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Felix Würtz, Julie Krans, Simon E. Blackwell, Jan Christopher Cwik, Jürgen Margraf, Marcella Woud

• \(\bf Background\) Dysfunctional appraisals are a key mechanism in posttraumatic stress disorder (PTSD). Experimental manipulations of appraisals via Cognitive Bias Modification-Appraisal (CBM-App) training targeting cognitions related to the ‘self’ has shown to affect analog trauma symptoms. The present study aimed to conceptually replicate and extend previous findings by comparing a newly developed 'world' to the original 'self' training, and investigate the moderating role of locus of control (LOC) on intrusions. \(\bf Methods\) Healthy participants (\(\it N\) = 173) were exposed to distressing films as an analog trauma induction. Next, participants received positive or negative CBM-App, targeting either self- or world-relevant appraisals. Dysfunctional appraisals and LOC were assessed pre- and post-training. During the week after the laboratory session, participants recorded their intrusions and associated distress in a diary. One week later, trauma-relevant symptomatology was assessed. \(\bf Results\) Positive compared to negative CBM-App induced training-congruent appraisals, independent of the trained cognition (self vs. world). However, there was no effect on analog trauma symptoms and LOC did not moderate the training’s effect. \(\bf Conclusions\) Our results underline the validity of CBM-App as a method to experimentally manipulate appraisals. However, since we did not fully replicate previous findings further research on mechanisms associated with transfer effects is warranted.