Abstract
Spatial ability is discussed in terms of psychometric factors and information processing research. Reanalysis of major psychometric studies suggests two major spatial factors — spatial relations and spatial visualization ability. Apparent differences between these factors in speed versus power and cognitive complexity are verified by process analyses of individual differences in spatial relations and visualization ability. Information processing studies suggest multiple sources of individual differences such as process execution speed, quality and capacity of representation, process coordination and strategies for problem solution. Consideration is also given to additional issues for research as well as implications for testing.
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