Sixth International Conference on Spoken Language Processing
October 16-20, 2000
Articulatory Compensation and Adaptation for Unexpected Palate Shape Perturbation
Masaaki Honda, Akinori Fujino
NTT Laboratories / CREST, JST, Japan
This paper describes compensatory articulatory behavior in response
to an unexpected perturbation of the oral cavity. An artificial
palate, whose thickness can be changed during speech,
was constructed to provide downward (increase of thickness)
and upward (decrease of thickness) perturbation on the palate
shape. The compensatory articulation during the utterance
of repeated syllables, which contain fricative /R / and stopfricative
/tR /, was recorded with an electromagnetic articulographic
system. An EMG recording of tongue muscles was
also made to examine the speech control mechanism of the
immediate compensation of the tongue. The compensatory behavior
was examined for both unmasked and masked audiofeedback
conditions. The immediate compensation of the
tongue to the unexpected perturbation occured within 100 ms
after the perturbation for both audio-feedback conditions. It
was, however, often incomplete and an overshoot of the tongue
caused speech errors in the first occurrence of the fricative.
The speech error disappeared and complete compensation was
achieved in the successive occurrence of the phoneme during
the same utterance. The time course in achieving the complete
compensation was dependent on the audio-feedback condition.
The masked audio-feedback condition needed a longer interval
for the complete compensation.
Honda, Masaaki / Fujino, Akinori (2000):
"Articulatory compensation and adaptation for unexpected palate shape perturbation",
In ICSLP-2000, vol.2, 170-173.