Abstract
It was hypothesized that redundant information increases the number of correct responses on a double-seriation task, and that irrelevant information has the opposite effect. It was also predicted that these effects are greater for younger than older children. Seventy-two Ss, ages 7 1 2 , 9 1 2 , and 11 1 2 were tested individually on three types of double-series: no added information, one redundant dimension, and one irrelevant dimension. The hypothesis concerning redundancy effects was not supported, but irrelevant information had the predicted detrimental effect for all age groups. The hypothesis concerning the Age × Information Type interaction was not supported, but several other interactions were significant. Several combinations of independent variables were found to be significant sources of variation in the latency-of-solution data.
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