Cognitive processes separating good and poor readers when IQ is covaried

In this paper we address the issue of separating reading disability from general intelligence in order to identify those cognitive processes which discriminate between poor and good readers when intelligence is covaried. Subjects were 140 Grade 5 and 6 students who were administered Lorge-Thorndike intelligence test (1964), a reading decoding test and cognitive tests which measure planning, attention-arousal and simultaneous-successive processing. The tests which emerged as discriminators between good and poor readers when Lorge-Thorndike full scale IQ was covaried, were three measures of successive processing (Sequence Repetition, Naming Time, Speech Rate) and a measure of selective attention, the familiar Stroop Color-Word test. Subsequently, a comparison of reading disabled high and low average IQ children confirmed that the four tests were performed poorly by both groups. All four tests involve the use of articulatory representation, confirming the important role speech-related processes play in reading (decoding). The results support the notion that deficient speech-related processes may be the central problem of the majority of poor readers, especially those of above-average intelligence. Future directions for research on phonological coding and articulation were suggested.     

The Contribution of RAN Pause Time and Articulation Time to Reading Across Languages: Evidence From a More Representative Sample of Children

We examined the relationship between rapid automatized naming (RAN) components—articulation time and pause time—and reading fluency across languages varying in orthographic consistency. Three hundred forty-seven Grade 4 children (82 Chinese-speaking Taiwanese children, 90 English-speaking Canadian children, 90 Greek-speaking Cypriot children, and 85 Finnish-speaking children) were assessed on RAN (colors and digits) and reading fluency (word reading efficiency and text reading speed). The results showed that articulation time accounted for more unique variance in reading in the alphabetic orthographies than in Chinese, and pause time for more unique variance in reading in Chinese than in alphabetic orthographies. If automaticity in RAN is manifested with a higher contribution of articulation time to reading fluency than pause time and with a strong relationship between articulation time and pause time, then our findings suggest that automaticity in RAN is reached earlier in alphabetic orthographies than in Chinese.     

The relative roles of IQ and cognitive processes in reading disability

The purpose of the present study was to explore the relative roles of IQ and cognitive processes in reading performance. A sample of 443 Spanish children (264 male, 179 female) ranging in age from 7 to 13 years were classified into four groups according to IQ scores (<80, 80–90, 90–110, >110) and reading disabled (RD) and normally achieving readers (NR) were compared. The findings indicate that IQ scores were not related to the differences between children with RD and NR. We found that reading‐related cognitive deficits do differentiate between RD and NR children. Therefore, IQ scores do not make a significant contribution to our understanding of reading disability.     

Cognitive processing rates among disabled and normal reading young adults: A nine year follow-up study

Forty adults who had been diagnosed as reading disabled when they were children and 40 adults from a matched control group of normal readers were tested to assess the diagnostic utility of a newly developed set of tests as well at to ascertain whether or not reading disability persists into early adulthood. The new measures, designed to examine cognitive processing rates in disabled and normal adult readers, included expressive verbal fluency, confrontation naming, and perceptual speed. Evidence for significantly slower cognitive processing rates and persistent problems in reading and spelling was apparent among the young adult disabled readers. Spatial and mathematical ability levels were well within the normal range.     

Substance use, substance abuse, and LD among adolescents with a childhood history of ADHD

A clinic-referred sample of 109 children with attention-deficit/hyperactivity disorder (ADHD) was followed into adolescence for the ascertainment of alcohol and other drug use and abuse. Learning disability (reading or math) in childhood was examined as a predictor of adolescent substance use and substance use disorder for alcohol and marijuana. No statistically significant group differences for children with LD versus those without LD emerged even after using different methods to compute LD. IQ/achievement discrepancy scores were similarly not predictive of later use or abuse. However, children with ADHD who had higher IQs and higher levels of academic achievement in childhood were more likely to try cigarettes, to smoke daily, and to have their first drink of alcohol or first cigarette at an early age. Children with ADHD who had higher reading achievement scores were less likely to have later alcohol use disorder. Although these findings are necessarily preliminary, due to the small number of children interviewed, the pattern of results suggests that level of cognitive functioning--rather than discrepancy between IQ and achievement--is important for the prediction of later substance use and abuse, at least in this clinic-referred sample of children with ADHD. Further, different mechanisms of risk related to cognitive functioning may be operating for experimentation with legal drugs such as alcohol and tobacco, regular cigarette smoking, and problematic alcohol use.     

