Abstract
Abstract : Changes in cognitive and behavioral factors have been examined as potential mechanisms of change behind depression s therapeutic response. This study examines cognitive-behavioral factor change across treatments for seasonal affective disorder (SAD). Participants diagnosed with Major Depression, Recurrent, with Seasonal Pattern and a current SAD episode (N = 35) were randomly assigned to light therapy (LT), group cognitive-behavioral therapy (CBT), or a combination treatment (CBT+LT). Participants completed the Automatic Thoughts Questionnaire, Dysfunctional Attitudes Scale, Response Styles Questionnaire, and the Pleasant Events Schedule at pre- and posttreatment. Regardless of treatment group, participants negative automatic thoughts and dysfunctional attitudes improved across treatment, and rumination trended toward improvement. Pleasant event frequency, enjoyment, and derived reinforcement did not change for any group across treatment. Initial dysfunctional attitudes levels did not predict post-treatment depressive symptoms or remission rates. Although differential mechanisms of change between groups were not revealed, cognitive processes appear to change over SAD treatment.
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