IQ & Intelligence Research
Peer-reviewed publications on cognitive ability, IQ measurement, and intelligence science.
Research Papers
How Does Your Cortex Grow?
Understanding human cortical maturation is a central goal for developmental neuroscience. Significant advances toward this goal have come from two recent strands of in vivo structural magnetic reso...
Substantial Genetic Influence on Cognitive Abilities in Twins 80 or More Years Old
General and specific cognitive abilities were studied in intact Swedish same-sex twin pairs 80 or more years old for whom neither twin had major cognitive, sensory, or motor impairment. Resemblance...
Effects of Hypothermia for Perinatal Asphyxia on Childhood Outcomes
BACKGROUND: In the Total Body Hypothermia for Neonatal Encephalopathy Trial (TOBY), newborns with asphyxial encephalopathy who received hypothermic therapy had improved neurologic outcomes at 18 mo...
The cognitive ability of an incident cohort of Parkinson’s patients in the UK. The CamPaIGN study
We have used multiple sources to identify a population-representative cohort of newly diagnosed patients with parkinsonism and Parkinson's disease in the UK over a 2-year period. All patients have ...
Quantifying and exploring camouflaging in men and women with autism
Autobiographical descriptions and clinician observations suggest that some individuals with autism, particularly females, 'camouflage' their social communication difficulties, which may require con...
Prenatal Exposure to Organophosphate Pesticides and IQ in 7-Year-Old Children
CONTEXT: Organophosphate (OP) pesticides are neurotoxic at high doses. Few studies have examined whether chronic exposure at lower levels could adversely affect children's cognitive development. OB...
Global Connectivity of Prefrontal Cortex Predicts Cognitive Control and Intelligence
Control of thought and behavior is fundamental to human intelligence. Evidence suggests a frontoparietal brain network implements such cognitive control across diverse contexts. We identify a mecha...
The health gap: the challenge of an unequal world
In Aldous Huxley’s dystopia, Brave New World, there were fi ve castes. The Alphas and Betas were allowed to develop normally. The Gammas, Deltas, and Epsilons were treated with chemicals to arres...
Brain Anatomical Network and Intelligence
Intuitively, higher intelligence might be assumed to correspond to more efficient information transfer in the brain, but no direct evidence has been reported from the perspective of brain networks....
Why does working memory capacity predict variation in reading comprehension? On the influence of mind wandering and executive attention.
Some people are better readers than others, and this variation in comprehension ability is predicted by measures of working memory capacity (WMC). The primary goal of this study was to investigate ...
Psychiatric Co-occurring Symptoms and Disorders in Young, Middle-Aged, and Older Adults with Autism Spectrum Disorder
Although psychiatric problems are less prevalent in old age within the general population, it is largely unknown whether this extends to individuals with autism spectrum disorders (ASD). We examine...
Comparative longitudinal structural analyses of the growth and decline of multiple intellectual abilities over the life span.
Latent growth curve techniques and longitudinal data are used to examine predictions from the theory of fluid and crystallized intelligence (Gf-Gc theory; J. L. Horn & R. B. Cattell, 1966, 1967). T...
An Overview of Intellectual Disability: Definition, Diagnosis, Classification, and Systems of Supports (12th ed.)
The American Association on Intellectual and Developmental Disabilities (AAIDD) has published terminology and classification manuals since 1921. Their goals over the last 100 years have been consis...
Artificial General Intelligence: Concept, State of the Art, and Future Prospects
Abstract In recent years broad community of researchers has emerged, focusing on the original ambitious goals of the AI field - the creation and study of software or hardware systems with general i...
Longitudinal cohort study of childhood IQ and survival up to age 76
Abstract Objectives: To test the association between childhood IQ and mortality over the normal human lifespan. Design: Longitudinal cohort study. Setting: Aberdeen. Subjects: All 2792 children in ...
Prevalence and Early Identification of Autism Spectrum Disorder Among Children Aged 4 and 8 Years — Autism and Developmental Disabilities Monitoring Network, 16 Sites, United States, 2022
Problem/Condition: Autism spectrum disorder (ASD). Period Covered: 2022. Description of System: The Autism and Developmental Disabilities Monitoring Network is an active surveillance program that e...
What is working memory capacity, and how can we measure it?
A latent variable study examined whether different classes of working-memory tasks measure the same general construct of working-memory capacity (WMC). Data from 270 subjects were used to examine t...
Fetal testosterone and autistic traits
Studies of amniotic testosterone in humans suggest that fetal testosterone (fT) is related to specific (but not all) sexually dimorphic aspects of cognition and behaviour. It has also been suggeste...
Birth weight and cognitive function in the British 1946 birth cohort: longitudinal population based study
OBJECTIVE: To examine the association between birth weight and cognitive function in the normal population. DESIGN: A longitudinal, population based, birth cohort study. PARTICIPANTS: 3900 males an...
Maternal Fish Intake during Pregnancy, Blood Mercury Levels, and Child Cognition at Age 3 Years in a US Cohort
The balance of contaminant risk and nutritional benefit from maternal prenatal fish consumption for child cognitive development is not known. Using data from a prospective cohort study of 341 mothe...