Long-term outcome of the early identification and intervention of reading disabilities

This study examined the longitudinal effects of an early literacy intervention in Kindergarten. A group of children completed reading and cognitive measures between Kindergarten (5–6 years old) and Grade 7 (12–13 years old). Our results showed that 22 % of children were identified as at-risk for reading deficits in Kindergarten, but only 6 % of children had reading difficulties in Grade 7. In Kindergarten, at-risk groups scored lower than not-at-risk groups on measures of word and letter recognition, phonological processing, rapid naming, working memory, and language. We also examined a small group of children who were not-at-risk in Kindergarten, but had a reading disability in Grade 7; these children did not obtain lower scores than average readers on any of our Kindergarten measures. Finally, we illustrated that the trajectory of word reading skills was generally stable, such that most children scored within the average range between Grade 1 and 7. Our results provide evidence for the long-term positive outcomes of early literacy instruction.     

Arithmetic processing in children with spina bifida: Calculation accuracy, strategy use, and fact retrieval fluency

Three studies compared 98 children with spina bifida myelomeningocele (SBM)-a disorder associated with high rates of math disability and spatial deficits-to 94 typically developing children on multidigit subtraction and cognitive addition tasks. Children with SBM were classified into those with reading decoding and math disability, only math disability, and no reading or math disability. Study 1 showed that visual-spatial errors in multidigit arithmetic were not elevated in children with SBM. In Study 2, deficits in accuracy, speed, and strategy-use in single-digit addition characterized groups with math disability regardless of reading status. Accuracy and speed on single-digit addition was strongly related to performance on multidigit subtraction. A math-level matching design in Study 3 revealed less mastery of math facts by the group with SBM. The results are discussed with reference to cognitive and neuropsychological models of math disability.     

Specific reading disability: Follow-up studies

Twenty-four children with specific reading disability, originally studied and treated at the Bellevue Hospital Mental Hygiene Clinic between 1949 and 1951, were reexamined as young adults between 1961 and 1962 with the battery of tests given to them ten to 12 years before. Their specific perceptual problems and evidence of lack of clear- out cerebral dominance persists, although in less severe form. Those patients who as children had neurological signs in addition to the specific reading disability showed less improvement than those who had none.     

Understanding the relations between RAN letter subtest components and word reading in first-grade students

First-grade students (N = 221) were individually tested on a battery of cognitive and achievement measures of verbal fluency, visual attention, phonological awareness, orthographic recognition, rapid automatized naming (RAN) of letters and objects, and reading. All tests were subjected to postacquisition scoring, and all RAN measures were segregated into measures of articulation time, pause time, and consistency of the pause time. Structural equation modeling demonstrated that word reading was directly and significantly predicted by RAN letter naming and general RAN cognitive processing time of objects. Moreover, RAN letter reading constructs were significantly and directly predicted by the latent variables of phonological awareness, orthographic recognition, and general RAN object articulation and cognitive processing times. RAN letter naming constructs were also significantly and indirectly predicted by visual attention. The reading model was found to be consistent with a total mediation of the relation of phonological awareness and reading through RAN letter naming and supported the validity of the RAN letter naming subtest as a basic letter reading test. These findings supported the double-deficit hypothesis for letter reading. We suggest that phonological memory is a basic factor underlying general RAN cognitive processing time of objects and domain-specific information associated with phonemes and their graphic representations.     

Different RAN components relate to reading at different points in time

The present 10-year longitudinal study examined how rapid automatized naming (RAN) components—articulation time and pause time—relate to reading fluency. Seventy-five Greek-speaking children were followed from Grade 1 to Grade 10 and were assessed five times (in Grades 1, 2, 4, 6, and 10) on RAN (digits and objects) and reading fluency (word reading efficiency, phonemic decoding efficiency, and text reading fluency). The results indicated first that a substantial amount of variance in reading fluency was accounted for by what articulation time and pause time shared. In addition, the unique contribution of pause time to reading fluency decreased across time and the unique contribution of articulation time increased across time. Viewed in conjunction with the developmental changes in the RAN components, our findings suggest that the RAN tasks are processed and executed in different ways across time.     

