Dyslexia is a term widely used to describe reading characterised by problems with the fluent and accurate letter or word recognition. Nevertheless, there is no consensus about the definition, origin, and diagnosis of dyslexia and the term is often used very differently by researchers and practitioners. In many cases, research findings are employed…

In this commentary of "Evaluating the Gifted Program of an Urban School District Using a Modified Regression Discontinuity Design" by Davis, Engberg, Epple, Sieg, and Zimmer, we examine the background of the study, critique the methods used, and discuss the results and implications. The study used a fuzzy regression discontinuity design…

Weiss, Keith, Zhu, and Chen (2013a) and Weiss, Keith, Zhu, and Chen (2013b), this issue, report examinations of the factor structure of the Wechsler Adult Intelligence Scale-Fourth Edition (WAIS-IV) and Wechsler Intelligence Scale for Children-Fourth Edition (WISC-IV), respectively; comparing Wechsler Hierarchical Model (W-HM) and…

Data collection can be the most time- and cost-intensive part of developmental research. This article describes some long-proposed but little-used research designs that have the potential to maximize data quality (reliability and validity) while minimizing research cost. In "planned missing data designs", missing data are used…

Background: Clinical trials of medications to alleviate the cognitive and behavioural symptoms of individuals with fragile X syndrome (FXS) are now underway. However, there are few reliable, valid and/or sensitive outcome measures available that can be directly administered to individuals with FXS. The majority of assessments employed in clinical…

Objective: Additional treatments with persisting benefit are needed for ADHD. Because ADHD often shows excessive theta electroencephalogram (EEG) power, low beta, and excessive theta-beta ratio (TBR), a promising treatment is neurofeedback (NF) downtraining TBR. Although several nonblind randomized clinical trials (RCTs) show a medium-large…

A total of 19 graduate students enrolled in a graduate course conducted 6 consecutive administrations of the Wechsler Intelligence Scale for Children, 4th edition (WISC-IV, Canadian version). Test protocols were examined to obtain data describing the frequency of examiner errors, including administration and scoring errors. Results identified 511…

This chapter covers the methods and measures used in the ERA study, with a special focus on age 15 outcomes. First, the authors outline the sample participation rate for the 15-year follow-up--the percentages in all cases referring to the numbers at the time of initial sample contact. They then describe the measures used in this monograph,…

Article sought to determine the usefulness of tests, such as the WRAT and the WISC, as screening tools to detect learning disabilities and to identify the variables that would determine whether patients screened for learning disorders could be grouped clinically according to the prominence of learning or emotional symptoms. (Author/RK)

The author discusses conclusions presented in two artcles by H. Vance et al. titled "Determining WISC-R (Wechsler Intelligence Scale for Children-Revised) Profiles for Reading Disabled Children" and "Developing Remedial Hypotheses from Ability Profiles." The validity of five distinct WISC-R profiles for reading disabled…

The authors reply to M. Miller's concerns regarding their work on Wechsler Intelligence Scale for Children-Revised (WISC-R) profiles for reading disabled children. Among the criticisms addressed are those dealing with subject sampling, Ss not fitting into the five WISC-R profiles, and factor analysis procedures used. (SBH)

The author responds to rebuttals by F. Wallbrown et al. regarding criticisms of their research on Wechsler Intelligence Scale for Children-Revised (WISC-R) profiles of reading disabled children. (SBH)

The purpose of this cross-sectional study was to compare and contrast performances on the WPPSI and the WISC to determine the concurrent validity of the two instruments at three age levels among disadvantaged black children. (Author)

The original authors respond to a critique of their meta-analysis of 94 studies which had failed to support the presence of distinctive Wechsler Intelligence Scale for Children profiles for learning disabled children. The critique contended such a pattern does exist. (Author/DB)

As part of a continuing dialog concerning the validity of a meta-analysis of 94 studies suggesting that there is a lack of any distinctive pattern in the Wechsler Intelligence Scale for Children (Revised) profiles for learning disabled children, this article maintains the view that such differences do exist. (DB)