The Cardiff Anomalous Perceptions Scale (CAPS): a new validated measure of anomalous perceptual experience

Schizophr Bull. 2006 Apr;32(2):366-77. doi: 10.1093/schbul/sbj014. Epub 2005 Oct 19.


The study describes the Cardiff Anomalous Perceptions Scale (CAPS), a new validated measure of perceptual anomalies. The 32-item CAPS measure is a reliable, self-report scale, which uses neutral language, demonstrates high content validity, and includes subscales that measure distress, intrusiveness, and frequency of anomalous experience. The CAPS was completed by a general population sample of 336 participants and 20 psychotic inpatients. Approximately 11% of the general population sample scored above the mean of the psychotic patient sample, although, as a group, psychotic inpatients scored significantly more than the general population on all CAPS subscales. A principal components analysis of the general population data revealed 3 components: "clinical psychosis" (largely Schneiderian first-rank symptoms), "temporal lobe disturbance" (largely related to temporal lobe epilepsy and related seizure-like disturbances) and "chemosensation" (largely olfactory and gustatory experiences), suggesting that there are multiple contributory factors underlying anomalous perceptual experience and the "psychosis continuum."

Publication types

  • Validation Study

MeSH terms

  • Adolescent
  • Adult
  • Cognition Disorders / epidemiology*
  • Female
  • Hospitalization
  • Humans
  • Male
  • Middle Aged
  • Perceptual Disorders / diagnosis*
  • Perceptual Disorders / epidemiology*
  • Psychotic Disorders / epidemiology
  • Psychotic Disorders / rehabilitation
  • Reproducibility of Results
  • Schizophrenia / epidemiology*
  • Surveys and Questionnaires*