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…

Objectives: The aim of the study is to help identify the nature of impaired executive functioning (EF) in children with autism spectrum disorder (ASD). It is also argued that participant sampling by age alone should inform experimental research on EF, as selection through IQ matching may weaken any experimental effects. Methods: Sixteen children…

An individual's neurodevelopmental and cognitive sequelae to negative early experiences may, in part, be explained by genetic susceptibility. We examined whether extreme differences in the early caregiving environment, defined as exposure to severe psychosocial deprivation associated with institutional care compared to normative rearing,…

Normative comparisons are an integral component of neuropsychological test interpretation and provide the basis for an inference of abnormal function and impairment. In order to remedy a deficit of normative standards for a large number of neuropsychology tests, Mitrushina, Boone, Razani, and D'Elia (2005) used the meta-analysis of studies that…

In this rejoinder, we criticize Lynn and Meisenberg's (this issue) methods to estimate the average IQ (in terms of British norms after correction of the Flynn Effect) of the Black population of sub-Saharan Africa. We argue that their review of the literature is unsystematic, as it involves the inconsistent use of rules to determine the…

This study aimed to find out the brain hemisphericity and mathematics achievement of high school students. The respondents of the study were the 168 first year high school students of Colegio de San Jose, during school year 2010-2011 who were chosen through stratified random sampling. The descriptive and interview methods of research were used in…

In his comment on our literature review of data on the performance of sub-Saharan Africans on Raven's Progressive Matrices, Lynn (this issue) criticized our selection of samples of primary and secondary school students. On the basis of the samples he deemed representative, Lynn concluded that the average IQ of sub-Saharan Africans stands at 67…

Background: In recent years, academic debate has (re)focused on the extent of the co-occurrence of intellectual disability (ID) and criminality, although findings from prevalence studies examining this link have been inconsistent. In April 2004, a process for transferring responsibility for commissioning healthcare services in UK prisons to…

This study investigated the possibility that apparent sex differences in IQ are at least partly created by the degree of sample restriction from the baseline population. We used a nationally representative sample, the 1970 British Cohort Study. Sample sizes varied from 6518 to 11,389 between data-collection sweeps. Principal components analysis of…

The purposes of this study were to determine which of the tests, PPVT, SIT, or Lorge-Thorndike (LT), may be the most useful to the classroom teacher in predicting reading achievement, for use in reading expectancy formulas, and for analyzing I.Q. scores obtained on different tests. (Author/RK)

Data from Terman's "Genetic Studies of Genius" (1925-1959) relating to sample size, mean IQ, and variance of IQ scores were analyzed in terms of their conformation to the theoretically projected statistics derived from a consideration of the normal curve. (Author/RC)

The present effort had two major thrusts: 1.) to study the behavioral consequences of communicating group test scores to teachers and 2.) to investigate the behavioral outcomes of antecedent teacher attitudes toward testing. (Author)

The broad hypothesis that children whose histories imply the possible presence of an intellect-reducing condition will score lower on an IQ test than children whose histories do not imply such conditions was tested in a study designed to illustrate the distinction between average and normal IQ. Health and behavior histories of a sample of second…

The purpose of this investigation is to provide further data concerning the variables, age, intelligence and sex, that may affect moral judgment. (Author/RK)

A number of studies in the United States have found that Jews obtain higher average IQs than white gentiles. This paper examines whether this is also the case in Britain. Three early studies are summarized that found that Jews in Britain have mean IQs in the range of 110-113. New data are presented for two nationally representative samples of 7-16…