Hugh W. Catts

The Association of Reading Disability, Behavioral Disorders, and Language Impairment among Second‐grade Children

Children with language impairment (LI) have been shown to be at risk for reading disability (RD) and behavior disorder (BD). Previous research has not determined the specific pattern of these conditions associated with LI. This study sought to determine if the behavior disorder and reading problems represented different outcomes or if these conditions occurred together when found with LI. A group of 581 second-grade children, including 164 children with LI, were examined for spoken language, reading, and behavior disorder. The data for each of these areas were examined as dimensional traits and as clinical categorical traits. Reading and spoken language were found to be strongly correlated (r = .68); RD was found in 52 % of the children with LI and in only 9 % of the controls. Scores of parent ratings for BD were also significantly correlated with spoken language scores (r = .29). Clinical levels of BD were found in 29% of the children with LI and 19% of the controls. An examination of the co-occurrence of clinical levels of BD, RD, and LI showed BD in children with LI to be conditioned by the childs reading status. The data indicated that whereas RD was directly associated with BD, the association of LI with BD required the mediation of RD.

The Role of Speed of Processing, Rapid Naming, and Phonological Awareness in Reading Achievement

This study investigated the role of speed of processing, rapid naming, and phonological awareness in reading achievement. Measures of response time in motor, visual, lexical, grammatical, and phonological tasks were administered to 279 children in third grade. Measures of rapid object naming, phonological awareness, and reading achievement were given in second and fourth grades. Reading group comparisons indicated that poor readers were proportionally slower than good readers across response time measures and on the rapid object naming task. These results suggest that some poor readers have a general deficit in speed of processing and that their problems in rapid object naming are in part a reflection of this deficit. Hierarchical regression analyses further showed that when considered along with IQ and phonological awareness, speed of processing explained unique variance in reading achievement. This finding suggests that a speed of processing deficit may be an “extraphonological” factor in some reading disabilities.

Predicting, Explaining, and Preventing Children's Reading Difficulties

Several decades of research have made it clear that by the time children enter school they already vary widely in their reading-related knowledge and skills. How well do these differences predict differences in reading acquisition? What can they tell us about the causes of reading disabilities? How might these research findings be used to reduce the number of children who have difficulty learning to read? Answers to such questions are fundamental for designing early interventions for children at risk. In this paper, we summarize what has been learned so far, and discuss what directions need to be taken in future research so as to provide fuller answers.

Speech Production/Phonological Deficits in Reading-Disordered Children

Speech production/articulation was examined in reading-disordered and normal children. Subjects participated in three tasks involving the production of multisyllabic words and phonologically complex phrases. Results demonstrated that the reading-disordered children made significantly more speech production errors than normal children in each of the tasks. Furthermore, the reading-disordered childrens performance on the speech production tasks was correlated with their reading ability. It is concluded that the speech production difficulties of the reading-disordered children are a reflection of their various deficits in phonological processing.

Early Reading Achievement in Children With Expressive Phonological Disorders

In this study, 30 children with expressive phonological disorders and 27 children with normally developing phonological and language abilities were administered measures of expressive phonology, ph...

Floor Effects Associated With Universal Screening and Their Impact on the Early Identification of Reading Disabilities

Response to intervention (RTI) holds great promise for the early identification and prevention of reading disabilities. The success of RTI rests in part on the accuracy of universal screening tools used within this framework. Despite advancements, screening instruments designed to identify children at risk for reading disabilities continue to have limited predictive validity. In this study, the authors examined a common screening instrument for the presence of floor effects and investigated the impact that these effects have on the predictive validity of the instrument. Longitudinal data (kindergarten to third grade) from a large cohort of children were used. These data included childrens performance on five measures from the Dynamic Indicators of Basic Early Literacy Skills (DIBELS) and two reading achievement outcome measures. The results showed that DIBELS measures were characterized by floor effects in their initial administrations and that these effects reduced the predictive validity of the measures. The implications of these findings for early identification are discussed.

Early Identification of Dyslexia: Evidence from a Follow-Up Study of Speech-Language Impaired Children

A group of speech-language impaired children was administered a battery of standardized language tests and measures of phonological processing in kindergarten. Performance on these language measures was then compared to reading ability in first grade. Results indicated that children with semantic-syntactic language deficits had more difficulties in reading than did children with primarily speech articulation impairments. In addition, phonological processing measures were found to be good predictors of reading achievement. Results are discussed in terms of their implications for the early identification of developmental dyslexia.

Defining dyslexia as a developmental language disorder.

Despite recent developments in research and theory, investigators and practitioners continue to rely on rather traditional definitions of dyslexia. This paper discusses some of the problems with traditional definitions and reviews a rapidly growing body of research that suggests a more comprehensive definition. According to this definition, dyslexia is a developmental language disorder that involves a deficit(s) in phonological processing. This disorder manifests itself in various phonological difficulties as well as a specific reading disability.

Four-Year Follow-Up Study of Language Impaired Children.

Children identified as normal or as specifically language impaired (SLI) were given speech, language, and intelligence testing on a longitudinal basis. Fourteen normal and 29 SLI children between the ages of 4 1/2 and 8 years were tested at Time 1. They were retested three to four years later when they were 8 to 12 years old. The results indicated that both the normal and the SLI children continued to develop skills in receptive and expressive language and speech articulation across the 3- to 4-year period intervening between evaluations. Overall, however, the SLI children appeared to develop language skills at a slower than normal rate and 80% of them remained language impaired at Time 2. In addition, the majority of the SLI children manifested reading impairment at Time 2, while none of the normal children did so. The implications for the educational management of SLI children are discussed.

Prevalence and Nature of Late-Emerging Poor Readers.

Some children demonstrate adequate or better reading achievement in early school grades, but fall significantly behind their peers in later grades. These children are often referred to as late-emerging poor readers. In this study, we investigated the prevalence and heterogeneity of these poor readers. We also examined the early language and nonverbal cognitive abilities of late-emerging poor readers. Participants were 493 children who were a subsample from an epidemiological study of language impairments in school-age children. In kindergarten, children were administered a battery of language, early literacy, and nonverbal cognitive measures. Word reading and reading comprehension achievement was assessed in second, fourth, eighth, and tenth grades. Latent transition analysis was used to model changes in reading classification (good vs. poor reader) across grades. Population estimates revealed that 13.4% percent of children could be classified as late-emerging poor readers. These children could be divided into those with problems in comprehension alone (52%), word reading alone (36%), or both (12%). Further results indicated that late-emerging poor readers often had a history of language and/or nonverbal cognitive impairments in kindergarten. Subtypes of poor readers also differed significantly in their profiles of language, early literacy, and nonverbal cognitive abilities in kindergarten. Results are discussed in terms of causal factors and implications for early identification.