Maryanne Wolf

Naming-Speed Processes, Timing, and Reading A Conceptual Review

This article integrates the findings in the special issue with a comprehensive review of the evidence for seven central questions about the role of naming-speed deficits in developmental reading disabilities. Cross-sectional, longitudinal, and cross-linguistic research on naming-speed processes, timing processes, and reading is presented. An evolving model of visual naming illustrates areas of difference and areas of overlap between naming speed and phonology in their underlying requirements. Work in the cognitive neurosciences is used to explore two nonexclusive hypotheses about the putative links between naming speed and reading processes and about the sources of disruption that may cause subtypes of reading disabilities predicted by the double-deficit hypothesis. Finally, the implications of the work in this special issue for diagnosis and intervention are elaborated.

Theoretical links among naming speed, precise timing mechanisms and orthographic skill in dyslexia

In this paper, we review several lines of convergent research to discuss the relationship between developmental dyslexia and slow symbol naming speed. We describe the interactive development of orthographic and phonological codes, and we discuss the methodological problems that may have led to underestimating the importance of individual differences in orthographic processing in our account of reading disabilities. Symbol naming speed is typically subsumed under phonological processing, yet it contributes variance to reading, especially to reading fluency, independently of phonological awareness. We speculate that naming speed may reflect precise timing mechanisms necessary to the development of orthographic codes and to their integration with phonological codes. We argue that an understanding of this precise timing dimension is necessary to incorporate in our models of phonological, orthographic, and semantic processes in reading acquisition and reading failure.

Reading Fluency and Its Intervention

This 3-part article represents an effort to confront 3 large lacunae in the research on reading fluency: definition, component structure, and theory-based intervention. The 1st section describes several historical approaches to fluency and the components of fluent reading that are implicit in these approaches. We then present our own developmental- and component-based definition of reading fluency. In the 2nd section we discuss how different types of current fluency interventions correspond to particular components in fluencys structure and to particular phases of its development. The last section presents an overview of an experimental fluency program that attempts to address multiple components in the development of fluent reading. Finally, we argue that increased exploration of the issues surrounding fluency and comprehension will contribute to our understanding of both reading development and dyslexia subtypes.

Naming Speed and Reading: The Contribution of the Cognitive Neurosciences.

THIS TWO-PART ESSAY discusses how research in the developmental cognitive neurosciences can contribute to an understanding of the complex relations between various aspects of naming and reading processes. The first section reviews findings from both neuropsychological and reading research on letter-naming and general naming speed, and analyzes the methodological differences between discrete-trial and continuous naming formats. The findings taken together suggest that the relations between subprocesses change both with development and as the cognitive requirements for naming and reading tasks become more differentiated. Findings from a number of studies also suggest the existence of a naming-rate deficit that differentiates dyslexic from average and garden-variety poor readers; this deficit appears to persist well into middle childhood. The second section speculates more broadly about whether the relations between naming and reading deficits are causal or associative, and also about associations between deficits in naming speed and deficits in motoric speed. These associations could be explained by the existence of a connector variable common to some processes in both language and motoric domains, such as a hypothesized precise timing mechanism that may inhibit the ability of some dyslexic readers to achieve rapid processing.

Rapid Automatized Naming (RAN) and Reading Fluency: Implications for Understanding and Treatment of Reading Disabilities

Fluent reading depends on a complex set of cognitive processes that must work together in perfect concert. Rapid automatized naming (RAN) tasks provide insight into this system, acting as a microcosm of the processes involved in reading. In this review, we examine both RAN and reading fluency and how each has shaped our understanding of reading disabilities. We explore the research that led to our current understanding of the relationships between RAN and reading and what makes RAN unique as a cognitive measure. We explore how the automaticity that supports RAN affects reading across development, reading abilities, and languages, and the biological bases of these processes. Finally, we bring these converging areas of knowledge together by examining what the collective studies of RAN and reading fluency contribute to our goals of creating optimal assessments and interventions that help every child become a fluent, comprehending reader.

