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A total of 79 participants, comprising 28 patients with isolated cerebellar stroke, 27 patients with isolated cerebral stroke and 24 healthy controls, performed Poggendorff illusion tasks and 2 different control tasks. We also investigated core brain regions underpinning changes in the experience of the illusion effect using multivariate lesion-symptom mapping. Our results indicate that patients with isolated cerebellar stroke were significantly less likely to experience the Poggendorff illusion effect than patients with isolated cerebral stroke or healthy controls (74.6, 90.5 and 89.8%, respectively; F(2,76) = 6.675, P = 0.002). However, there were no inter-group differences in the control tasks. Lesion-symptom mapping analysis revealed that the brain lesions associated with the reduced frequency of the Poggendorff illusion effect were mainly centred on the right posteromedial cerebellar region, including the right lobules VI, VII, VIII, IX and Crus II. Our findings demonstrated, for the first time, that patients with cerebellar damage were significantly less likely to experience the Poggendorff illusion effect and that right posteromedial cerebellar lesions played an important role in this effect. These results provide new insight into alterations of a geometric illusion effect in patients with cerebellar disorders and pave the way for future clinical use of the illusion task to detect cerebellar abnormalities.<\/jats:p>","DOI":"10.1093\/braincomms\/fcad053","type":"journal-article","created":{"date-parts":[[2023,3,7]],"date-time":"2023-03-07T13:58:21Z","timestamp":1678197501000},"source":"Crossref","is-referenced-by-count":0,"title":["Reduced likelihood of the Poggendorff illusion in cerebellar strokes: a clinical and neuroimaging study"],"prefix":"10.1093","volume":"5","author":[{"given":"Yuichi","family":"Higashiyama","sequence":"first","affiliation":[{"name":"Department of Neurology and Stroke Medicine, Graduate School of Medicine, Yokohama City University , Yokohama 236-0004 , Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Miho","family":"Kuroki","sequence":"additional","affiliation":[{"name":"Department of Neurology and Stroke Medicine, Graduate 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