Rate of recall as a measure of learning: I. The effects of retroactive inhibition.

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Abstract
"Two experimental groups and a control group were used in the usual design for experiments on retroactive inhibition. The experimental groups learned an interpolated task five min. after the original learning while the control group rested. The original learning series for all groups consisted of 18 nonsense syllables and four three-digit numbers. For one group, the interpolated material consisted of 18 syllables and four three-digit numbers; for the other group, 18 three-digit numbers and four syllables. The lists were presented nine times in random order. The Ss were tested by the method of free recall at the end of the original learning and retested five min. after the interpolated activity. The speed with which responses were given was recorded on both tests. When correct responses are considered, . . . rate of recall differentiates significantly among the experimental conditions . . … Interpolation of items similar to the original learning material causes a greater depression in the rate than interpolation of dissimilar material. Measured by variations in rate of recall, 'isolated' materials (digits) are more susceptible to interference effects than 'crowded' materials (syllables)." (PsycINFO Database Record (c) 2006 APA, all rights reserved)

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