Whether relations between intelligence test performance and information processing measures depend on individual differences in speed-accuracy preferences rather than capacity limitations and whether the impact of strategic variables changes with increasing age or extraversion was studied with 83 adults ages 50 to 79 years. Results are discussed…

The relationship between psychometric intelligence and reaction times (RT) was studied in 60 undergraduates using an elementary cognitive task, the Sentence-Picture Verification Test. Results, which show that psychometric intelligence is substantially correlated with RTs even after practice, support the mental speed hypothesis of general…

Because they used an inappropriate statistical procedure, J. H. Kranzler and A. R. Jensen (1991) have not demonstrated that a factor of general intelligence ("g") depends on several independent factors. A factorial reanalysis of their data suggests that speed and efficiency of information processing are important in "g." (SLD)

The hypothetical idea of a perfectly pure psychometric "g" is empirically unattainable. Because the unity of "g" cannot be proved or disproved by factor analysis, the unitary "g" hypothesis represents a parsimonious assumption. J. B. Carroll's (1991) analysis demonstrates the relationship between psychometric and…

Shows changes in the distribution of scores on a set of tests used by the Danish draft board since the late 1950s to the present. The marked gains in cognitive abilities seen in the earlier years have been replaced by very modest gains in the last 10 years. These recent gains appear primarily in a test of visuo-spatial abilities. (Author/SLD)

Eight tactile-kinesthetic indices and 27 cognitive-ability and mental-speed measures were administered to 195 college students and community members. Results suggest that tactile-kinesthetic abilities share much with broad visualization and fluid intelligence, little with crystallized intelligence, and differential relationships with speed related…

The new paradigm of evolutionary social science suggests that humans adjust rapidly to changing economic conditions, including cognitive changes in response to the economic significance of education. This research tested the predictions that cross-national differences in IQ scores would be positively correlated with education and negatively…

Substitution tests have a long history in psychology because of their simplicity of administration and their sensitivity to individual differences related to complex cognitive performance. Despite their widespread use there is no agreement on what the substitution test measures. The present study approached this question by applying a method of…

The present paper reports secular trends in the mean scores of a language, mathematics, and a Raven-like test together with a combined general ability (GA) score among Norwegian (male) conscripts tested from the mid 1950s to 2002 (birth cohorts approximately equal to 1935-1984). Secular gains in standing height (indicating improved nutrition and…

This study examined whether a timesharing factor can be identified when a number of competing tasks are presented in the midst of a range of single tests designed to sample a broad range of psychological dimensions. A battery of single and competing tasks was presented to 126 subjects. (Author/LMO)

Adult performance on verbal analogy and classification problems was assessed in terms of outcomes of process execution. Process-outcomes measures accounted for overall performance and were related to ability. Problem forms differed in terms of which measures predicted individual differences. Common process-outcome measures showed highest…

Do stage-related patterns of early cognitive development reported for normally developing children also characterize at-risk and handicapped children when mental age organization of data is used? Mental age predicted Piagetian-based cognitive levels one to three but did not predict highest-level symbolic functioning in 95 handicapped children.…

Patterns of intellectual ability of Arab children aged 6 to 16 years were examined using the new Arab WISC-R. As in prior work, a distinct profile emerged: relative superiority in Verbal over Performance IQ's which diminished with age as a flat profile emerged in adolescence. An environmental explanation is offered. (Author/RD)

Intelligence tests are likely to move toward measuring multiple aspects of ability. Tasks will be less abstract and closer to life experiences of the individual. The metric will change from the present formula to a separate score for each measured ability, normed in relation to cultural and linguistic background. (Author/RD)

This statement signed by 52 researchers outlines conclusions regarded as mainstream among researchers on intelligence, especially on the nature, origins, and practical consequences of individual and group differences in intelligence. The survey from which the statement was developed is described. (SLD)