Objectives. Understanding factors that contribute to delusional ideation has important clinical implications. This study looked at the impact of mindfulness and negative schemas on changes in delusional ideation over time.

Design. A sample of University students was selected to investigate processes related to delusional ideation in a non-clinical sample.

Method. A web-based survey was completed by 700 University students, 204 of whom completed a second identical survey after 6 months, to comprise the longitudinal sample.

Results. Results from the study demonstrated that negative schemas and mindfulness were related to changes in delusional ideation over time and support was found for a mediated model, whereby mindfulness mediated the impact of schemas on the outcome.

Conclusions. The findings point to the importance of mindfulness as an intervention for preventing non-clinical delusional ideation transitioning into clinical delusions.