Naming speed deficits in adults with reading disabilities: a test of the double-deficit hypothesis

The present study investigated the persistent nature of naming speed deficits within the context of the double-deficit hypothesis in a university sample of adults with reading disabilities (RD). Twenty-five university students with RD were compared to 28 typically achieving readers on measures of reading skill, phonological processing, and naming speed. The results indicated that both naming speed and phonological processing deficits characterized the RD group. In a regression analysis, neither naming speed nor phonological processing were important variables in explaining comprehension when reading rate was in the model. The results of the present study are mixed at best and are consistent with earlier conclusions that support for the double-deficit hypothesis of dyslexia remains limited.     

The importance of measuring growth in response to intervention models: Testing a core assumption

A core assumption of response to instruction or intervention (RTI) models is the importance of measuring growth in achievement over time in response to effective instruction or intervention. Many RTI models actively monitor growth for identifying individuals who need different levels of intervention. A large-scale (N=23,438), two-year longitudinal study of first grade children was carried out to compare the predictive validity of measures of achievement status, growth in achievement, and their combination for predicting future reading achievement. The results indicate that under typical conditions, measures of growth do not make a contribution to prediction that is independent of measures of achievement status. These results question the validity of a core assumption of RTI models.     

Rapid serial naming and reading ability: the role of lexical access

Rapid serial naming tasks are frequently used to explain variance in reading skill. However, the construct being measured by rapid naming is yet undetermined. The Phonological Processing theory suggests that rapid naming relates to reading because of similar demands of access to long-term stored phonological representations of visual stimuli. Some researchers have argued that isolated or discrete-trial naming is a more precise measure of lexical access than serial naming, thus it is likely that any shared variance between these two formats can be attributed to similar lexical access demands. The present study examined whether there remained any variance in reading ability that could be uniquely explained by the rapid naming task while controlling for isolated naming. Structural equation modeling was used to examine these relations within the context of the phonological processing model. Results indicated that serial naming uniquely predicted reading, and the relation was stronger with isolated naming controlled for, suggesting that isolated naming functioned as a suppressor variable in the relation of serial naming with reading.     

Re-victimization patterns in a national longitudinal sample of children and youth

OBJECTIVE: To understand to the degree to which a broad variety of victimizations, including child maltreatment, conventional crime, peer, and sexual victimizations, persist for children from 1 year to the next. DESIGN: A national sample of 1467 children aged 2-17 recruited through random digit dialing and assessed via telephone interviews (with caretakers and youth themselves) about a comprehensive range of victimization experiences in the previous year, and then re-assessed (72.3% of baseline sample) after a 1-year interval. RESULTS: The risk for re-victimization in Year 2 was high for children victimized in Year 1, with risk ratios ranging from 2.2 for physical assault to 6.9 for sexual victimization. Victimization of any one type left substantial vulnerability even for different types of subsequent re-victimization (e.g., property crime victimization was associated with higher risk of sexual victimization the next year). Children with four or more types of victimization in Year 1 ("poly-victims") were at particularly high risk of persisting poly-victimization. Persisting poly-victimization was more likely for children who scored high on anger/aggression and who had recent life adversities. Desistence from poly-victimization was associated with having more good friends. Onset of poly-victimization in Year 2, in contrast to persistence from Year 1, was associated with violent or maltreating families, family problems such as alcohol abuse, imprisonment, unemployment and family disruption. Having more older siblings acted as both a risk factor and a protective factor for different groups of youth. CONCLUSION: Children previously victimized in 1 year are at higher risk of continued victimization, and the poly-victims are at particular risk. These findings suggest the potential merit of identifying these high-risk children and making them priority targets for prevention efforts.     

Childhood adversity, poly-substance use, and disordered eating in adolescent Latinas: mediated and indirect paths in a community sample

OBJECTIVE: Although many studies have identified associations between childhood maltreatment and later substance use and disordered eating, few have examined causal or explanatory pathways, and whether victim characteristics predict the development of one versus the other of these outcomes remains uninvestigated. Furthermore, relatively little childhood maltreatment research has examined Latino samples. To address these gaps, this study examined among Latina adolescents the effects of sexual abuse, physical/emotional abuse, neglect, disconnection from family, and parental alcohol problems on poly-substance use and disordered eating, and whether five individual characteristics explain or differentiate these outcomes. METHOD: Data from a community sample of 361 Latina adolescents were analyzed using structural equation modeling. RESULTS: Physical/emotional abuse predicted poly-substance use and weight concerns, and these associations were mediated by impaired current attachment. Disconnection from family predicted bulimic behaviors, and this association was mediated by dysphoria. One indirect path also emerged: Disconnection from family predicted low social conformity, and low social conformity predicted poly-substance use. Childhood sexual abuse did not uniquely predict any adverse outcome or individual characteristic examined. CONCLUSIONS: Dysphoria and impaired current attachment appear to play important roles in the development of substance use and disordered eating in Latina adolescents when physical/emotional abuse or disconnection from family predicts these outcomes. Dysphoria and low social conformity may differentiate the development of bulimic behaviors and poly-substance use, respectively, when family disconnection predicts these outcomes.     

The double-deficit hypothesis: a comprehensive analysis of the evidence

The double-deficit hypothesis of developmental dyslexia proposes that deficits in phonological processing and naming speed represent independent sources of dysfunction in dyslexia. The present article is a review of the evidence for the double-deficit hypothesis, including a discussion of recent findings related to the hypothesis. Studies in this area have been characterized by variability in methodology--how dyslexia is defined and identified, and how dyslexia subtypes are classified. Such variability sets limitations on the extent to which conclusions may be drawn with respect to the double-deficit hypothesis. Furthermore, the literature is complicated by the persistent finding that measures of phonological processing and naming speed are significantly correlated, resulting in a statistical artifact that makes it difficult to disentangle the influence of naming speed from that of phonological processing. Longitudinal and intervention studies of the double-deficit hypothesis are needed to accumulate evidence that investigates a naming speed deficit that is independent of a phonological deficit for readers with dyslexia. The existing evidence does not support a persistent core deficit in naming speed for readers with dyslexia.     

Integrated application of some compatible biocontrol agents along with mustard oil seed cake and furadan on Meloidogyne incognita infecting tomato plants

INTRODUCTION Tomato (Lycopersicon esculentum, Mill.), an important vegetable crop is heavily attacked by root knot nematode, Meloidogyne spp. For the manage-ment of root knot nematodes although chemical nematicides were used till 1982, due to their high cost, toxic effect on beneficial soil borne microorganism and carcinogenic effect on human beings alternative approaches are practiced mainly through eco-friendly means like biological control agents, organic amendments, etc. (Singh and …