Arm Motor Control on Bi and Uni ADLs

This study is being performed to assess how certain chronic disabilities - stroke, upper extremity (UE) amputation, spinal cord injuries (SCI), cerebral palsy (CP) - differ from healthy subjects in their ability to perform ADLs. By studying the kinematics of the respective cohort of study participants as they are assessed performing common activities of daily living (ADLS), the investigators research team aims to better understand how impaired neural pathways, and pathways that have been impaired at various points along the pathway, deleteriously affect ADLs in patients with differing long-term disabilities.

Inclusion Criteria: Study will include subjects 18 years of age or older from any of the below groups: * Stroke survivors, 3 months post event * Upper extremity amputees, 3 months post event * Cervical SCI (C-5 to C-7), 3 months post event * Cerebral palsy participants * Healthy participants Exclusion Criteria: * The inability to perform at least some aspects of ADL tasks such as drinking, pouring, pinching, and grasping. * Severe spasticity