Depression and causal attributions for success and failure.

The present study investigated the effects of depression on causal attributions for success and failure. Specifically, female university students were separated into depressed and nondepressed groups on the basis of Costello--Comrey Depression Scale scores, and then received either 20%, 55%, or 80% reinforcement on a word association task. Following the task, attributions were made for outcome using the four factors of effort, ability, task difficulty, and luck. In accord with predictions generated from a self-serving biases hypothesis, nondepressives made internal (ability, effort) attributions for a successful outcome (80% reinforcement) and external attributions (luck, task difficulty) for a failure outcome (20% reinforcement). As predicted from consideration of the self-blame component of depression, the attributions made by depressives for a failure outcome were personal or internal. Contrary to expectations, depressives also made internal attributions for a successful outcome. The findings for depressives were discussed in relation to the recently revised learned helplessness model of depression, which incorporates causal attributions. For nondepressives, the findings were considered in terms of the self-serving biases hypothesis.