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PubMed2000

Cognition. The holey grail of general intelligence.

Exactly what is human intelligence and how should we measure it? Such questions have plagued us since the time of Plato, who first proposed that the seat of intelligence is in the brain. In a Perspective, Sternberg discusses new findings (Duncan et al.) that purport to show that the seat of general intelligence is located in the brain's frontal lobes. But, as Sternberg points out, measures of intelligence are only as good as the tests you use and the conclusions that you draw from them.

Brain Mapping↗

PubMed2005

Toward an integrated profile of emotional intelligence: introducing a brief measure.

Over the last decade, an increasing number of research studies have focused on the construct of Emotional Intelligence (EI), which may be broadly defined as the capacity to perceive and regulate emotions in oneself as well as those of others. Researchers have generally adopted an organizational or management focus to the study of EI, however studies which adopt a more integrated perspective by combining psychological with biological measures, may help in further elucidating this relatively abstract construct. The first objective of this paper was to report on the psychometric properties of a brief, self-report measure of EI (Brain Resource Inventory for Emotional intelligence Factors or BRIEF), comprising internal emotional capacity (IEC), external emotional capacity (EEC) and self concept (SELF). Second, we further explored the validity of the measure by assessing the relationships between the BRIEF and variables considered relevant to the understanding of EI (including gender, age, personality, cognitive intelligence and resting state electroencephalography, EEG). The BRIEF possessed sound psychometric properties (internal consistency, r=0.68-0.81; test-retest reliability, r=0.92; construct validity with the Self Report Emotional Intelligence Test, r=0.70). As hypothesized, females were found to score higher than males on EI. EI was associated more with personality than with cognitive ability, and EEG was found to explain a significant portion of the variance in EI scores. The finding that low EI is related to underarousal of the left-frontal cortex (increased theta EEG) is consistent with research on patients with depression, as well as attention deficit hyperactivity disorder. Although EI did not display age-related increases, this might relate to the exclusion of adolescents from our sample. In conclusion, examination of the way in which EI measures relate to a complementary range of psychological and biological measures may help to further elucidate this construct.

Adult↗

PubMed2001

Confirmatory factor analysis of the Kaufman Adolescent and Adult Intelligence Test with young adolescents.

This study examined the factor structure of the Kaufman Adolescent and Adult Intelligence Test (KAIT) in 375 11- to 14-year-olds (normative sample) and 60 sixth- and eighth-graders (cross-validation sample). Previous exploratory and confirmatory factor analyses of the KAIT have included optional subtests, which are often not administered in practice, and have not tested oblique versus orthogonal two-factor models. In this study, three factor models were tested via confirmatory factor analysis for the six core subtests of the KAIT: a one-factor general intelligence (g) model, an orthogonal fluid intelligence (Gf)-crystallized intelligence (Gc) model, and an oblique Gf-Gc model. The orthogonal Gf-Gc model fit poorly in both samples. The g model fit only the cross-validation sample. The oblique Gf-Gc model fit both samples and fit significantly better than the g model in both samples. Additional tests of factor structure, path coefficients, and covariance between Gf and Gc indicated that the data from both samples fit even the most restrictive oblique Gf-Gc model tested. KAIT users can be confident that the Fluid and Crystallized IQs from the KAIT are adequate representations of a robust and interpretable factor structure when only the core subtests are administered to young adolescents.

Adolescent↗

PubMed1999

Primary megalencephaly at birth and low intelligence level.

OBJECTIVES: To evaluate the association between primary megalencephaly (PMG) at birth and psychosensory conditions and to determine mother-child similarity for PMG at birth. BACKGROUND: PMG is defined as a head circumference (HC) above the 98th percentile that most likely is due to brain enlargement and is not secondary to disease. Previously, PMG in children was reported to be associated with learning disabilities. Contradictory results regarding an association between PMG and intelligence in children exist. Many believe PMG expressed in childhood and adulthood may be inherited. METHODS: Birth records on HC from 144,273 boys, of whom 732 had PMG, were linked to data concerning intelligence level, mental retardation, and impairment of vision and hearing. A potential association between PMG at birth and mental retardation was also examined in 3,204 mentally retarded boys and girls. Parent-offspring similarity for PMG at birth was determined in 13,585 mother-child pairs. RESULTS: PMG was significantly associated with low intelligence level (odds ratio, 1.32; 95% confidence interval [CI], 1.11 to 1.38). The estimated odds ratio for mental retardation in PMG cases versus controls was 1.31 (95% CI, 0.80 to 2.02). There were no differences in frequencies of vision and hearing impairments between PMG cases and controls. Associations between mother's and child's birth weight-normalized HC (r = 0.14; p<0.0001) and PMG (odds ratio, 2.55; CI, 2.00 to 3.25) were found, supporting a multifactorial inheritance of PMG. CONCLUSIONS: PMG at birth is a risk factor for low intelligence level but not for vision and hearing impairments. The heritability of HC and PMG is moderate.

