Sound links in reading and spelling with discrepancy-defined dyslexics and children with moderate learning difficulties

This study reports the effects of a highly structuredindividually administered remedial teaching programmefor children with reading difficulties. Thephonological awareness, reading accuracy and spellingattainments of 28 children diagnosed as having low IQ(Mean IQ = 66, SD = 5.3) were compared with those of29 children diagnosed as having discrepancy defineddyslexia (Mean IQ = 95, SD = 8.4). The responsivenessto intervention of each group was also compared withteacher-referred reading-delayed children matched forinitial literacy skills. For reading accuracy andphonological awareness the dyslexic group respondedmore successfully than the low IQ group. The twogroups did not differ significantly on spelling. It isargued that the reading accuracy and phonologicalawareness results are in keeping with thephonological-core variable-difference (Stanovich &Siegel 1994) model of reading disability and that thegains of all groups on all measures were such thatthere is no obvious benefit in using IQ to selectchildren for a programme of individual teaching whichcombines reading with phonological awarenesstraining.     

Exploring connections among reading,spelling, and phonemic segmentation during first grade

Exploratory data analysis was used to examine changes in individual reading and spelling patterns during first grade. Subjects were from classrooms receiving, on average, 45 minutes compared to 15 minutes of daily letter-sound instruction. Subjects spelled and read 60 words in October, February, and May, and deleted sounds from spoken words. Spelling and reading responses progressed from nonphonetic, to phonetic, to correct. Additionally, knowledge of a word's spelling informed its reading, while the converse was less apparent. Finally, those slow to improve in phoneme deletion were also slow to spell and read phonetically, especially among subjects receiving less instruction in letter-sound relations.     

The spelling performance of ESL and native speakers of English as a function of reading skill

Seventy-nine children in grade two spelled pseudowords and real words differing in vowel quality and the presence or absence of consonant clusters, and their accuracy was examined as a function of native language and reading ability. Because of the heavy reliance on phonological processing in spelling, we hypothesized that poor readers, who typically exhibit impaired ability to sequence, segment and transform phonemes into graphemes, would spell more poorly than average readers. This hypothesis was substantiated. Second language speakers also displayed phonological deficits relative to native speakers, and we hypothesized that this deficit would also be obvious in spelling accuracy. However, second language speakers performed in a manner similar to native speakers. Supporting this are findings from multiple regressions showing that the processing profiles of second language speakers and native speakers are strikingly similar, and that only poor readers of both language backgrounds diverge from the common patterns and display pervasive phonological deficits.     

Correlates of spelling abilities in children with early speech sound disorders

The correlates of spelling impairment wereexamined in children with histories of earlyspeech sound disorders. The spelling errors of52 children with histories of speech sounddisorders were analyzed to predict theassociation between weaknesses in expressivelanguage skills in early childhood andschool-age spelling abilities. Resultsrevealed that children with preschool speechsound and language problems became poorerspellers at school age than did children withpreschool speech sound disorders only. However, even children with isolated speechsound disorders demonstrated a weakness inspelling skills relative to their reading andlanguage abilities and Weschler Performance IQ.Measures of phonological awareness were highlycorrelated with spelling skills, suggestingthat phonological processing abilities arerelated to the ability to spell phoneticallypredictable words. Analysis of spelling errorsbased on level of phonological awareness skillrevealed that children with preschool speechsound disorders utilize phonetic strategies inspelling phonetically predictable words. Familial aggregation of spelling disorderssuggests a possible genetic component that ismodified by gender.     

Differential genetic etiology of reading disability as a function of mathematics performance

In order to assess the etiology of reading disability as a function of mathematics performance, data from 168 monozygotic (MZ) and 127 same-sex dizygotic (DZ) twin pairs in which at least one member of each pair was reading-disabled were subjected to quantitative genetic analyses. MZ and DZ concordance rates for reading disability were computed for different levels of mathematics performance, and reading performance data were fitted to an extension of the basic multiple regression model for the analysis of selected twin data. Results of these analyses suggest that genetic factors may be especially salient as a cause of reading disability in children with borderline deficits in mathematics performance: thus, mathematics performance may be a valid dimension for diagnosing subtypes of reading disability.     

