Green Paranoid Thoughts Test (R-GPTS)

The Revised Green et al. Paranoid Thoughts Scale was developed to provide a precise, psychometrically sound measure of paranoid thinking across the full spectrum of severity. It is a revision of the original Green et al. Paranoid Thoughts Scale and was refined to improve reliability, clarify factor structure, and establish validated clinical cut-offs. The revised version was formally evaluated and published by Daniel Freeman and colleagues in 2019 in Psychological Medicine.

Paranoia exists on a continuum. Many people in the general population occasionally experience thoughts such as wondering whether others are talking about them or feeling overly sensitive to criticism. These experiences, at mild levels, are relatively common and do not necessarily indicate mental illness. However, when such thoughts become frequent, distressing, or strongly linked to perceived threat or harm, they may reflect clinically significant paranoid ideation. The R-GPTS was specifically designed to measure this full range—from everyday interpersonal sensitivity to severe persecutory beliefs.

The scale is divided into two distinct but related subscales:

Ideas of Reference (Part A).

This subscale assesses thoughts involving social evaluation or indirect reference. Examples include believing others are gossiping, laughing, judging, or dropping hints. These items measure the frequency of thoughts that social interactions carry hidden meanings directed at oneself. While these concerns may be mild and transient for many individuals, elevated scores indicate heightened interpersonal sensitivity and suspicious interpretation of social cues.

Ideas of Persecution (Part B).

This subscale captures stronger, threat-based beliefs. Items assess concerns about deliberate harm, hostility, conspiracy, or intentional mistreatment. Higher scores reflect increasing levels of perceived threat from others. Importantly, research has identified clinical thresholds for this subscale. A Persecution score of 18 or above is associated with a high likelihood of a verified persecutory delusion in clinical samples, although diagnosis requires a comprehensive professional assessment.

A key feature of the R-GPTS is that the two subscales are scored separately. This allows clinicians and researchers to distinguish between elevated social-referential thinking and more severe persecutory ideation. Someone may score high on Ideas of Reference without exhibiting strong persecutory beliefs, and vice versa. Treating the scales independently provides more nuanced interpretation and improves clinical usefulness.

It is important to note that the R-GPTS measures the frequency of paranoid thoughts over the past month, not the degree of conviction or insight associated with those thoughts. The presence of frequent paranoid thinking does not automatically indicate a delusional disorder. Clinical context, level of distress, functional impact, and belief conviction are all critical components of proper assessment.

As a research-based instrument, the R-GPTS has demonstrated strong internal consistency and reliability across both clinical and non-clinical populations. However, free online versions of this test are intended solely for educational and self-reflective purposes. They do not provide diagnosis, treatment recommendations, or clinical judgment. Individuals experiencing significant distress, fear, or impairment related to paranoid thoughts are encouraged to seek evaluation from a qualified mental health professional.

References

• Freeman, D., Loe, B., Kingdon, D., Startup, H., Molodynski, A., Rosebrock, L., et al. (2019). The revised Green et al., Paranoid Thoughts Scale (R-GPTS): Psychometric properties, severity ranges, and clinical cut-offs. Psychological Medicine.