Abstract
During pharyngeal phase of swallowing, related muscles work together to produce wave-like contractions and to move food into esophageal phase. How the peristaltic contraction of muscles and movement of bolus coordinate can significantly strengthen or weaken one’s swallowing functions. This study uses the spectral moment analysis to investigate the acoustic effects of the peristaltic contraction wave during pharyngeal phase of swallowing. Four spectral moments describe features of the energy spectrum: the first moment (mean, centre of gravity) and the second moment (standard deviation) represent the spectrum's central tendency and dispersion respectively. Skewness and kurtosis (moment 3 and 4 ) represent spectrum's tilt and peak in relation to the central tendency. Results indicate that spectral moment measures may be one acoustic index sensitive to peristaltic contraction properties of swallowing. The statistical interpretation in accord with swallowing evaluation will be discussed.
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