Ring sensors and phone app aim to boost arm use after stroke

Copied word for word from the study's registry entry, so the wording is the study team's rather than ours.

Inclusion Criteria: * Stroke survivor (ischemic or hemorrhagic), \>12 months post stroke, at the time of consent * Aged between 18 and 80 * Ability to extend ≥ 10° at the metacarpophalangeal joint and one of the interphalangeal joints of each finger, ≥ 10° extension or abduction of the thumb, and ≥ 20° extension of the wrist from a fully flexed starting position. * Demonstrating more affected arm nonuse, defined as a MAL-AoU score of \</= 4.5. * Actively uses at least one smartphone app. * Strong beliefs towards being in control of their recovery, indicated by a score of ≤ 10 points on the Internal Recovery Locus of Control (I-RLOC) Scale. * Participants must be able to read, write, and understand English at a level sufficient to comprehend study materials and provide informed consent. Exclusion Criteria: * Cognitive impairments that may affect the ability to understand and follow instructions (score \< 24 in the Mini Mental State Examination) * Difficulties comprehending numbers, dyslexia, severe aphasia, or other neurological conditions that prohibit the use of smartphones for safety reasons. * Undergoing other types of motor therapy during the study period. * Previous participation in constraint-induced movement therapy. * Currently participating in or has participated in the past 3 months in any experimental rehabilitation or drug studies. * Use of botulinum toxin for motor disability ≤ 3 months before treatment. * Significant changes in pharmacological or treatment plans during the study period that may affect upper-limb use. * Major medical problems that could interfere with participation. * History of a disabling stroke (i.e., need more than minimum assistance to perform ADLs). * Legally blind status. * Uncontrolled seizures. * Inability to don/doff sensors independently or with the assistance of a caregiver. * Implantable medical devices that do not comply with the ISO 14117:2012 and/or ANSI/AAMI PC69 standards for electromagnetic compatibility. Subjects will be asked to provide their medical device record card, and non-compliant devices will result in exclusion from the study.