Abstract
An artificial palate implanted with a photoelectronic distance-sensing unit has been devised for tracking the continuous movement of the tongue surface during speech activities. A pair of narrow angle light source and photo sensor, imbedded in a 13.0x7.5x3.3 mm plastic base, has been studied experimentally in detecting the distance of a moving object by sensing the reflected light; this method has proved to be particularly effective when the object reflects with a nonsmooth surface. By arranging from four to seven units of this device along the midsagittal line of the hard palate, a real time displacement of the tongue surface can be reconstructed and displayed on the CRT. A preliminary device has been used to study the coarticulation between various consonants /p, t, k, l, n/ and vowels /i, e, a, o, u/. We have checked our data against earlier reports on coarticulation based on x-ray studies (Perkell). While the two types of results are comparable, the new device is simple in construction and allows the experiments to be free from the hazards of x-ray exposure. [Work supported by NSF, grant no. SOC-05798A01.]
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