Subtypes of developmental dyslexia: The influence of definitional variables

The purpose of this study was to investigate the hypothesis that the manner in which a reading disability is defined will influence the conclusions that are made about the characteristics of the disability. To test this hypothesis, learning disabled and normally achieving children, aged 6 to 14, were administered tasks measuring grammatical, shortterm memory, phonological, reading, and visual-spatial skills. The poor readers were divided into groups of poor readers with

The Effect of Articulatory Suppression on Greek Children's Reading of Greek

Abstract The objective of this study was to investigate the role of phonological recoding in young children's reading of Greek. For this, third‐grade Greek children were asked to read and comprehend text while they were concurrently suppressing subvocal articulation. Their performance (in terms of reading times and free recall) was compared to that of a control group of normal reading. The results showed a disturbing effect of articulatory suppression on the subjects’ reading latencies and retention of text. These findings were taken to imply that third‐grade children's reading of text was partly based upon pre‐lexical phonological representation and also that their retention of text partly depended upon a phonological memory code.     

The effects of a comprehensive reading intervention programme for Grade 3 children

A group of 37 8‐year‐old children who had scored below the 20th percentile on a national reading test were offered intensive reading instruction in groups of four during Grade 3 in two periods (10 and 5 weeks). The intervention was delivered by six teachers who received training in a comprehensive reading intervention programme called Epi‐Meta‐Mastery‐Approach, designed on the basis of the theory of metalinguistic development ( Gombert, 1992 ). A control group of 36 children received increased instructional intensity during the same periods. The intervention group showed gains in comparison with the control group on measures of word and non‐word reading and spelling.     

Specificity and parameters in defining dyslexia

Conclusion The concern for specificity in definition on the part of researchers and policy makers is understandable. Those on the line, confronted by children who need to be helped, and those who have a working familiarity with the complexity of the reading process, and of the reading disability syndrome, may share my reservations about this specificity: that in defining reading disability strictly in terms of a significant deviation from IQ restrictions are imposed that may obscure important aspects and interactions in the clinical picture. I am in favor of careful selection of samples and of persistence in the search for better defining parameters. Until we have them it may be desirable to operate within looser guidelines and to base treatment on a careful evaluation of linguistic, cognitive, emotional and cultural functioning, when the aim is to teach individual children. If Alexander Pope’s admonition (in “An Essay on Criticism,” Part I) is kept in mind we should not go too far astray: First follow Nature, and your judgment frame By her just standard... This paper was presented at the pre-conference symposium on the definition of dyslexia at the 29th Annual Conference of the Orton Society, Minneapolis, November 1978.     

The validity of discrepancy-based definitions of reading disabilities.

This study addressed the validity of distinguishing children with reading disabilities according to the presence or absence of discrepancies between intelligence test scores and academic achievement. Three definitions of reading disability were used to provide criteria for five groups of children who (a) met a discrepancy-based definition uncorrected for the correlation of IQ and achievement; (b) met a discrepancy-based definition correcting for the correlation of IQ and achievement; (c) met a low achievement definition with no IQ discrepancy; (d) met criteria a and b; and (e) met none of the criteria and had no reading disability. Comparison of these five groups on a set of 10 neuropsychological tests corrected for correlations with IQ showed that group differences were small and accounted for little of the variability among groups. These results question the validity of segregating children with reading deficiencies according to discrepancies with IQ scores.     

Predicting reading comprehension of narrative and expository texts among Hebrew-speaking readers with and without a reading disability

The aim of this study was to investigate which cognitive and reading-related linguistic skills contribute to reading comprehension of narrative and expository texts. The study examined an Israeli national database of Hebrew-speaking readers in fourth grade, from which a subsample of 190 readers with a reading disability (RD) and 190 readers with no reading disability (NRD) was selected. IQ, text reading, reading comprehension, and various linguistic and cognitive skills were assessed. Structural equation modeling results suggested that both groups rely on lower level processes such as text reading accuracy and orthographic knowledge for reading comprehension of both genres. However, RD readers depend more heavily upon these lower level processes compared with NRD for whom higher level processes contribute more to reading comprehension. The various variables accounted for only 25-34% of reading comprehension variance, and possible explanations are discussed. Taken together, these findings highlight the variety of factors influencing reading comprehension and its multidimensional nature.     