Etiology of reading difficulties as a function of gender and severity

To test the hypothesis that the etiology of reading difficulties may differ for males and females in more severely impaired samples, reading performance data from monozygotic (MZ), same-sex dizygotic (DZ_ss), and opposite-sex dizygotic (DZ_os) twin pairs were analyzed using a model-fitting implementation of the DeFries-Fulker (DF) model (Purcell & Sham, 2003, Behavior genetics, 33, 271–278). Five non-independent samples were selected using cut-offs of −1 (N = 737 pairs), −1.5 (N = 654), −2 (N = 468), −2.5 (N = 335), and −3 (N = 198) standard deviations (s) below the mean composite reading score of control twins. Male/female gender ratios for children with reading difficulties were significantly higher than 1.0 for all five samples and increased as a function of severity (viz., 1.15, 1.17, 1.40, 1.61, and 1.88, respectively). When the DF model was fit to the data, estimates of heritability (h _g²) and shared environmental influences (c _g²) were not significantly different for males and females in any of the groups. Consequently, the most parsimonious model that provided a good fit to the data at all five levels of severity equated the heritabilities and shared environmental influences for males and females, and fixed the DZ_os coefficient of genetic relatedness at 0.5. Thus, these results provide no evidence for a differential etiology of reading difficulties as a function of gender in more severely impaired samples, and suggest that the same genetic and environmental influences contribute to reading difficulties in males and females, irrespective of severity.     

Introduction to the special issue on genes, environment, and reading

This introduction to the special issue on Genes, Environment, and Reading presents an overview of the background for behavior- and molecular-genetic research on dyslexia and individual differences across the normal range. The general methods, questions addressed, and selected results are summarized for each of the papers in the order of their presentation in the special issue. Concluding comments reflect on the influence of environmental range on estimates of genetic and environmental influences, and the future of behavior- and molecular-genetic research on reading.     

The Processing of Inflectional Morphology: A Comparison of Children with and without Dyslexia

Children aged 11–12 years with a diagnosis of dyslexia (DR) were compared to chronological and reading-age matched poor readers (PR), and two normal reader groups, age-matched (CA) and spelling and reading-age matched (SA–RA), on their processing of inflectional morphology. In comparison to SA–RAs and PRs, the DRs made more spelling errors on regular past tense verb endings relative to irregular past tense verbs and non-verbs. In reading, the DRs took longer than the other groups to make decisions in the written but not oral condition of a tense judgement task. In addition, they were less affected than the PR and SA–RA groups by case altered disruption to the morpheme boundary of inflected verbs. The findings suggest dyslexic children do not show deficits in morphological processing in spoken language, but they are slower at reading and less accurate at spelling regularly inflected verbs compared with normally developing younger children. This difference could plausibly be accommodated within the Phonological Deficit Hypothesis of dyslexia.     

Orthographic and phonological coding during visual word matching as related to reading and spelling abilities in college students

College students, scoring average to above-average on WRAT-R subscales for reading and spelling, made match/nonmatch judgments on word pairs either on the basis of phonological similarity (a rhyme match) or orthographic similarity (a visual match). Word pairs rhymed and looked similar, rhymed but looked dissimilar, or looked similar but did not rhyme. Word pairs for which a nonmatch decision had to be made, despite similarity in the irrelevant dimension, produced significantly more errors and longer response latencies. Poorer readers were less vulnerable to phonological interference when making visual discriminations, and poorer readers and spellers were more vulnerable to orthographic interference when making rhyme matches. Results showed that a deficiency in phonological coding and an over-reliance upon orthographic coding, often observed in dyslexic children, can also be seen in relatively poor readers and spellers within a normal adult population.     

Development of decoding,reading comprehension,vocabulary and spelling during the elementary school years

The goal of this study was (1) to investigate the development of decoding(efficiency), reading comprehension, vocabulary and spelling during theelementary school years and (2) to determine the differences between poor,average and good performers with regard to the development of theseskills. Twice each year two standardized tests for each skill wereadministered. For two successive periods, one of the tests for each skill wasthe same. To describe the development in terms of a latent variable evolvingacross grades, the structured-means version of the structural equationmodel was used. The growth was expressed in terms of effect size. Withrespect to the first question, clear seasonal effects were found for readingcomprehension, vocabulary and spelling, while the seasonal effect fordecoding efficiency was restricted to the early grades. Progress tended tobe greater from fall to spring than from spring to fall. For decodingefficiency, and to a lesser degree for vocabulary and spelling, growthshowed a declining trend across grades. For reading comprehension, theprogress in grade 2 was lower than the progress in grade 3, but progresswas declining across higher grades. With respect to the second question,it appeared that initially low performers on reading comprehension,vocabulary and spelling tended to show a greater progress, especially inperiods where the largest amount of instruction was given. Although it wasfound that the low, medium and high ability groups remain in the sameorder, as far as their means are concerned, these findings do not confirmthe existence of a Matthew effect for reading comprehension, vocabularyand spelling. For decoding efficiency no clear differential effect could befound: the gap between the poor and good performers did not widen overtime for this skill.     

