The effects of retinal displacement on reaction time and parameters within the Hick Paradigm were studied, using 80 university students. Focus was on the effects of practice, order, and visual attention. The effect of retinal displacement was of no practical or theoretical importance in the context of Jensen's research. (SLD)

Relationships among Multidimensional Aptitude Battery scores, inspection time, choice reaction time, and the odd-man procedure were investigated for 63 female and 25 male adults. No significant relationships were found for these mental speed measures and the Eysenck Personality Questionnaire-Revised dimensions of extraversion, neuroticism, and…

Measures of four-choice reaction time, inspection time, and scores on a speeded coding-substitution task obtained from 104 adults aged 54 to 85 years were found to account for almost all age-related changes in cognitive performance on a number of indices of general fluid ability. (SLD)

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…

To assess the effects of timed/untimed testing conditions on intelligence scores, high school students were assigned to an intelligence test under either conditions and subsequently to a battery of eight reaction time tests. Results showed that subjects scores were related to the speed with which they processed information. (JAZ)

Mental-rotation task response times from 12 studies involving 505 adults--251 males and 254 females--were used to evaluate 5 hypotheses concerning sex differences derived from an X-linked genetic model. The model assumes that task facilitation in speed of mental rotation is mediated by a recessive gene. Four hypotheses derived from the model were…

Experiments with 35 male/39 female college students and 220 male Navy recruits examined the nature of a general ability factor of intelligence--Spearman's "g." Patterns related to task complexity and reaction time variability were studied. "g" appears related to the ability to reconfigure working memory contents flexibly and…

To assess whether movement artifacts reported in visual inspection time (IT) tasks were under metacognitive control, 29 young adults in Edinburgh (Scotland) were tested on a dual-task paradigm in which IT was conducted along with a concurrent task. Reports of movement artifacts are not usually examples of metacognitive processing. (SLD)

The effects of controlling for individual differences in simple reaction time (RT) on the correlations of choice RT and discrimination RT with intelligence quotient were studied for 213 male college students. Simple RT was controlled by subtraction, partial correlation, and multiple correlation. (SLD)

Three experiments investigated the possibility that adult age differences on block design tasks originate because of reduced efficiency with increased age in the cognitive processes associated with block manipulation. Older adults were substantially slower and less efficient than younger adults in performing tasks with minimized design…

Two studies involving 333 military recruits investigate individual differences in time-accuracy functions of inspection time (IT) in terms of psychological models. Two alternative interpretations of IT time-accuracy functions (processing-distraction and processing-speed, and pure processing-speed "cascade" models) are considered in…

Results with 54 mice confirm that increased stimulation or usage, as would be provided by environmental enrichment (EE), increases peripheral nerve conduction velocity. These results suggest a role at the physiological level for EE (or deprivation) in affecting measured intelligence. (SLD)

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)

Five major trends in the study of intellectual abilities are identified. These suggest that in the future several kinds of tests will be used to measure several kinds of basic processes of intelligence. There will be a corresponding decrease in concern to measure a single attribute of general intelligence. (Author/RD)

Two methodological issues involved in determining the relationship between learning and general intelligence were examined: (1) the use of learning strategies in a paired-associate task and (2) the importance of time (rather than errors) in the measurement of learning efficiency. (Author/RD)