The second deficit: An investigation of the independence of phonological and naming-speed deficits in developmental dyslexia

An increasing body of dyslexia researchdemonstrates, in addition to phonologicaldeficits, a second core deficit in theprocesses underlying naming speed. Thehypothesized independence of phonologicalawareness and naming-speed variables inpredicting variance in three aspects of readingperformance was studied in a group of 144severely-impaired readers in Grades 2 and 3. Stepwise regression analyses were conducted onthese variables, controlling for the effects ofSES, age, and IQ. Results indicated thatphonological measures contribute more of thevariance to those aspects of reading skill thatinvolve decoding or word attack skills;naming-speed measures contribute more to skillsinvolved in word identification. Subtypeclassification findings were equally supportiveof the independence of the two deficits: 19%of the sample had single phonological deficits;15% had single naming-speed deficits; 60% had double-deficits; and 6% could not be classified. The implications of these findingsfor diagnosis and intervention are discussed.

Rapid alternating stimulus naming in the developmental dyslexias

A rapid, alternating stimulus (RAS) naming measure was designed to study the developing ability in dyslexic readers to direct attention to contextual patterns while performing a rapid serial naming task. The results from a 3-year longitudinal investigation of 98 children indicate three trends. RAS performances differentiate both average from impaired readers and dyslexic subgroups from each other. The largest, most impaired subgroup can not complete the RAS tasks in kindergarten; the smaller subgroups have little name access speed deficits. Early RAS performances are highly predictive of later reading, particularly at the single-word reading level. Implications for understanding the development of automaticity and the relationship between retrieval speed and reading are discussed.

Measuring Socioeconomic Status Reliability and Preliminary Validity for Different Approaches

This study investigated issues related to commonly used socioeconomic status (SES) measures in 140 participants from three cities (Atlanta, Boston, and Toronto) in two countries (United States and Canada). Measures of SES were two from the United States (four-factor Hollingshead scale, Nakao and Treas scale) and one from Canada (Blishen, Carroll, and Moore scale). Reliability was examined both within (interrater agreement) and across (intermeasure agreement) measures. Interrater reliability and classification agreement was high for the total sample (range r = .86 to .91), as were intermeasure correlations and classification agreement (range r = .81 to .88). The weakest agreement across measures was found when families had one wage earner who was female. Validity data for these SES measures with academic and intellectual measures also were obtained. Some support for a simplified approach to measuring SES was found. Implications of these findings for the use of SES in social and behavioral science research are discussed.

Early naming deficits, developmental dyslexia, and a specific deficit hypothesis

The present research represents the final 2 years of a 5-year longitudinal investigation of (a) confrontation-based, word-retrieval deficits in dyslexic children; (b) the role of vocabulary development in these deficits; (c) the relationship between confrontation naming performance and three carefully defined aspects of reading performance in the general population and in eight dyslexic case studies; and (d) the possible specificity of word-retrieval deficits in dyslexia. Results indicate enduring problems in word-retrieval processes for dyslexic children across the primary grades and into middle childhood. Second, these deficits cannot be explained by simple vocabulary deficits. Third, these results in conjunction with our earlier data consolidate a pattern of differential relationships between specific reading and confrontation naming skills that are based on development and on the level of processes involved. Trends within case studies suggest the more pronounced the retrieval deficit, the more global the reading impairment. And fourth, there appear to be some specific differences in the basis of word-retrieval problems between dyslexic and garden-variety or lower achieving readers. Results are discussed within a speculative framework that implicates problems in timing as a possible predetermining condition in the dyslexias.

Naming-Speed Processes and Developmental Reading Disabilities: An Introduction to the Special Issue on the Double-Deficit Hypothesis

here has been general consensus t in dyslexia research that phonoJL logical processing deficits underlie dyslexic readers’ failure to acquire adequate word recognition skills (Blachman, 1997; Bradley & Bryant, 1983; Brady & Shankweiler, 1991; Bruck & Treiman, 1990; Catts, 1996; Shankweiler & Liberman, 1972; Foorman, Francis, Shaywitz, Shaywitz, & Fletcher, in press; Kamhi & Catts, 1989; Lyon, 1995; Stanovich, 1986,1988,1992; Torgesen, Wagner, Rashotte, Burgess, & Hecht, 1997; Tunmer, 1995; Vellutino & Scanlon, 1987; Wagner & Torgesen, 1987). The assumption of