title: A measure of state persecutory ideation for experimental studies.
abstract: Experimental research is increasingly important in developing the understanding of paranoid thinking. An assessment measure of persecutory ideation is necessary for such work. We report the reliability and validity of the first state measure of paranoia: The State Social Paranoia Scale. The items in the measure conform to a recent definition in which persecutory thinking has the 2 elements of feared harm and perpetrator intent. The measure was tested with 164 nonclinical participants and 21 individuals at high risk of psychosis with attenuated positive symptoms. The participants experienced a social situation presented in virtual reality and completed the new measure. The State Social Paranoia Scale was found to have excellent internal reliability, adequate test-retest reliability, clear convergent validity as assessed by both independent interviewer ratings and self-report measures, and showed divergent validity with measures of positive and neutral thinking. The measure of paranoia in a recent social situation has good psychometric properties.
authors.affiliation: Department of Psychology, Institute of Psychiatry, King's College London, Denmark Hill, London, UK. Daniel.Freeman@iop.kcl.ac.uk
authors.forename: Daniel
authors.initials: D
authors.lastname: Freeman
authors.forename: Katherine
authors.initials: K
authors.lastname: Pugh
authors.forename: Catherine
authors.initials: C
authors.lastname: Green
authors.forename: Lucia
authors.initials: L
authors.lastname: Valmaggia
authors.forename: Graham
authors.initials: G
authors.lastname: Dunn
authors.forename: Philippa
authors.initials: P
authors.lastname: Garety
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D003702:Delusions / Q000175:diagnosis / Q000523:psychology; D003936:Diagnosis, Computer-Assisted / Q000295:instrumentation; D005239:Fear; D005260:Female; D006801:Humans; D033182:Intention; D008297:Male; D008875:Middle Aged; D010259:Paranoid Disorders / Q000175:diagnosis* / Q000523:psychology; D010555:Personality Inventory; D010698:Phobic Disorders / Q000175:diagnosis / Q000523:psychology; D011569:Psychiatric Status Rating Scales / Q000706:statistics & numerical data*; D011594:Psychometrics; D015203:Reproducibility of Results; D012107:Research Design / Q000592:standards; D012919:Social Behavior; D011795:Surveys and Questionnaires; D014584:User-Computer Interface