Extended Data Fig. 6: Neural modulation during question intonation.

Trial-averaged normalized spike-band power (each row in a group is one electrode) during trials where the participant modulated his intonation to say the cued sentence as a question. Trials with the same cue sentence (n=16) were aligned using dynamic time warping and the mean activity across trials spoken as statements was subtracted to better show the increased neural activity around the intonation-modulation at the end of the sentence. The onset of the word that was pitch-modulated in closed-loop is indicated by the arrowhead at the bottom of each example.