Links among segmenting,spelling, and reading words in first and second Grades

Twenty first graders and twenty second graders were examined on skills in segmenting, reading, and spelling 50 words with regular and exceptional spelling patterns. By using the same words for each task, it was possible to assess the interrelationships among these skills on a word by word, child by child basis. A multivariate analysis of variance was conducted on difference scores among segmentation, reading, and spelling. Generally, differences favored segmentation and were maximized when final sounds were deleted and minimized when medial sounds were deleted. In addition, graphical analyses showed a greater probability of correct reading and spelling given correct segmentation than incorrect segmentation. Results were interpreted to support a computational notion of phonology as a prerequisite to reading and spelling, with a more reflective notion explaining the reciprocal relation between reading and segmentation of consonant blends and medial sounds.     

The Universal and the unique in dyslexia: A cross-linguistic investigation of reading and reading fluency in Hebrew-and English-speaking children with reading disorders

Cross-linguistic studies provide a unique tool for the identification of universal processes in oral and written language, both in development and in breakdown (Annual Review of psychology, 52, 369–396). Examining the differential strengths and weaknesses of children with dyslexia in contrasting orthographies can help illumine both the more universal aspects of reading disabilities, as well as their individual language-specific attributes. The aim of this study, was to investigate the shared and distinctive characteristics of readers with dyslexia on reading and reading fluency across Hebrew and English orthographies. Differences between 60 Hebrew and English-speaking children with dyslexia on a battery of cognitive, linguistic, and reading measures will be discussed along with theoretical implications.     

Genetic etiology of spelling deficits in the Colorado and London twin studies of reading disability

The basic multiple regression model for the analysis of selected twin data (DeFries and Fulker 1985, 1988) was fitted to spelling data from 100 pairs of MZ twins and 71 pairs of same-sex DZ twins tested in the Colorado Reading Project (DeFries, Olson, Pennington and Smith 1991), and to data from 12 pairs of MZ twins and 15 pairs of same-sex DZ twins tested in the London twin study of reading disability (Stevenson, Graham, Fredman and McLoughlin 1984, 1987). Estimates of h _g ² obtained from analyses of these data suggest that about 60% of the deficit of probands is due to heritable influences in both samples. When a regression model was fitted separately to data from males and females in the combined Colorado and London samples, resulting estimates of h _g ² were 0.66±0.18 and 0.56±0.19, respectively, a nonsignificant difference. Collaborative analyses of data from additional twin studies of reading disability would facilitate more rigorous tests of hypotheses of differential genetic etiology as a function of group membership.     

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

Seventy-eight 8-to-12-year-old children (34 ReadingDisabled; 31 Attention-Deficit-Hyperactivity-Disordered; and 13diagnosed normal controls) were given a battery oftests including cognitive, linguistic, academic,phonemic awareness, and memory tests. As part of theacademic battery an 8-point spelling rating scale wasdeveloped (Rating Scale) that resulted in threedifferent scores which reliably discriminated amongthe three groups. Relationships between phonemicawareness, phonological memory, reading and spellingwere explored. Zero-order and second-ordercorrelations were completed with indications thatphonemic awareness tasks (elision, blending, reversal,and segmenting) and phonological memory (WISC-IIIDigit Span) are significantly correlated with readingdecoding and spelling measures with slightly highercorrelations with the Rating Scale. Regressionanalyses resulted in a large proportion of thevariance on reading and spelling tasks accounted forby phonemic awareness (particularly elision andreversal) and phonological memory. The ReadingDisabled group was found to produce more errors thatwere phonetically inaccurate than the other twogroups. The demand of spelling ten ``error' wordsbeyond the RD students' achievement level appeared toelicit greater weaknesses in their phonologicalrecoding abilities than in those of the ADHD ornormally achieving students.     

