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However, proximal-arm motor tasks, such as at the shoulder, are uncommon during fMRI due to practical limitations, though they are critical to a complete understanding of upper-extremity motor control. Previous fMRI studies of proximal upper-extremity control have generally used unconstrained movements or a single low force or torque condition, leaving unknown how distributed supraspinal brain activity scales with increasing proximal motor output. Here, we implemented a custom, MR-safe device to test supraspinal brain activity during three levels of isometric shoulder abduction in healthy individuals using a whole-brain fMRI acquisition. We conducted subject-specific analysis with repeated sampling of the controlled shoulder abduction task within each individual (i.e., \u201cprecision mapping\u201d), as the exact localization of shoulder motor activity is relatively understudied. Our analysis showed spatial variability in subject-specific motor activation compared to group-level localization. We found that shoulder abduction had a significant effect on motor activity in the primary motor cortex, supplementary motor area, dorsal premotor area, thalamus, putamen, and cerebellum. Across repeated fMRI runs, amplitude of motor activity was consistent across all tested regions. Overall, these findings provide an individualized, whole-brain torque-response characterization of the proximal upper-extremity motor system and establish an approach for examining how distributed supraspinal motor networks are recruited as mechanical demand increases. These whole-brain, subject-specific methods can be a critical tool for probing motor dysfunction in clinical populations.<\/jats:p>","DOI":"10.64898\/2026.09.22.752784","type":"posted-content","created":{"date-parts":[[2026,9,28]],"date-time":"2026-09-28T23:05:13Z","timestamp":1790636713000},"source":"Crossref","is-referenced-by-count":0,"title":["Whole-brain precision functional mapping of a proximal upper-extremity motor task"],"prefix":"10.64898","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-8938-540X","authenticated-orcid":false,"given":"Neha A.","family":"Reddy","sequence":"first","affiliation":[{"name":"Department of Physical Therapy and Human Movement Sciences, Feinberg School of Medicine, Northwestern University, Chicago, IL, United States"},{"name":"Department of Biomedical Engineering, McCormick School of Engineering and Applied Sciences, Northwestern University, Evanston, IL, United States"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0005-3862-5596","authenticated-orcid":false,"given":"Michelle C.","family":"Medina","sequence":"additional","affiliation":[{"name":"Department of Physical Therapy and Human Movement Sciences, Feinberg School of Medicine, Northwestern University, Chicago, IL, United States"},{"name":"Department of Biomedical Engineering, McCormick School of Engineering and Applied Sciences, Northwestern University, Evanston, IL, United States"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8786-0542","authenticated-orcid":false,"given":"Ana Maria","family":"Acosta","sequence":"additional","affiliation":[{"name":"Department of Physical Therapy and Human Movement Sciences, Feinberg School of Medicine, Northwestern University, Chicago, IL, United States"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ahalya","family":"Mandana","sequence":"additional","affiliation":[{"name":"Department of Physical Therapy and Human Movement Sciences, Feinberg School of Medicine, Northwestern University, Chicago, IL, United States"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0641-8400","authenticated-orcid":false,"given":"Julius P. 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