The double-deficit hypothesis (Wolf, 1997; Wolf & Bowers, 1999, this issue) contends that deficits in phonological awareness and deficits in visual naming speed represent two independent causal impediments to reading acquisition for children with developmental reading disabilities (RD). One hundred and sixty-six children with severe RD from 7 to 13 years of age were classified into three deficit subgroups according to a double-deficit framework. A total of 140 children with RD, 84% of the sample, were classified; 54% demonstrated a double deficit (DD), 22% a phonological deficit only (PHON), and 24% a visual-naming speed deficit only (VNS). Diagnostic test profiles highlighted the joint contributions of the two core deficits in depressing written language acquisition. The children in the DD group were more globally impaired than those in the other subgroups, and the VNS group children were the highest achieving and most selectively impaired readers. Following 35 hours of word identification training, sizable gains and significant generalization of training effects were achieved by all subgroups. A metacognitive phonics program resulted in greater generalized effects across the domain of real English words, and a phonological training program produced superior outcomes within the phonological processing domain. The greatest non-word reading gains were achieved by children with only phonological deficits.

The efficacy of a combination of phonological and strategy-based remedial approaches for reading disability (RD) was compared with that of each approach separately. Eighty-five children with severe RD were randomly assigned to 70 intervention hours in 1 of 5 sequences: PHAB/DI (Phonological Analysis and Blending/Direct Instruction) -*• WIST (Word Identification Strategy Training), WIST -* PHAB/DI, PHAB/DI X 2, WIST X 2, or CSS -»• MATH (Classroom Survival Skills -* Math, a control treatment). Performance was assessed before, 3 times during, and after intervention. Four orthogonal contrasts based on a linear trend analysis model were evaluated. There were generalized treatment effects on standardized measures of word identification, passage comprehension, and nonword reading. A combination of PHAB/DI and WIST proved superior to either program alone on nonword reading, letter-sound and keyword knowledge, and 3 word identification measures. Generalization of nonword decoding to real word identification was achieved with a combination of effective remedial components.

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We propose that data-driven and conceptually-driven processing become integrated to form an episodic representation that mediates transfer to later reading and memory tasks. These experiments explored conditions that produce visual script specificity for episodic transfer. Earlier work suggested that script sensitivity is reliably found only when the script is unusual or difficult to read, leading some researchers to suggest that such transfer occurs only during unskilled reading. These studies, however, demonstrate reliable script sensitivity in an easy, semantically based reading task using normal scripts. Transfer to the second occurrence is harmed by a change in script when the subject's task is to silently read and answer short questions. No such script sensitivity is observed when the task is to read the questions aloud on each occurrence. The data are discussed in terms of automatic processing when reading is backgrounded in the service of a semantic task. This research was supported by grants to Larry L. Jacoby and Betty Ann Levy from the National Science and Engineering Research Council.We thank Jane Collins, Ann Hollingshead, and Sharyn Kreuger for their assistance in generating questions and collecting data. We also thank Roddy Roediger, Mike Masson, and Tom Carr for their helpful editorial comments.

One hundred and twenty-two severely reading disabled children were randomly assigned to one of two word identification training programs or a study skills control program. One program remediated deficient phonological analysis and blending skills and provided direct instruction of letter-sound mappings. The other program taught children how to acquire, use, and monitor four metacognitive decoding strategies. The effectiveness of the remedial programs was evaluated for children in grades 2/3, 4, and 5/6 to determine whether programs were differentially effective at different grade levels. Both training approaches were associated with significant improvement in word identification and word attack skills and sizeable transfer-of-training effects. The phonological program resulted in greater transfer across the phonological processing domain, whereas the strategy training program produced broader transfer for real words of both regular and irregular orthography. Children at each grade level made equivalent gains with remediation. These results suggest that the phonological deficits associated with reading disability are amenable to focused and intensive remediation and that this effort is well directed across the elementary school years. From grades 2 through 6, there is no evidence of a developmental window beyond which phonological deficits cannot be effectively remediated with intensive phonological training.