Objectives Traditional excised larynx dissection and setup calls for the removal of all supraglottal structures, eliminating any source-filter interactions that measurably affect the acoustic properties of phonation. We introduce a simplified vocal tract model that can be used in excised larynx experiments and tested the nonlinear source-filter interactions that are present with the addition of highly-coupled, supraglottal structures. Methods Aerodynamic and acoustic data were measured at phonation threshold pressure (PTP) and +25% PTP in ten excised canine larynges using a modified dissection technique. PTP and phonation threshold flow (PTF) were defined as the pressure and flow at the phonation onset; phonation threshold power (PTW) is the product of these values. Data were recorded for four experimental conditions: PTP without vocal tract; +25% PTP without vocal tract; PTP with vocal tract; +25% PTP with vocal tract. Differences in PTP, PTF, and PTW were evaluated. For trials conducted at +25%PTP, differences in airflow were evaluated. Results PTP (p = 0.009) and PTW (p = 0.002) were significantly reduced with the addition of the novel vocal tract. A reduction in PTF was also present with the vocal tract (p = 0.021) but airflow was not significantly reduced in +25% PTP trials (p = 0.196). Conclusion The proposed vocal tract can be used with complete larynges when conducting excised larynx experiments. The effects of nonlinear source-filter interaction were observed during trials with the vocal tract, as evidenced by changes in threshold aerodynamic parameters.
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