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Individual Differences and Stimulus Discriminability in Visual Comparison Reaction Time

Individual subjects' reaction time functions in a simple visual comparison task were found to be substantially correlated with measures of spatial ability. In an additional task requiring responses to target stimuli flanked by stimuli associated with competing responses, a sample of high spatial subjects showed little deficit in performance, while a sample of low spatial subjects showed large deficits in performance compared to reaction time to a target stimulus presented alone. These results were interpreted in terms of the interaction between human aptitude and task requirements. The experiments reported are part of an ongoing investigation of spatial ability and visual information processing.