On the partial independence of optimism and pessimism

This study tested the hypothesis that the moderate correlation between optimism (O) and pessimism (P) scores (their non-bipolarity) found in earlier studies may be an artifact of the differential sensitivity of O and P items to two response sets: defensive pessimism and Pollyannaism. The data failed to support either component of the hypothesis. Thus, defensive pessimists, as measured in two quite different ways, had lower depression scores (BDI) than genuine pessimists, but contrary to prediction, had higher depression scores than optimists. Moreover, deleting P items with a strong defensive quality from the P scale failed to increase the correlation between O and P scores. Similarly, controlling Pollyannaism by a partial correlation procedure failed to increase the strength of the relation between O and P. The results in general support the notion that optimism and pessimism are not polar opposites. This article is based on a dissertation presented by the senior author to the Division of Graduate Studies and Research of the University of Cincinnati in partial fulfillment of the Doctor of Philosophy degree.