Two experiments were reported, both concerned with the effects ofnMR values and the presence or absence of categorical relationships within pairs under intentional and incidental learning. In the first experiment free recall was studied, in the second R-S recall after paired-associate learning. In line with prior work in the literature, it was expected that performance on non-categorized, low MR pairs would be inferior under incidental learning but that intentional and incidental learning would show no differences for high MR, non-categorized pairs or for categorized pairs at any MR value. The results do not support these expecta¬tions (of an interaction) at all clearly, although the factors of categorization and MR value appear to operate much as past work would predict. The experiments are not considered to be crucial with respect to the expected interaction, as the free-recall lists were short and homogeneous and R-S recall for the pairs used was very high.
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