Efference copies refer to internal duplicates of movement-producing neural signals. Their
primary function is to predict, and often suppress, the sensory consequences of willed
movements. Efference copies have been almost exclusively investigated in the context of
overt movements. The current electrophysiological study employed a novel design to show
that inner speech–the silent production of words in one's mind–is also associated with an
efference copy. Participants produced an inner phoneme at a precisely specified time, at …