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Abstract:
This paper describes compensatory articulatory behavior to the
structural perturbation of the oral cavity and focuses on the
immediate compensation with respect to an unexpected perturbation
and its short-term adaptation with and without audio feedback.
For implementing the unexpected perturbation, an artificial
palate whose thickness can be changed during speech, was
constructed.
The compensatory articulatory behavior of the jaw, lips and
tongue was recorded with an electro-magnetic articulographic
system. An immediate compensation of the tongue to the unexpected
perturbation in producing the fricative consonants was observed,
although it was incomplete and the overshoot effect often caused
speech errors, where fricative consonants /s, sh/ were
misidentified as the stop consonants /t, ch/. After a few
speaking trials with successive perturbations of the palate
shape, the compensation rapidly developed for both normal and
masked audio conditions.
The adaptation process of the articulatory compensation was of
an error-based correction type. After the adaptation period of 15
minutes, the articulatory compensation in the alveolar region was
noticeable in the tongue tip and blade positions but was not
noticeable in the jaw and the lip positions.
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