Date of Award




Document Type

Master's Thesis

Degree Name

Master of Arts (MA)


Department of Psychology


Psychology (Masters)

Content Description

1 online resource (ii, 30 pages) : illustrations (some color)

Dissertation/Thesis Chair

Mitch Earleywine

Committee Members

James F Boswell


Depression, Mental, Psilocybin, Cognitive therapy, Depressed persons

Subject Categories



Patient-perceived treatment credibility is linked to important outcome measures including symptom reduction, therapeutic alliance, patient satisfaction, and attrition rates. However, few studies have tested strategies to enhance treatment credibility. The present study investigates the effect of brief, written educational materials and the use of an image induction prime on perceptions of credibility for cognitive behavioral therapy and psilocybin-assisted therapy for depression. Participants (N = 493) rated the perceived credibility of depression treatments before and after reading brief educational materials. Half of the participants were asked an image induction question priming the construct of open-mindedness. Results indicate that brief educational materials of about 300 words significantly increased perceived treatment credibility for both therapies, with a large effect size (Cohen’s d = .91). The use of an image induction prime further increased perceived credibility for psilocybin-assisted therapy for depression (Cohen’s d = .38). These strategies offer an efficient and cost-effective way to enhance treatment credibility. Future studies testing variations of the image induction prime might prove fruitful for optimizing the technique.

Included in

Psychology Commons