Text-to-speech,text, and hypertext: Reading and spelling with the computer

This paper introduces the Special Issue on the use of text-to-speech computer systems and hypertext to aid reading and spelling. It discusses (1) the analysis-by-synthesis principle of text-to-speech conversion, (2) some classroom and research issues in designing usable computer texts, and (3) the criteria of hypertext. The paper emphasizes the importance of the contextual aspects of text and hypertext and situated learning.     

Reading and spelling among nonvocal children with cerebral palsy: Influence of home and school literacy environment

In literacy research, home literacy experiences and exposure to print have been ascribed a contributing role in later reading development along with metalinguistic and other cognitive skills. In a study on reading and spelling skills in nonvocal children the home and school literacy experiences of 35 children with cerebral palsy were studied by means of questionnaires. The questionnaires were completed by the parents and teachers. The answers from the disability group were compared with the answers from two comparison groups, one matched for mental age and sex and the other for sex and IQ. The results revealed few differences in the home literacy experiences of the three groups. The children of all three groups had access to a variety of printed materials, and there were no differences in the parents' reading habits or in their values and high priority given to literacy. The disabled children took a passive role in story reading with little linguistic interaction, and the parents took the active part. The results indicated that home literacy experiences in the groups studied at best had a marginal influence on reading development. Individual differences in speech and language abilities were proposed to have higher explanatory value of the low literacy skills found among nonvocal children.     

The relationship between linguistic characteristics and reading/writing performances of Norwegian children

The relations between different word categories and children's reading and writing performances were examined in twenty 9-year-old children. Results indicated for Norwegian, which is more regular than English but less regular than Finnish, that the length and the frequency of words and their interactions are factors substantially related both to children's reading, writing time (writing velocity), and spelling performances, whereas the regularity factor affected children's spelling only. Significant intercorrelations among reading and writing (accuracy and spelling) measures were found.     

The role of decoding in reading research and instruction

This paper introduces the special issue on decoding by discussing the role of decoding in the framework of reading research and current instructional issues. It briefly describes the contributions of the seven authors by presenting their key conceptions related to typical and atypical learners. The paper emphasizes the importance of decoding as part of the reading and language arts curriculum and provides instructional implications. Decoding is especially important to consider at this time, since instruction in reading, throughout the United States, is all but excluding systematic decoding instruction as it moves to the whole language, literature-based approaches. While many children may learn to read without difficulty using literature-based approaches, many children may fail to pick up the code.     

The Relationship of Spelling Recognition, RAN, and Phonological Awareness to Reading Skills in Older Poor Readers and Younger Reading-Matched Controls

The role of spelling recognition was examined in word reading skills and reading comprehension for dyslexic and nondyslexic children. Dyslexic and nondyslexic children were matched on their raw word reading proficiency. Relationships between spelling recognition and the following were examined for both groups of children: verbal ability, working memory, phonological measures, rapid naming, word reading, and reading comprehension. Children’s performance in spelling recognition was significantly associated with their skills in word reading and reading comprehension regardless of their reading disability status. Furthermore, spelling recognition contributed significant variance to reading comprehension for both dyslexic and nondyslexic children after the effects of phonological awareness, rapid naming, and word reading proficiency had been accounted for. The results support the role of spelling recognition in reading development for both groups of children and they are discussed using a componential reading fluency framework.     

Distinctive patterns of relationship of phonological awareness and working memory with reading development

The purpose of this study was to assess the contributions of specific components of verbal and nonverbal working memory and of phonological awareness to the prediction of reading achievement. One hundred and three children from grades 1, 2, and 3 were administered a measure of phonological awareness, four measures of working memory, four measures of academic achievement, and a measure of verbal intelligence. Separate multiple regression analyses controlling for the effects of age, sex and verbal intelligence showed that tests of verbal memory and of direct recall significantly predicted reading and spelling achievement whereas tests of backward recall significantly predicted only pseudoword identification. Phonological awareness was also found to relate significantly to reading and spelling achievement even when working memory was partialled out. Thus, phonological awareness and measures of working memory predicted specific and significant amounts of variance in reading and spelling achievement. Further, none of these measures were specifically related to arithmetic achievement. The specific roles of phonological awareness and working memory in reading development are examined in the discussion.