by Benjamin Parrell, Minju Bae, Chris Naber, Olivia A. Kim, Caroline A. Niziolek, Samuel D. McDougle Observed outcomes of our movements sometimes differ from our expectations. These sensory prediction errors recalibrate the brain’s internal models for motor control, reflected in alterations to subsequent movements that counteract these errors (motor adaptation). While leading theories suggest that all forms of motor adaptation are driven by learning from sensory prediction errors, dominant models of speech adaptation argue that adaptation results from integrating time-advanced copies of corrective feedback commands into feedforward motor programs. Here, we tested these competing theories of speech adaptation by inducing planned, but not executed, speech. Human speakers were prompted to speak a word and, on a subset of trials, were rapidly cued to withhold the prompted speech. On standard trials, speakers were exposed to real-time playback of their own speech with an auditory perturbati