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Although Parkinson disease (PD) causes profound balance impairments, we know very little about how PD impacts the sensorimotor networks we rely on for automatically maintaining balance control. In young healthy people and animals, muscles are activated in a precise temporal and spatial organization when the center of body mass (CoM) is unexpectedly moved. This organization is largely automatic and determined by feedback of CoM motion. Here, we show that PD alters the sensitivity of thedoi:10.1101/2020.01.27.921379 fatcat:fggm7jfnejci5ln7ouh42ojujq