{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,8,17]],"date-time":"2026-08-17T14:49:26Z","timestamp":1786978166788,"version":"build-2736575974"},"reference-count":36,"publisher":"Wiley","issue":"2","license":[{"start":{"date-parts":[[2015,3,16]],"date-time":"2015-03-16T00:00:00Z","timestamp":1426464000000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"funder":[{"name":"Parkinson's NSW Seed Grant"},{"DOI":"10.13039\/501100001036","name":"Australian Rotary Health","doi-asserted-by":"crossref","id":[{"id":"10.13039\/501100001036","id-type":"DOI","asserted-by":"crossref"}]},{"DOI":"10.13039\/100015539","name":"Australian Government","doi-asserted-by":"crossref","id":[{"id":"10.13039\/100015539","id-type":"DOI","asserted-by":"crossref"}]},{"name":"National Health & Medical Research Council of Australia","award":["630434"],"award-info":[{"award-number":["630434"]}]},{"name":"National Health & Medical Research Council of Australia","award":["1008117"],"award-info":[{"award-number":["1008117"]}]},{"name":"National Health & Medical Research Council of Australia","award":["1003007"],"award-info":[{"award-number":["1003007"]}]}],"content-domain":{"domain":["movementdisorders.onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["Movement Disord Clin Pract"],"published-print":{"date-parts":[[2015,6]]},"abstract":"<jats:title>Abstract<\/jats:title>\n                  <jats:p>\n                    People diagnosed with Parkinson's disease (PD) frequently experience visual and non\u2010visual hallucinations often with comorbid psychosis, however, there is currently no gold standard tool for accurately assessing these symptoms. To address this problem, we designed a novel questionnaire to evaluate the presence of hallucinatory and psychotic symptoms in PD, as well as related symptoms, such as attentional dysfunction and sleep disturbance. We administered the 20\u2010item Psychosis and Hallucinations Questionnaire (PsycH\u2010Q) and three common questionnaire measures in a large cohort of 197 patients with idiopathic PD via a postal survey. We established concurrent validity, convergent validity, and internal consistency of the questionnaire and then assessed test\u2010retest reliability in a subcohort of 44 patients. PsycH\u2010Q was found to be a valid instrument when analogous items were compared across three other existing tools (Spearman's rho range: 0.34\u20130.64;\n                    <jats:italic>P<\/jats:italic>\n                    \u00a0&lt;\u00a00.01). PsycH\u2010Q demonstrated a strong relationship between self\u2010reported hallucinations and psychosis and symptoms of the broader hallucinatory phenotype (Kendall's tau\u00a0=\u00a00.41;\n                    <jats:italic>P\u00a0<\/jats:italic>\n                    &lt;\n                    <jats:italic>\u00a0<\/jats:italic>\n                    0.01; positive predictive value\u00a0=\u00a00.97). PsycH\u2010Q also displayed a high level of internal consistency (Cronbach's alpha\u00a0=\u00a00.900; range, 0.696\u20130.923) and reproducibility (intraclass correlation coefficient\u00a0=\u00a00.928). PsycH\u2010Q is a simple, valid, self\u2010completed instrument that reliably identifies hallucinations and psychosis in PD and has the ability to characterize related patterns of attentional and sleep impairments. As such, PsycH\u2010Q is a highly valuable tool for use in both clinical and research settings.\n                  <\/jats:p>","DOI":"10.1002\/mdc3.12139","type":"journal-article","created":{"date-parts":[[2015,3,16]],"date-time":"2015-03-16T06:03:14Z","timestamp":1426485794000},"page":"175-181","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":40,"title":["Validation of the Psychosis and Hallucinations Questionnaire in Non\u2010demented Patients with Parkinson's Disease"],"prefix":"10.1002","volume":"2","author":[{"given":"James M.","family":"Shine","sequence":"first","affiliation":[{"name":"Brain and Mind Research Institute University of Sydney Sydney New South Wales Australia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Joanna M.Z.","family":"Mills","sequence":"additional","affiliation":[{"name":"Brain and Mind Research Institute University of Sydney Sydney New South Wales Australia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jessica","family":"Qiu","sequence":"additional","affiliation":[{"name":"Brain and Mind Research Institute University of Sydney Sydney New South Wales Australia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Claire","family":"O'Callaghan","sequence":"additional","affiliation":[{"name":"Neuroscience Research Australia and University of New South Wales Sydney New South Wales Australia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Zoe","family":"Terpening","sequence":"additional","affiliation":[{"name":"Brain and Mind Research Institute University of Sydney Sydney New South Wales Australia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0422-8398","authenticated-orcid":false,"given":"Glenda M.","family":"Halliday","sequence":"additional","affiliation":[{"name":"Neuroscience Research Australia and University of New South Wales Sydney New South Wales Australia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Sharon L.","family":"Naismith","sequence":"additional","affiliation":[{"name":"Brain and Mind Research Institute University of Sydney Sydney New South Wales Australia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Simon J.G.","family":"Lewis","sequence":"additional","affiliation":[{"name":"Brain and Mind Research Institute University of Sydney Sydney New South Wales 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