Compensatory Response to Unexpected Jaw Perturbation Triggered by Formant Transitions During Speech
msra
摘要
Observations were made of jaw and formant trajectories during speech perturbed by unexpected mechanical loads applied to the jaw. The perturbation forces were applied using a jaw-coupled robot, and triggered by a thresholding criterion applied to realtime tracking of the first formant. Subjects produced multiple repetitions of real word utterances containing either high-to-mid or low-to-mid vowel sequences. Perturbations were delivered one out of every five repetitions, selected at random, with half applied upward and half downward, and forces sustained throughout the target utterance. Audio and jaw position were recorded concurrently. Individual tokens were subsequently extracted using the F1 triggering threshold for alignment. Formants show initial deviation from control trajectories and then recovery that begins approximately 75 ms after the onset of perturbation. Compensation in most instances is nearly complete even though jaw position does not recover its unperturbed trajectory, and is thus presumably effected through appropriately modified tongue movements. This behavior is compatible with feedforward models of speech motor planning, in which corrective motor commands are computed in response to errors between anticipated and produced sensory consequences.
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