Rebecca H. Felton

Neuropsychological profile of adult dyslexics

One hundred and fifteen adults with well-documented childhood reading status underwent a series of neuropsychological tests including tests of memory, attention, phonological processing, and visual perceptual skills in an attempt to define the neuropsychological profile of dyslexia in adulthood. Compared to a normal nonreading disabled sample, subjects with a history of reading disability performed consistently poorer on most neuropsychological tests. However, after covarying for intelligence and socioeconomic status, only tests of rapid naming, phonological awareness, and nonword reading were significant discriminating measures. The hypothesis that deficits in phonological processing comprise the core cognitive deficits in adults with a history of reading disability was supported. Independent of current adult reading ability, measures of nonword reading, phonological awareness, and rapid naming serve as indicators of a childhood history of reading disability.

Selective Predictive Value of Rapid Automatized Naming in Poor Readers

This study considers the differential predictive value of rapid naming tests for various aspects of later reading, where the differential is between nondisabled and poor readers. Two large-N longitudinal samples of students who have been evaluated from third through eighth grades are studied: (a) a randomly accessed, normally distributed group including students with varying degrees of reading ability (N = 154), and (b) a group of poor readers whose single-word reading in third grade is at or below the population 10th percentile (N = 64). Outcomes in fifth and eighth grade were measured in both groups. Single-word reading in both grades was strongly predicted from third-grade rapid naming only within the poor readers, even when IQ, socioeconomc status, and third-grade single-word reading were statistically controlled. Although rapid naming had predictive value within the large, normally distributed group, its predictive power was entirely absent in the average-reading nondisabled students who were between the 10th and 90th percentiles (n = 122). The fact that rapid naming has predictive power only for poor readers but not for average readers is interpreted as suggesting that impaired readers are qualitatively different from the normal-reading population and are not simply the “tail” of a normal distribution of reading ability. It also seems that it is the automaticity of retrieval, not the knowledge of names itself (as in confrontational naming tasks), that gives the predictive power in rapid naming. These data are considered in light of the one-and two-factor theories of the underlying processes involved in reading disability or dyslexia.

Separate verbal memory and naming deficits in attention deficit disorder and reading disability

In this study, verbal memory and naming abilities were investigated in reading disabled (RD) and control children who were characterized according to the presence or absence of attention deficit disorder (ADD). Results indicate that deficits in learning and memory for recently acquired information occur as a function of ADD rather than RD while deficits in naming are specific to RD rather than ADD. We conclude that ADD is a major source of additional and separate cognitive morbidity in RD children.

Phonological processes as predictors of specific reading skills in children at risk for reading failure

Children at risk for reading disability were evaluated as kindergartners and again as first graders to determine (1) intercorrelations among phonological processing tasks and (2) the relationship of such tasks to word identification and word attack. With IQ controlled, there were no intercorrelations among measures of phonological awareness, phonetic recoding in working memory, and phonological recoding in lexical access. Thus, these results failed to substantiate the concept of a general phonological processing ability. Partial correlations controlling for IQ revealed no relationship between reading and phonological awareness or phonetic recoding in working memory. In contrast, lexical access measures were significantly, albeit moderately, correlated with word identification but not word attack. Word attack and word identification were predicted by different combinations of variables. These results suggest that lexical access ability is an important factor in reading acquisition and that different combinations of phonological processes may be related to different aspects of reading.

Effects of instruction on beginning reading skills in children at risk for reading disability

Children identified in kindergarten as being at risk for reading disability were taught in grades one and two using one of two methods of reading instruction, a structured phonics code-emphasis approach or an approach emphasizing use of context. At the end of first and second grade, children were tested on measures of achievement in word identification, word attack, passage comprehension and spelling. Those in the Code group earned uniformly higher scores on all achievement measures at the end of first and second grades. At the end of first grade, statistically significant differences between groups were found on nonword reading and spelling of phonetically regular words. At the end of second grade, significant differences were found in reading of polysyllabic real words and decoding of monosyllabic and polysyllabic nonsense words. It was concluded that reading instruction does have an important impact on acquisition of early reading skills, and that structured, systematic phonics instruction results in more favorable outcome than does a context emphasis approach.

