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Abstract:
Vocalic gestures are pervasive in the speech flow, carrying
consonantal coarticulated gestures, as framed by the famous
Ohman's model. Our present contribution will be that glides
were considered also as ubiquitous in the speech flow, appearing
naturally as the transitional (epenthetic) portions between vowel
"steady-state" phases. Consequently do they need a special
control status? From the phonological stance, it seems that it is
only when the transitional glide phase can be manipulated
linguistically, that a dynamic feature can be evidenced for and
by users of the specific language using such a control
(remembering that, like other epenthetic phenomenon, glides can
be recovered as true phonological controls). But what is relevant
from the control point of view - in production as in perception -
is that these transitional glides, like other epentheses, are not
ab initio programmed per se. They are kinematic by-products of a
controlled transition, typically from or onto a high vowel. Our
Two-Component Vowel Model delivers for free such by-products.
During the V-to-V transition there is a change from placing to
placing, i.e. in the targets of the carrier component which
locates the vowel along the vocal-tract. But there is not, during
this transition, a control of shaping, i.e. the second, carried
component, which morphs the sagittal and/or coronal VT-geometry.
Our claim is that glide emergence is a mere consequence of
asynchrony between placing and shaping. Consequently, if such an
emergence can be monitored afterwards in order to be
linguistically inhibited or enhanced, glides are not a priori
controlled in order to produce a dynamic perceptual effect.
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