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Psychosis and Hallucinations Questionnaire (PsycH-Q)
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Supplemental: Parkinson's Disease (PD)
Short Description of Instrument
The Psychosis and Hallucinations Questionnaire (PsycH-Q) was developed for use in PD and is a 20 item self-report questionnaire to detect psychosis phenomena and associated symptoms falling into 5 categories: visual misperceptions, sensory misperceptions, disordered thought, attentional dysfunction, and sleep impairment (Shine et al, 2015).
Comments/Special Instructions
Informant-appraisals on the PsycH-Q have been examined (Muller et al., 2018).
Scoring and Psychometric Properties
Scoring: The frequency of a symptom occurrence is rated from 0 ("never") to 4 ("daily"). The severity of each positive symptom is rated from 1 ("not at all distressing") to 4 ("extremely distressing").
Sub-scale scores are obtained for the 5 categories (visual misperceptions (4 items), sensory misperceptions (4 items), disordered thought (3 items), attentional dysfunction (4 items), and sleep impairment (5 items)).
A "Section I Hallucinations" and "Psychosis Score" is obtained by summing scores on the visual misperceptions, sensory misperceptions, and disordered thought categories. A Section II Hallucinations Phenotype Score is obtained by summing scores on attentional dysfunction and sleep impairment categories. Section I was created as a screening tool for psychosis in PD and Section II was created as an exploratory tool.  
Total Scores are the sum of all scores.
Psychometric Properties: Internal consistency reported for 20 items: Cronbach's alpha 0.900 for frequency and 0.908 for severity, Test-retest reliability reported: ICC = 0.928.
Strengths: Fast, self-report measure that Includes spectrum of psychotic features like presence and passage hallucinations, that often occur in PDD.
Weaknesses: PsycH-Q has had limited use to date and sensitivity to change is unknown.
Key Reference:
Shine JM, Mills JMZ, Qiu J, O'Callaghan C, Terpening Z, Halliday GM, Naismith SL, Lewis SJG. Validation of the Psychosis and Hallucinations Questionnaire in Non-demented Patients with Parkinson's Disease. Mov Disord Clin Pract. 2015 Mar 16;2(2):175-181.
Additional Reference:
Muller AJ, Mills JMZ, O'Callaghan C, Naismith SL, Clouston PD, Lewis SJG, Shine JM. Informant- and Self-Appraisals on the Psychosis and Hallucinations Questionnaire (PsycH-Q) Enhances Detection of Visual Hallucinations in Parkinson's Disease. Mov Disord Clin Pract. 2018 Nov 8;5(6):607-613.
Document last updated August 2022