Adult↗

PubMed2003

Intelligence and class mobility in the British population.

Performance on intelligence tests is known to be associated with class mobility, with high scorers tending to move up the socio-economic hierarchy, and low scorers tending to move down. However, much remains unknown about the association. It is possible that the importance of intelligence varies across different occupational areas, or that there is friction acting against mobility, such that a person from an underprivileged background would have to be more intelligent in order to reach a given position than someone who had had greater social advantage. Data from a longitudinal study of a broad, socially representative cohort of the British population (the NCDS) are used to investigate these questions. The results show that intelligence test scores in childhood are associated with class mobility in adulthood uniformly across all social classes. There is no evidence that those from underprivileged backgrounds have to be disproportionately able in order to reach the professional classes. The study reveals an apparently high level of social mobility and meritocracy in contemporary Britain.

Adolescent↗

PubMed2004

A possible model for understanding the personality--intelligence interface.

Despite the recent increase in the number of studies examining empirical links between personality and intelligence (see Hofstee, 2001; Zeidner & Matthews, 2000), a theoretical integration of ability and nonability traits remains largely unaddressed. This paper presents a possible conceptual framework for understanding the personality-intelligence interface. In doing so, it conceptualizes three different levels of intelligence, namely, intellectual ability (which comprises both Gf and Gc), IQ test performance and subjectively assessed intelligence (a mediator between personality, intellectual ability and IQ test performance). Although the model draws heavily upon correlation evidence, each of its paths may be tested independently. The presented model may, therefore, be used to explore causation and further develop theoretical approaches to understanding the relation between ability and nonability traits underlying human performance.

Humans↗

PubMed2005

Psychopathy and intelligence: a second look.

Empirical studies using the PCL-R (Hare, 2003) have shown no intelligence differences between psychopaths and nonpsychopaths. However, Cleckley (1976) argued that psychopaths often show superior intelligence. The purpose of the present study was to test the hypothesis that the correlation between intelligence and severity of criminal development is the opposite in psychopaths than in nonpsychopathic criminals using a sample of 370 men sentenced for violent (nonsexual) crimes. That pattern would provide a way of explaining the discrepancy between Cleckley's view and later empirical work. The results showed that for nonpsychopaths, higher total IQ and particularly verbal intelligence meant a later start in violent crime. For those diagnosed as psychopaths, however, this association was reversed.

Adult↗

PubMed2001

Testosterone and nonverbal intelligence in right-handed men with successful and unsuccessful educational levels.

The relationship between serum total testosterone (T) concentration and fluid intelligence (nonverbal, spatial) was studied in consistently right-handed men with successful (S) or unsuccessful educational levels (NS). Hand preference was assessed by the Edinburgh Handedness Inventory. Nonverbal intelligence was measured by Cattell's Culture Fair Intelligence Test. Serum T level was determined using chemiluminescence enzyme-immunoassay on hormone autoanalyzer. There was no significant difference between the mean T levels of the S subjects and NS subjects, although S-men tended to have higher T levels than NS-men. The mean IQ was found to be significantly higher in S-men than NS-men. In the total sample (S + NS men), the correlation between T to IQ was best described by a polynomial regression (3rd order), exhibiting an inverse U-shaped regression. In S-men, the relationship between T and IQ was best described by a polynomial regression equation of the 3rd order; however, the relationship was not U-shaped, but rather a positive correlation (low T: low IQ and high T high IQ). In NS-men, there was an inverse U-shaped correlation between T and IQ (low and very high T: low IQ and moderate T: high IQ). The present data suggest that (i) very low and very high serum T concentrations may be disadvantageous, (ii) moderate T levels may be advantageous for general fluid intelligence, and (iii) a prewired cerebral organization may be essential for the T effects on cognitive abilities.

Adult↗

PubMed1988

The relationship between nonverbal intelligence, familial sinistrality and Geschwind scores in right-handed female subjects.

