Abstract
Twenty-four groups of subjects of widely varying chronological ages (CA: 6–21 years), mental ages (MA: 5–17 years) and IQs (30–130) took part in a complex reaction time (RT) task in which they had to fixate a point midway in a horizontal array of four light reaction signals (RSs). Probability of RS onset varied between 11 and 44 percent, and warning intervals of 1, 3 and 5 seconds were used in an irregular procedure. The warning signal was a tone. Analysis of performance of subjects across three trial blocks, each block consisting of twenty-seven trials, showed that only groups of subjects with mean IQs of 50 or below showed significant practice effects, whereas more able subjects did not.
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