Despite earlier claims that language abilities are intact in individuals with Williams syndrome (WS), many studies have shown that language development is often delayed and atypical, that is, it develops in line with different cognitive abilities compared to typically developing populations. It is unclear, however, whether general cognitive…

Describing events may be challenging for any child, but children who use communication aids may face unique linguistic, pragmatic, and strategic challenges in conveying information with the communication means they have available. This study explores strategies used by young, aided communicators when describing the content of a video unknown to…

It is well established that adults converge on common referring expressions in dialogue, and that such lexical alignment is important for successful and rewarding communication. The authors show that children with an autistic spectrum disorder (ASD) and chronological- and verbal-age-matched typically developing (TD) children also show spontaneous…

Drawing tasks are frequently used to test competing theories of visuospatial skills in autism. Yet, methodological differences between studies have led to inconsistent findings. To distinguish between accounts based on local bias or global deficit, we present a simple task that has previously revealed dissociable local/global impairments in…

Background: The behavioural symptoms of autism spectrum disorder (ASD) are thought to reflect underlying cognitive deficits/differences. The findings in the literature are somewhat mixed regarding the cognitive features of ASD. This study attempted to address this issue by investigating a range of cognitive deficits and the prevalence of multiple…

The study investigated sequence learning from stochastic feedback in boys with Autistic Spectrum Disorder (ASD) and typically developed (TD) boys. We asked boys with ASD from Nigeria and the UK as well as age- and gender-matched controls (also males only) to deduce a sequence of four left and right button presses, LLRR, RRLL, LRLR, RLRL, LRRL and…

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…

This paper examines the extent to which self-assessed intelligence (SAI) may be a function of personality traits, gender, and "actual" intellectual ability (as measured through psychometric g) in a sample of 188 (119 female) UK university students. Participants completed three cognitive ability tests and the "Big Five"…

Recent results relating to the stability of scores on the Raven Progressive Matrices Test for different subgroups within and between the United Kingdom, United States, and other Western societies are summarized. Despite the continuous increase in scores over time, differences between socioeconomic and ethnic groups remain. (TJH)