This study explores whether or not intelligence tests' scores predict individual differences in scholastic achievement irrespective of SES factors such parents' income and education. The variables of interest are analyzed considering three independent samples of participants comprising a total of 641 children. The participants belonged to a…

Tested whether tonic EEG power is related to memory performance by analyzing ongoing EEG for 60 subjects in 5 experimental conditions. Subjects with good memory performance had significantly larger upper alpha power, but less theta and lower alpha power. Also discusses findings for subjects good at calculation. (SLD)

Studied whether a primary imagery (IM) factor can be identified as a separate dimension of individual differences in the spatial ability domain. Findings for 213 adults suggest the existence of three first-order IM factors, and a second-order confirmatory factor analysis suggests that the visual imagery dimensions can be located within the spatial…

Whether IQ level exerts a differential effect on the impairment of cognitive performance induced during acute hypoglycemia was studied for 24 nondiabetic adults. At various levels of hypoglycemia, no overall effect of IQ on deterioration was noted. Higher IQ did not apparently protect against adverse effects. (SLD)

Age related declines in fluid intelligence were accounted for by age-related declines in a general latency factor (cognitive speed) for 63 adults aged 26 to 80 years, but results called into question the assumption that cognitive speed accounts for all individual IQ differences. (SLD)

Vertex event-related potentials (ERPs) were obtained from undergraduates performing an inspection time task together with measures of inspection time (n=35) and mental ability (n=28). Techniques that reveal changes over time in the relationship between ERP measures and psychometric indices were presented. (SLD)

A theoretical overview of the relationship between nonacademic aspects of intelligence and success in immigrating is presented, and an empirical study involving 65 scientists who immigrated to Israel is reported. Findings suggest that the individual intelligence of the immigrant is a major determinant of immigration success. (SLD)

Studied a new method of measuring speed of processing, the modified blink reflex (MBR), in 2 experiments involving 57 adults. Findings are consistent with the view that interconnecting pathways allow higher level processing of a tone to prime the lower-level reflex pathway. Discusses implications for MBR and measurement of speed of processing.…

Using a simple neural model comprising between two and four neurons, it is concluded that speed of neuron conduction is not the probable basis of the intelligence quotient (IQ)-reaction time (RT) correlation. This result illustrates that neural modeling can be applied to biological theories of individual differences in intelligence. (SLD)

The relationship between reasoning ability, as indicated by performance on conventional reasoning tests, and working memory capacity was investigated in 4 studies involving 723, 412, 414, and 595 military recruits, respectively. The results demonstrate a consistently high correlation between general reasoning ability and general working-memory…

The Zahlen-Verbindungs-Test (ZVT) represents a highly feasible measure of information-processing speed that correlates quite highly with standard psychometric tests of intelligence. The present study was designed to identify specific stages of the sensorimotor processing system that may account for individual differences in overall variability of…

The predictability of individual differences in the ability to reason about dynamic displays from tests using static displays was studied in 170 adults given paper-and-pencil and computer controlled tests. Several multivariate analyses indicated that the ability to reason about dynamic motion was distinct from the ability to reason about static…

Dewey's notion of "reflective thinking" is discussed. A model of phases of reflective thinking is described: problem recognition, enumeration of possibilities, reasoning, revision, and evaluation. Each phase has at least one parameter governing its operation and one rule for setting the optimum parameter value. Sources of individual…

It is argued that intelligent behavior cannot be understood without reference to inhibitory processes. A review of research findings suggests that resistance to interference and the capacity for inhibition are important sources of individual differences, associated with the operation of the frontal lobes of the brain. (SLD)

Studied the associations between scores on a test of general mental ability and reaction time, measured with a "Hick"-style device, using a sample of 900 adults (aged 56 years) in Scotland. Results agree with literature reviews suggesting that reaction times and their variabilities are stronger correlates of mental test scores than are…