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We introduce PIGDAssess, the first wearable system that enables fully self-administered at-home estimation of all four UPDRS-PIGD subitems, including postural stability, without clinician involvement. Patients wear three commodity IMUs (lumbar and both feet) and perform brief sit-to-stand, standing, and walking tasks under both single-task and dual-task (serial\u20133 subtraction) conditions. To robustly infer clinically meaningful scores from dual-task movement segments, we introduce three key modules: (1) a paired single\/dual-task encoder that captures balance-sensitive signatures; (2) a multi-action, multi-task fusion module that jointly predicts all four PIGD subscores from one short protocol; and (3) a prior-guided adaptation stage that reduces subject-to-subject variability while preserving the ordinal 0-3 clinical severity structure. We evaluate PIGDAssess on data from 35 individuals with PD, which were collected in collaboration with a partner hospital in both clinical settings and patients' homes, and were annotated with clinician-scored UPDRS-PIGD labels. Averaged across all four PIGD subitems, the system achieves 0.83 accuracy, 0.87 macro-F1, and 0.25 MAE. For Postural Stability, which normally requires a hands-on pull test, PIGDAssess reaches 0.89 accuracy using only three IMUs in a self-administered protocol. These results suggest a path toward frequent, low-burden, clinician-free PD assessment at home. We further conducted structured interviews with four neurologists, supporting the clinical usefulness and deployment feasibility of PIGDAssess. We have released the first IMU dataset with item-level UPDRS-PIGD annotations to enable reproducible benchmarking and accelerate clinical translation.<\/jats:p>","DOI":"10.1145\/3810193","type":"journal-article","created":{"date-parts":[[2026,6,15]],"date-time":"2026-06-15T17:06:41Z","timestamp":1781543201000},"page":"1-31","update-policy":"https:\/\/doi.org\/10.1145\/crossmark-policy","source":"Crossref","is-referenced-by-count":0,"title":["PIGDAssess: Wearable Dual-Task Sensing for Self-Administered PIGD Assessment in Parkinson's Disease"],"prefix":"10.1145","volume":"10","author":[{"ORCID":"https:\/\/orcid.org\/0009-0005-7530-9621","authenticated-orcid":false,"given":"Yizhen","family":"Zhang","sequence":"first","affiliation":[{"name":"Computer Science and Engineering, HKUST, Hong Kong, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0006-6741-9676","authenticated-orcid":false,"given":"Jinjian","family":"Wang","sequence":"additional","affiliation":[{"name":"Computer Science and Engineering, HKUST, Hong Kong, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7858-4419","authenticated-orcid":false,"given":"Wentao","family":"Xie","sequence":"additional","affiliation":[{"name":"Department of Computer Science and Engineering, The Hong Kong University of Science and Technology, Hong Kong, Hong Kong"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8719-7816","authenticated-orcid":false,"given":"Qingyong","family":"Hu","sequence":"additional","affiliation":[{"name":"Computer Science and Engineering, HKUST, Hong Kong, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4862-5619","authenticated-orcid":false,"given":"Haiyan","family":"Hu","sequence":"additional","affiliation":[{"name":"Computer Science and Engineering, HKUST, Hong Kong, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0149-7528","authenticated-orcid":false,"given":"Guihua","family":"Li","sequence":"additional","affiliation":[{"name":"Department of Neurology, Jinan University Affiliated Guangdong Second Provincial General Hospital, Guangzhou, China and The second Clinical College of Southern Medical University, Guangzhou, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9205-1881","authenticated-orcid":false,"given":"Qian","family":"Zhang","sequence":"additional","affiliation":[{"name":"Computer Science and Engineering, HKUST, Hong Kong, Hong Kong"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"320","published-online":{"date-parts":[[2026,6,15]]},"reference":[{"key":"e_1_2_2_1_1","doi-asserted-by":"crossref","first-page":"e00354","DOI":"10.1016\/j.neurot.2024.e00354","article-title":"Unraveling the threads of stability: A review of the neurophysiology of postural control in Parkinson's disease","volume":"21","author":"Bath Jessica E","year":"2024","unstructured":"Jessica E Bath and Doris D Wang. 2024. 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