I proposed that there might be a strong relationship between the psychological and motor systems, and argued that hand preference could be related to intelligence; higher IQs are to be expected in right-handers with familial sinistrality (FS) than without FS (Tan, in press). This hypothesis was tested in this work. Cattle's Culture Fair Intelligence Test was used to assess the ability of spatial reasoning in right-handed females. Hand preference was assessed by the Edinburgh Handedness Questionnaire; a laterality score (Geschwind score) was calculated for each subject. The sample from the Nursery High-school had a significantly lower mean IQ than that from the Medical Faculty. The incidence for the consistent right-handers was significantly higher in the sample with lower mean IQ than that with higher mean IQ. The incidence for the weak right-handers was significantly higher in the sample with higher mean IQ than that with lower mean IQ. The incidence for familial sinistrality was significantly higher in the sample with higher mean IQ than that with lower mean IQ. It was concluded that handedness, familial sinistrality, and intelligence are interrelated traits; an attenuation in cerebral asymmetry as a result of an increase in the right hemisphere's mental abilities, reflecting itself in weak right-handedness in conjunction with FS, could be a prerequisite for well-developed nonverbal intelligence.

Adult↗

PubMed1989

Nonverbal intelligence, familial sinistrality and left-handedness.

The interrelations among Geschwind scores, familial sinistrality, and nonverbal intelligence were studies in left-handed males and females. Nonverbal intelligence (spatial reasoning) was assessed by Cattle's Culture Fair Intelligence Test. Hand preference was assessed by the Edinburgh Handedness Inventory, and a laterality score (Geschwind score) was calculated for each subject. The mental ability for spatial reasoning was found to be related to the degree of the left-hand preference in conjunction with familial sinistrality. Moderate left-handedness was found to be advantageous for nonverbal intelligence. It was concluded that cognitive and motor functions are interrelated systems; the efficiency of the spatial reasoning would depend on the degree and developmental level of cerebral lateralization.

Adult↗

PubMed2001

[Snijders-Oomen Nonverbal Intelligence Test: useful for the elderly?].

The feasibility of the SON-R 5 1/2-17, a non-verbal intelligence test for deaf children, was investigated in a group of older adults, with a view to the future use of the test in older neurological patients. In a group of 58 healthy elderly persons intelligence was measured with the SON, the Raven Progressive Matrices and a Dutch reading test. The subjects were also asked for their subjective judgements of the tests. The SON-R 5 1/2-17 appears to be a user-friendly test. The high correlations between the subtests, and between the SON and other measures of intelligence suggest that the SON is a valid test for measuring fluid intelligence in elderly persons. The existing norms are not suitable when the SON is used in elderly people, new norms for adults should therefore be developed.

Aged↗

PubMed2001

Current-events knowledge in adults: an investigation of age, intelligence, and nonability determinants.

This study expanded the scope of knowledge typically included in intellectual assessment to incorporate domains of current-events knowledge from the 1930s to the 1990s across the areas of art/humanities, politics/economics, popular culture, and nature/science/technology. Results indicated that age of participants was significantly and positively related to knowledge about current events. Moreover, fluid intelligence was a less effective predictor of knowledge levels than was crystallized intelligence. Personality (i.e. Openness to Experience) and self-concept were also positively related to current-events knowledge. The results are consistent with an investment theory of adult intellect, which views development as an ongoing outcome of the combined influences of intelligence-as-process, personality, and interests, leading to intelligence-as-knowledge (P. L. Ackerman, 1996b).

Adult↗

PubMed1986

Disparities in mentally retarded persons' IQs derived from different intelligence tests.

For mildly and moderately mentally retarded individuals, the Wechsler Adult Intelligence Scale--Revised measures at about the same level as the Wechsler Adult Intelligence Scale, and, consequently, it also produces much higher IQs than do the Wechsler children's scales or the Stanford-Binet Intelligence Scale, Form L-M, despite high intertest correlations. This unsatisfactory state of affairs is due primarily to inadequate standardization sampling, particularly in the lower range of intelligence. Rather than abandon the IQ, corrective action should be taken.

Adolescent↗

PubMed1981

The intelligence of hydrocephalic children.

In a group of 78 children with hydrocephalus in the first months of life, the level and pattern of intelligence were considered in relation to various parameters and symptoms of their condition. These included demography (age, sex, handedness); early developmental status; symptoms (visual, motor, and seizure); formative pathology; type of hydrocephalus; site of CSF obstruction; extent and configuration of cortical thinning; and shunt treatment. The common outcome of early hydrocephalus is an uneven growth of intelligence during childhood, with nonverbal intelligence developing less well than verbal intelligence. The origin of this selective cognitive deficit is in neither the hydrocephalic condition itself nor its treatment, but rather in the developmental brain anomalies and symptoms to which the hydrocephalic child is prone: In children with aqueduct blocks and intraventricular hydrocephalus, a selectively thin vertex and occipital lobe; in any hydrocephalic child, ocular abnormalities, motor deficits, and seizures.

