Abstract
It has been well documented that sensory responses to self-produced speech/vocalization are suppressed when compared to the sounds that are produced externally. Some recent studies, however, reported enhancement effect for active vocalization relative to passive listening. The present study was to address whether speaking-induced cortical activation can be modulated by the physical features of the stimulus. Subjects sustained a vowel phonation and heard either their pitch-shifted voice (100 cents, or 500 cents) or a sum of their vocalization and pure tone or white noise during mid-utterance. During passive listening, subjects remained silent and listened to the playback of what they heard during active vocalization. Compared with passive listening, the results showed enhanced P2 responses for 100 cents condition whereas suppression effect for tone or noise condition. 500 cents condition elicited nothing but suppressed effect for N1 response. These findings suggest a stimulus-dependent modulation of vocalization-induced cortical activation, leading to enhancement or suppression effect relative to the play back of the vocalization. The results are discussed in relation to differential mechanisms underlying online mornitoring of auditory feedback at utterance onset and during mid-utternance.
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