Do the effects of computer-assisted practice differ for children with reading disabilities with and without IQ-achievement discrepancy?

This study was designed to assess whether the effects of computer-assisted practice on visual word recognition differed for children with reading disabilities (RD) with or without aptitude-achievement discrepancy. A sample of 73 Spanish children with low reading performance was selected using the discrepancy method, based on a standard score comparison (i.e., the difference between IQ and achievement standard scores). The sample was classified into three groups: (1) a group of 14 children with dyslexia (age M = 103.85 months; SD = 8.45) who received computer-based reading practice; (2) a group of 31 "garden-variety" (GV) poor readers (age M = 107.06 months; SD = 6.75) who received the same type of instruction; and (3) a group of 28 children with low reading performance (age M = 103.33 months; SD = 9.04) who did not receive computer-assisted practice. Children were pre- and posttested in word recognition, reading comprehension, phonological awareness, and visual and phonological tasks. The results indicated that both computer-assisted intervention groups showed improved word recognition compared to the control group. Nevertheless, children with dyslexia had more difficulties than GV poor readers during computer-based word reading under conditions that required extensive phonological computation, because their performance was more affected by low-frequency words and long words. In conclusion, we did not find empirical evidence in favor of the IQ-achievement discrepancy definition of reading disability, because IQ did not differentially predict treatment outcomes.     

CHILDREN RECEIVING REMEDIAL TEACHING IN READING

Over 1,200 children receiving remedial teaching in reading were studied on ten main variables: IQ, chronological age, mental age, initial reading age, reading age after treatment, treatment length, number of attendances, percentage attendance, size of teaching group, and improvement. Sex distribution and laterality patterns were also examined.

The findings of many previous smaller studies were in general borne out. In particular, little relationship was found between lateral dominance and reading disability or between intelligence as measured and reading improvement. Only when groups contained more than six children did group size affect progress adversely. Further studies are in hand.     

Validity of school history as a diagnostic criterion for reading disability

In order to assess the validity of school history information as a diagnostic criterion for reading disability, reading performance data from 304 children with a positive history for reading problems were compared to those from 319 children with a negative school history. These children are members of twin pairs who are participants in the Colorado Reading Project (DeFries 1985). A multivariate analysis of variance of Reading Recognition, Reading Comprehension, and Spelling subtest scores from the Peabody Individual Achievement Test (Dunn and Markwardt 1970) yielded a highly significant (p <0.001) difference between groups for both the multivariate and univariate comparisons. The difference between the unweighted mean scores of the school-history positive and negative groups for Reading Recognition was 2.1 standard deviations. Moreover, when discriminant weights estimated from an independent sample of 140 reading-disabled and 140 control nontwin children were used to reclassify the sample of twins, 75% of those with a positive history for reading problems were classified as being reading disabled and 95% of those with a negative history were classified as unaffected. Thus, results of this study establish the validity of school history information and suggest that such information may have considerable utility for ascertaining samples of reading-disabled children.     

An investigation of grapheme parsing and grapheme-phoneme knowledge in two children with dyslexia

The aim of this study was to understand the relationship between children’s knowledge of letter-sound rules (“grapheme-phoneme knowledge”) and their ability to identify separate graphemes (e.g., SH, OI) that comprise words (“grapheme parsing”). We used a single-case study approach with children with phonological dyslexia who were able to read words accurately via whole-word processes (“lexical reading”), but were not able to read using grapheme-phoneme knowledge (“non-lexical reading”). These children were able to correctly parse some graphemes without grapheme-phoneme knowledge for these graphemes. However, they were unable to correctly parse some graphemes for which they had grapheme-phoneme knowledge. This dissociation suggests that children may acquire grapheme-phoneme knowledge and phoneme parsing independently. We discuss the implications of these findings for cognitive models of word reading.