Successful Treatment of Paranoia (STOP)

What is the study?

The STOP (Successful Treatment of Paranoia) study follows on from the now completed Cognitive Bias Modification for Paranoia (CBM-pa) study. You can read a summary of the results here.  

The STOP study aims to develop and test if a new smartphone app version of the approach developed in the CBM-pa study can help people with paranoid or threatening thoughts.   

CBM-pa is a digital programme which can help people think about potentially paranoia-inducing situations in different ways. The app will use examples of everyday situations and help people come up with alternative explanations for these situations which are less likely to cause paranoid thinking.

273 people will be recruited to the study in total. Half will be shown short sections of text that might have a paranoid or threatening interpretation and asked to complete missing letters.

The other half will be shown sections of text that are intended to be neutral, and have no obvious paranoid interpretations. People will be randomly allocated to either of these two groups.   

Why is this research important?

Paranoia is associated with a range of mental health issues, including psychosis. Psychosis can be a disabling mental health issue, and is associated with distress and problems in work, family and social functioning.

The STOP study will aim to make the CBM-pa approach more accessible to a greater number of people by developing and testing a smartphone app which people can use when and where they want.  

How are McPin and people with lived experience of mental health issues involved?

McPin is working with researchers based at the Institute of Psychiatry, Psychology, and Neuroscience (IOPPN), which is part of King’s College London, and Bath University.

Our role is to provide service user involvement in the study. We support a Lived Experience Advisory Panel (LEAP) of six service users. Our Head of Public Involvement Thomas Kabir is also a co-investigator on the study.

McPin’s input will include:

  • Organising regular LEAP advisory meetings in each year of the study
  • Coordinating service user input for the development and user testing of the STOP smartphone app
  • Coordinating additional ad-hoc service user work, including testing over a hundred brief examples of situations for their readability and appropriateness, to be used in the app in the randomised controlled trial
  • Helping to recruit participants to the study
  • Contributing to dissemination activities in the final year of the project

How long will the project run?

This study began in March 2021 and will continue for four years until February 2025.

Who do I contact for more information?

You can contact Thomas Kabir by email at for more information.