IQ & Intelligence Research
Peer-reviewed publications on cognitive ability, IQ measurement, and intelligence science.
Research Papers
Short Sleep Duration in Middle Childhood: Risk Factors and Consequences
STUDY OBJECTIVES: To measure sleep duration in 7-year-old children; identify the determinants of sleep duration; and assess the association between short sleep duration and obesity, cognitive funct...
Genome-wide association study of cognitive functions and educational attainment in UK Biobank (N=112 151)
People's differences in cognitive functions are partly heritable and are associated with important life outcomes. Previous genome-wide association (GWA) studies of cognitive functions have found ev...
Effect of a 24-Month Physical Activity Intervention vs Health Education on Cognitive Outcomes in Sedentary Older Adults
IMPORTANCE: Epidemiological evidence suggests that physical activity benefits cognition, but results from randomized trials are limited and mixed. OBJECTIVE: To determine whether a 24-month physica...
Human Variation in Overriding Attentional Capture
Attention can be directed either voluntarily based on the goals of the individual or involuntarily "captured" by salient stimuli in the immediate environment. Although involuntary capture is a crit...
Lifelong Bilingualism Maintains Neural Efficiency for Cognitive Control in Aging
Recent behavioral data have shown that lifelong bilingualism can maintain youthful cognitive control abilities in aging. Here, we provide the first direct evidence of a neural basis for the bilingu...
The Relation of Transient Hypothyroxinemia in Preterm Infants to Neurologic Development at Two Years of Age
BACKGROUND: Transient hypothyroxinemia, a common finding in premature infants, is not thought to have long-term sequelae or to require treatment. We investigated whether hypothyroxinemia in prematu...
The Effect of Chelation Therapy with Succimer on Neuropsychological Development in Children Exposed to Lead
BACKGROUND: Thousands of children, especially poor children living in deteriorated urban housing, are exposed to enough lead to produce cognitive impairment. It is not known whether treatment to re...
Neurodevelopmental disorders in children aged 2–9 years: Population-based burden estimates across five regions in India
BACKGROUND: Neurodevelopmental disorders (NDDs) compromise the development and attainment of full social and economic potential at individual, family, community, and country levels. Paucity of data...
Early Childhood Stimulation Benefits Adult Competence and Reduces Violent Behavior
OBJECTIVE: An estimated 178 million children younger than 5 years in developing countries experience linear growth retardation and are unlikely to attain their developmental potential. We aimed to ...
Independent examination of the Wechsler Adult Intelligence Scale—Fourth Edition (WAIS-IV): What does the WAIS-IV measure?
Published empirical evidence for the Wechsler Adult Intelligence Scale-Fourth Edition (WAIS-IV) does not address some essential questions pertaining to the applied practice of intellectual assessme...
Executive function and fluid intelligence after frontal lobe lesions
Many tests of specific 'executive functions' show deficits after frontal lobe lesions. These deficits appear on a background of reduced fluid intelligence, best measured with tests of novel problem...
Tone Language Speakers and Musicians Share Enhanced Perceptual and Cognitive Abilities for Musical Pitch: Evidence for Bidirectionality between the Domains of Language and Music
Psychophysiological evidence suggests that music and language are intimately coupled such that experience/training in one domain can influence processing required in the other domain. While the inf...
VIII. NIH TOOLBOX COGNITION BATTERY (CB): COMPOSITE SCORES OF CRYSTALLIZED, FLUID, AND OVERALL COGNITION
The NIH Toolbox Cognition Battery (CB) includes 7 tests covering 6 cognitive abilities. This chapter describes the psychometric characteristics in children ages 3-15 years of a total summary score ...
Higher Intelligence Is Associated with Less Task-Related Brain Network Reconfiguration
UNLABELLED: The human brain is able to exceed modern computers on multiple computational demands (e.g., language, planning) using a small fraction of the energy. The mystery of how the brain can be...
Emotional intelligence is a second-stratum factor of intelligence: Evidence from hierarchical and bifactor models.
This article examines the status of emotional intelligence (EI) within the structure of human cognitive abilities. To evaluate whether EI is a 2nd-stratum factor of intelligence, data were fit to a...
Schooling in adolescence raises IQ scores
Although some scholars maintain that education has little effect on intelligence quotient (IQ) scores, others claim that IQ scores are indeed malleable, primarily through intervention in early chil...
Multiple Bases of Human Intelligence Revealed by Cortical Thickness and Neural Activation
We hypothesized that individual differences in intelligence (Spearman's g) are supported by multiple brain regions, and in particular that fluid (gF) and crystallized (gC) components of intelligenc...
Copy Number Variations and Cognitive Phenotypes in Unselected Populations
IMPORTANCE: The association of copy number variations (CNVs), differing numbers of copies of genetic sequence at locations in the genome, with phenotypes such as intellectual disability has been al...
Development of a Causal Model of Processes Determining Job Performance
6. M. Morales, The function of general and spe cific abilities in the validity of the Air Force Officer Qualifying Test, unpublished master's thesis, St. Mary's University of Texas, San Antonio (19...
Extrinsic and Intrinsic Brain Network Connectivity Maintains Cognition across the Lifespan Despite Accelerated Decay of Regional Brain Activation
The maintenance of wellbeing across the lifespan depends on the preservation of cognitive function. We propose that successful cognitive aging is determined by interactions both within and between ...