Schematic of the experimental setup. ERPs were obtained in response to randomly chosen 0, 50, 100, 200 and 400 cents pitch shifts in subjects' voice auditory feedback. The voice signal was fed to a voice onset detector (VOD) module that was used to detect voice onset. The VOD output cued a random generator function to randomly choose a stimulus magnitude and trigger the harmonizer to deliver pitch shifts at voice onset.
Behroozmand and Larson BMC Neuroscience 2011 12:54 doi:10.1186/1471-2202-12-54