Effects of Instruction on the Decoding Skills of Children with Phonological-Processing Problems

This article reviews research carried out by the Bowman Gray Learning Disabilities Project concerning the role of instruction in the acquisition of word-identification (decoding) skills in children at risk for reading disabilities. A group of 81 kindergarten children were identified as at risk for reading disabilities based on teacher assessment and weak or deficient phonological-processing skills. These children were classified as to type of phonological-processing problem (i.e., phonological awareness or retrieval of phonological information) and were randomly assigned to either a Code or Context instructional method for first and second grades. Children who received Code instruction scored higher than children receiving context instruction on a variety of reading and spelling measures at the end of first and second grades. The elements of the Code instructional program considered critical to the success of a beginning reading instruction program for children with phonological processing problems are discussed.

A Reading Level Match Study of Nonword Reading Skills in Poor Readers with Varying IQ

This study evaluated the hypothesis that poor readers are characterized by poor nonword reading skills, but that a specific deficit, as opposed to a developmental lag, in nonword reading will be found only in subjects whose reading is discrepant from intellectual ability. To test this hypothesis, we measured nonword reading skills in 93 (64 male, 29 female) third-grade poor readers and 54 (37 male, 17 female) fifth-grade poor readers (with and without reading/IQ discrepancies) who were matched to 147 (81 male, 66 female) nondisabled first graders on word identification skills. Results showed third- and fifth-grade poor readers to be significantly more impaired than word-identification level match first graders on all measures on nonword reading. These findings were not related to the verbal IQ level within the poor reader groups and, thus, provide strong evidence for a deficit in nonword reading skills that is not explained by verbal intelligence.

Separate Linguistic and Attentional Factors in the Development of Reading.

This article reports research carried out by the Bowman Gray Learning Disabilities Project concerning the relationship between attentional and linguistic factors in the development of reading. Three samples (N = 204 randomly selected first graders, N = 60 poor readers accessed in the third grade, and N = 105 adults who were evaluated for reading problems in childhood) were tested over a five-year period to address issues of prediction of reading impairment by linguistic and attentional variables as well as the relationship between these two factors. Results indicate that attention deficit disorder (ADD) has no impact on the development of word identification skills but does affect long-term educational outcome. Phonological decoding and rapid naming skills are critical factors in the development of basic reading skills.

Long-term follow-up of a childhood amnesic syndrome

In attempting to explain observed dissociations between impaired and preserved memory functioning in amnesia, various dichotomous memory systems (e.g., procedural versus declarative, episodic versus semantic, working versus reference memory) have often been employed. In such cases, the assumption has been that memory subserved by one system is preserved, while that of the other system is impaired. Cohen and Squire have suggested that in amnesia, declarative memory is impaired, although procedural memory is preserved. Long-term follow-up of a densely amnesic patient refutes this view by demonstrating significant anterograde learning of school subjects including reading, vocabulary, spelling, and arithmetic, all of which include some component of declarative memory. It appears that the procedural/declarative dichotomy is not adequate to explain preserved memory in amnesia.

Impact of Instruction on Word Identification Skills in Children with Phonological Processing Problems

Children were identified in kindergarten as at risk for reading disability based on poor performance on measures of phonological proresring (phonological analysis and phonological recoding). At-risk students were taught in grades one and two using either a Code approach (structured phonics) or a Context approach to reading instruction. A third group of at-risk students was designated as a passive control group. At the end of grades one and two, children in the Code group earned higher scores on word identification and significantly higher scores on nonword reading than children in either the Context or Control groups. Classification of children as having general phonological analysis or recoding problems indicated that problems in phonological analysis were the most common. A smaller group of subjects had problems only in phonological recoding. In addition, a small group of children had problems in both analysis and recoding. Although the majority of children in each of the treatment groups showed general deficits in phonological analysis, only phonological receding measures were significantly correlated with reading outcome. It was concluded that direct instruction in the alphabetic code can have a positive impact on the development of nonword reading skills in children with differing types and degrees of phonological processing deficits.