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The persecutory ideation questionnaire.

Ryan McKay1, Robyn Langdon, Max Coltheart

  • 1Macquarie Centre for Cognitive Science, Macquarie University, Sydney, Australia.

The Journal of Nervous and Mental Disease
|August 16, 2006
PubMed
Summary
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Researchers developed the Persecutory Ideation Questionnaire (PIQ) to measure persecutory thoughts. The PIQ demonstrates strong reliability and validity in both clinical and non-clinical populations for assessing persecutory ideation.

Area of Science:

  • Psychiatry and Psychology
  • Mental Health Assessment
  • Clinical Psychology

Background:

  • Persecutory ideation is a key symptom in various psychiatric disorders.
  • Accurate and brief measurement tools are needed for clinical assessment and research.
  • Existing measures may not specifically capture the nuances of persecutory ideation.

Purpose of the Study:

  • To develop and evaluate a brief, theoretically-driven questionnaire for measuring persecutory ideation.
  • To establish the reliability and validity of the new measure, the Persecutory Ideation Questionnaire (PIQ).
  • To differentiate specifically persecutory ideation from general paranoia.

Main Methods:

  • Development of the Persecutory Ideation Questionnaire (PIQ) based on definitional criteria.

Related Experiment Videos

  • Item selection involved 10 independent raters sorting 66 paranoia-related items.
  • Evaluation of the PIQ in nonclinical and clinical samples, assessing reliability and validity.

    • Main Results:

    • The PIQ consists of 10 items selected with an 80% rater agreement criterion.
    • The PIQ demonstrated excellent internal consistency (reliability) in both samples.
    • The PIQ showed excellent convergent validity with general paranoid ideation measures and unique criterion validity for specific persecutory ideation.

    Conclusions:

    • The Persecutory Ideation Questionnaire (PIQ) is a reliable and valid brief measure for assessing persecutory ideation.
    • The PIQ effectively distinguishes specific persecutory ideation from broader paranoid ideation.
    • The PIQ is a valuable tool for research and clinical settings requiring assessment of persecutory thoughts.