned in the past four decades?Journal of Child Psychology and Psychiatry, 45, 2–40.
51.
WagnerR. K.TorgesenJ. K. (1987). The nature of phonological processing and its causal role in the acquisition of reading skills. Psychological Bulletin, 101, 192–212. doi:10.1037/0033-2909.101.2.192
52.
WagnerR. K.TorgesenJ. K.LaughonP.SimmonsK.RashotteC. A. (1993). Development of young readers’ phonological processing abilities. Journal of Educational Psychology, 85, 83–103. doi:10.1037/0022-0663.85.1.83
53.
WagnerR. K.TorgesenJ. K.RashotteC. A. (1999). CTOPP: Comprehensive Test of Phonological Processing. Austin, TX: PRO-ED.
54.
WagnerR. K.TorgesenJ. K.RashotteC. A.HechtS. A.BarkerT. A.BurgessS. R.GaronT. (1997). Changing relations between phonological processing abilities and word-level reading as children develop from beginning to skilled readers: A 5-year longitudinal study. Developmental Psychology, 33, 468–479. doi:10.1037/0012-1649.33.3.468
WillcuttE. G.PenningtonB. F. (2000). Comorbidity of reading disability and attention-deficit/ hyperactivity disorder: Differences by gender and subtype. Journal of Learning Disabilities, 33, 179–191. doi:10.1177/002221940003300206
57.
WillcuttE. G.PenningtonB. F.OlsonR. K.ChhabildasN.HulslanderJ. (2005). Neuropsychological analyses of comorbidity between reading disability and attention deficit hyperactivity disorder: In search of the common deficit. Developmental Neuropsychology, 27, 35–78.
58.
WillcuttE. G.PenningtonB. F.OlsonR. K.DefriesJ. C. (2007). Understanding comorbidity: A twin study of reading disability and attention-deficit/hyperactivity disorder. American Journal of Medical Genetics B, 144, 709–714.
59.
WimmerH. (1993). Characteristics of developmental dyslexia in a regular writing system. Applied Psycholinguistics, 14, 1–33. doi:10.1017/S0142716400010122
60.
WimmerH.MayringerH.LanderlK. (1998). Poor reading: A deficit in skill-automatization or a phonological deficit?Scientific Studies of Reading, 2, 321–340.
61.
WimmerH.MayringerH.LanderlK. (2000). The double-deficit hypothesis and difficulties in learning to read a regular orthography. Journal of Educational Psychology, 92, 668–680.
62.
WimmerH.MayringerH.RabergerT. (1999). Reading and dual-task balancing: Evidence against the automatization deficit explanation of developmental dyslexia. Journal of Learning Disabilities, 32, 473–478.
63.
WolfM.BowersP. G. (1999). The double-deficit hypothesis for the developmental dyslexias. Journal of Educational Psychology, 91, 415–438.