Age Factors↗

PubMed1985

Acceptability and intelligibility of tracheoesophageal speech.

The original Blom-Singer voice prosthesis, introduced in 1979, has been recently modified to provide lower airway resistance. A tracheostoma breathing valve, introduced in 1982, permits unrestricted two-way breathing, yet eliminates the need for manual occlusion of the stoma. To date, the acceptability and intelligibility of tracheoesophageal (TE) speakers, using these prostheses, has not been extensively studied. Forty-six naive listeners rated the acceptability and intelligibility of 15 TE speakers, all of whom were wearing the tracheostoma breathing valve and a prototype low-pressure prosthesis. Acceptability was judged on an equal-appearing interval scale. Intelligibility judgments were based on randomized word lists of 50 items. Results suggest a high level of acceptability and intelligibility among both male and female TE speakers.

Evaluation Studies as Topic↗

PubMed1997

Children with in utero cocaine exposure do not differ from control subjects on intelligence testing.

OBJECTIVE: To determine if in utero cocaine exposure affects IQ scores in children at age 4 years. DESIGN: A prospective, longitudinal evaluation by blinded examiners of the IQ scores of cocaine-exposed and control children of low socioeconomic status who have been observed since birth. SETTING: A study center in an inner-city hospital. PARTICIPANTS: One hundred one children with in utero cocaine exposure and 118 control children, all of whom were 34 weeks' gestational age or older and nonasphyxiated at birth. MAIN OUTCOME MEASURE: Intelligence quotient scores on a standardized intelligence test, the Wechsler preschool and Primary Scale of Intelligence--Revised. RESULTS: Seventy-one cocaine-exposed and 78 control children were administered the Wechsler Preschool and Primary Scale of Intelligence--Revised. Maternal, natal, and 30-month characteristics of the children tested did not differ from those not tested. Groups did not differ on mean Performance (83.2 vs 87.0), Verbal (79.0 vs 80.8), or Full Scale (79.0 vs 81.9) IQ scores (all P > or = .10 [values for cocaine-exposed children given first]). None of these 3 scores was associated with cocaine exposure in multivariate linear regressions. Although cocaine-exposed and control groups did not differ in outcome, 93% of cocaine-exposed and 96% of control children had Full Scale IQ scores below 100, the mean IQ score for the test. CONCLUSIONS: In an inner-city cohort, IQ scores did not differ between cocaine-exposed and control children. However, both groups performed poorly.

Child Development↗

PubMed1997

Digital anomalies, microcephaly, and normal intelligence: new syndrome or Feingold syndrome?

We present four patients-two boys and their mother and an unrelated girl-with microcephaly, normal intelligence, and digital abnormalities. The hand abnormalities are characterized by brachydactyly with radial clinodactyly of the fourth and fifth fingers, ulnar clinodactyly of the second fingers, and an increased space between the second and third fingers associated with an abnormal palmar crease that extends to the ulnar border. The foot abnormalities include short toes with syndactyly of the fourth and fifth toes. The mother has normal intelligence, and her sons and the unrelated girl have normal development. Although similar digital abnormalities, microcephaly, and normal intelligence were described by Feingold in patients with gastrointestinal atresia, we think that our patients' findings represent a different condition. The most likely mode of inheritance is autosomal dominant. The clinical recognition of this syndrome will allow for appropriate genetic counseling as well as provision of information on natural history, i.e., normal intelligence.

Abnormalities, Multiple↗

PubMed2000

Psychometric intelligence differences and brain function.

Psychometric intelligence attracts a converging consensus about its phenotypic structure. Mental ability test scores have proven predictive validity. However, although individual differences in mental abilities can be measured, they are not understood. A long-standing aim of the 'London School' of British psychologists, since Galton and Spearman, is to understand the origins of psychometric intelligence differences in terms of individual differences in brain processes. The history of this research is described, as is the rise in interest since the 1970s. The first problem, met since antiquity, is to discover the relevant levels of brain function. Thus, aspects of brain function that 'explain' psychometric intelligence differences are sought at psychometric, cognitive, psychophysical, physiological, neurochemical and genetic levels. The growing points and dead-ends within each of these levels are identified. Special attention is given to research that crosses levels of description of brain function. Two types of multi-level brain function research are discussed, 'correlational' and 'circumstantial/experimental,' and examples of each are described. Illustrating both approaches, there is a detailed account of research on inspection time that discusses how psychometric intelligence-brain process correlations at one level (psychophysical) may be expanded using event-related potentials, psychopharmacology and functional magnetic resonance imaging.

Brain↗