Social and Behavioral Sciences Commons^™

The Minnesota Multiphasic Personality Inventory Pessimism–Optimism Scale As A Predictor In Depression Change After Medication Treatment And Placebo, Donna J. Winsor

Walden Dissertations and Doctoral Studies

The field of positive psychology has included research on the personality traits of optimism and pessimism and how they predict depression; however, there has been limited investigation on whether these characteristics can predict treatment outcomes. This study used a quantitative nonexperimental design with archived data provided by Summit Research Network, to evaluate whether pessimism or optimism, as measured by the Pessimism–Optimism (PSM) scale of the Minnesota Multiphasic Personality Inventory, had an effect on depression and somatic symptom change in 98 adults with depression who were randomized into imipramine, alprazolam, or placebo treatment. Seligman’s explanatory style theory was used to guide …