A calibrated pressure transducer, embedded within a lower tongue clamp disk, enabled the application of specific tongue pressures during lingual threshold measurement. Thresholds were obtained for five tongue pressures (2, 5, 8, 11, and 14 PSIA) at three frequencies (125, 250, and 500 Hz). Thresholds varied as a function of tongue pressure. As pressure increased from 2 to 8 PSIA thresholds decreased. As pressure increased above 8 PSIA thresholds increased. Tongue pressure did not influence frequency function.
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