Reasoning in depression: Impairment on a concept discrimination learning task

Abstract

This study compared depressed and nondepressed undergraduates identified by the Beck Depression Inventory on concept discrimination learning problems. In two experiments, both groups generally performed at ceiling when solving simpler 1- and 2-dimensional problems, but the depressed subjects showed significant impairment on 4-dimensional problems. The first experiment investigated the role of storage in task performance. The second experiment was designed to focus attention at critical stages, and also manipulated storage demands. The depressed subjects in each experiment solved fewer problems correctly and made significantly more errors when listing hypotheses; there was little evidence that the experimental manipulations differentially facilitated their performance. The findings are considered in relation to current models of cognitive function in depression.