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This study aimed to identify functional connectivity differences associated with visual hallucinations in early Parkinson's disease and to validate these findings across independent datasets. Resting-state functional MRI data from two independent studies were used: the \u2018Parkinson's Progression Markers Initiative\u2019 dataset was used as a discovery cohort (N = 25 hallucinators, N = 56 non-hallucinators) and the \u2018Incidence of Cognitive Impairments in Cohorts with Longitudinal Evaluation\u2019 dataset as replication (N = 49 hallucinators, N = 55 non-hallucinators overall). Group differences in functional connectivity were assessed within predefined cytoarchitectonic cortical classes and functional networks, followed by whole-brain analysis using Network-Based Statistics. This method identified a subnetwork of reduced functional connectivity in hallucinators, connecting regions involved in the default mode, somatomotor and attentional networks. Associations with clinical measures\u2014including hallucination severity, motor symptoms, cognition and attention\u2014were evaluated. Reduced functional connectivity in hallucinators was significantly associated with baseline and future motor symptoms, cognition and attention in the main cohort and with hallucination severity in the independent cohort. The identified functional subnetwork offers a potential direction for future research on Parkinson's disease psychosis.<\/jats:p>","DOI":"10.1093\/braincomms\/fcaf185","type":"journal-article","created":{"date-parts":[[2025,5,14]],"date-time":"2025-05-14T08:15:43Z","timestamp":1747210543000},"source":"Crossref","is-referenced-by-count":0,"title":["Disrupted functional brain network associated with presence of hallucinations in Parkinson\u2019s disease"],"prefix":"10.1093","volume":"7","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-5467-0104","authenticated-orcid":false,"given":"Marcella","family":"Montagnese","sequence":"first","affiliation":[{"name":"Department of Clinical Neurosciences, University of Cambridge , Cambridge CB2 0SZ ,","place":["UK"]},{"name":"Department of Neuroimaging, Institute of Psychiatry, Psychology & Neuroscience, King\u2019s College London , London SE5 8AF ,","place":["UK"]}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Mitul A","family":"Mehta","sequence":"additional","affiliation":[{"name":"Department of Neuroimaging, Institute of Psychiatry, Psychology & Neuroscience, King\u2019s College London , London SE5 8AF ,","place":["UK"]}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Dominic","family":"ffytche","sequence":"additional","affiliation":[{"name":"Department of Old Age Psychiatry, Institute of Psychiatry, Psychology & Neuroscience, King\u2019s College London , London SE5 8AB ,","place":["UK"]}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9536-0185","authenticated-orcid":false,"given":"Michael","family":"Firbank","sequence":"additional","affiliation":[{"name":"Translational and Clinical Research Institute, Newcastle University , Newcastle Upon Tyne NE1 7RU ,","place":["UK"]}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Rachael A","family":"Lawson","sequence":"additional","affiliation":[{"name":"Translational and Clinical Research Institute, Newcastle University , Newcastle Upon Tyne NE1 7RU ,","place":["UK"]}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"John-Paul","family":"Taylor","sequence":"additional","affiliation":[{"name":"Translational and Clinical Research Institute, Newcastle University , Newcastle Upon Tyne NE1 7RU ,","place":["UK"]}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Edward T","family":"Bullmore","sequence":"additional","affiliation":[{"name":"Department of Psychiatry, University of Cambridge , Cambridge CB2 0SZ ,","place":["UK"]}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Sarah E","family":"Morgan","sequence":"additional","affiliation":[{"name":"Department of Psychiatry, University of Cambridge , Cambridge CB2 0SZ ,","place":["UK"]},{"name":"Department of Computer Science and Technology, University of Cambridge , Cambridge CB3 0FD ,","place":["UK"]},{"name":"School of Biomedical Engineering and Imaging Sciences, King\u2019s 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