Prevalence of ADHD and comorbid disorders among elementary school children screened for disruptive behavior

In the context of a school-based prevention of conduct disorder program, 7,231 first- through fourth-grade children were screened for cross-setting disruptive behavior. Frequencies of DSM-III-R psychiatric disorders and patterns of comorbidity were assessed. We also examined the association of psychiatric diagnosis with child and parent characteristics to determine differential risk based on diagnostic subgroups. Attention deficit hyperactivity disorder (ADHD) and oppositional-defiant disorder (ODD) were the most frequent diagnoses. Mood and anxiety disorders were infrequent as single diagnoses. Patterns of comorbidity demonstrated that both externalizing and internalizing disorders commonly cooccurred with ADHD. More severe degrees of psychopathology and psychosocial risk accrued to the subgroup of youths with ADHD plus a comorbid externalizing disorder.This study was supported by grant MN-46584 from the National Institute of Mental Health.     

Effects of language experience on the perception of American Sign Language

Perception of American Sign Language (ASL) handshape and place of articulation parameters was investigated in three groups of signers: deaf native signers, deaf non-native signers who acquired ASL between the ages of 10 and 18, and hearing non-native signers who acquired ASL as a second language between the ages of 10 and 26. Participants were asked to identify and discriminate dynamic synthetic signs on forced choice identification and similarity judgement tasks. No differences were found in identification performance, but there were effects of language experience on discrimination of the handshape stimuli. Participants were significantly less likely to discriminate handshape stimuli drawn from the region of the category prototype than stimuli that were peripheral to the category or that straddled a category boundary. This pattern was significant for both groups of deaf signers, but was more pronounced for the native signers. The hearing L2 signers exhibited a similar pattern of discrimination, but results did not reach significance. An effect of category structure on the discrimination of place of articulation stimuli was also found, but it did not interact with language background. We conclude that early experience with a signed language magnifies the influence of category prototypes on the perceptual processing of handshape primes, leading to differences in the distribution of attentional resources between native and non-native signers during language comprehension.     

Stigmatization,Culture and Counseling A Commentary on Growing Up and Living with NF1: a UK–Bangladeshi Case Study—by Santi Rozario

Rozario's presentation of the cultural manifestations of stigma experienced by a British Bangladeshi woman with Neurofibromatosis 1 (NF1) is unusual in its detail of one woman's account of others' interactions with her and the impact on her life. It raises issues that are readily recognisable to genetic counselors and are familiar themes in the literature on the psychology of appearance. We draw on the genetics literature and on a body of expertise in research on the psychology of visible difference to consider the role of the genetic counselor in response to expressions of stigmatization or poor self-esteem by those with a visible difference caused by a genetic condition.     

From ideology-critique to epochal criticism

It is a danger in the discursive turn in the human sciences that social criticism be abandoned in favour of continuing the conversation. However, an analysis of the reflexive paradox inherent in every communication act provides the basis for a non-foundationalist critique of the historical epoch.     

Book reviews

Wilson, B.A., & Moffat, N. (1992). Clinical management of memory problems (second edition). London. Chapman and Hall. Pp. 325. ISBN 0-412-32250-1. £15.95 (Pb.).

Campbell, R. (Ed.) (1992). Mental lives: Case studies in cognition. Oxford: Blackwell. Pp. 292. ISBN 0-631-17504-0. £18.95 (Pb.).

Chen, H.-C., & Tzeng, O.J.L. (Eds.) (1992). Language processing in Chinese. Amsterdam: North-Holland. ISBN 0-444-89139-0.     

Misspecification in Latent Change Score Models: Consequences for Parameter Estimation,Model Evaluation,and Predicting Change

Latent change score models (LCS) are conceptually powerful tools for analyzing longitudinal data (McArdle & Hamagami, 2001). However, applications of these models typically include constraints on key parameters over time. Although practically useful, strict invariance over time in these parameters is unlikely in real data. This study investigates the robustness of LCS when invariance over time is incorrectly imposed on key change-related parameters. Monte Carlo simulation methods were used to explore the impact of misspecification on parameter estimation, predicted trajectories of change, and model fit in the dual change score model, the foundational LCS. When constraints were incorrectly applied, several parameters, most notably the slope (i.e., constant change) factor mean and autoproportion coefficient, were severely and consistently biased, as were regression paths to the slope factor when external predictors of change were included. Standard fit indices indicated that the misspecified models fit well, partly because mean level trajectories over time were accurately captured. Loosening constraint improved the accuracy of parameter estimates, but estimates were more unstable, and models frequently failed to converge. Results suggest that potentially common sources of misspecification in LCS can produce distorted impressions of developmental processes, and that identifying and rectifying the situation is a challenge.