從聲學與電聲門的角度探討老化對聲音穩定度之影響

This study examines the effect of aging and pitch height on vocal stability under perturbed auditory feedback. Aging voice in vowel prolongation is acoustically characterized by higher jitter, greater shimmer, and decreased harmonic-to-noise ratio, indicating that elderly adults have less stable and noisier voice than young adults. However, more accurate results of irregular vocal fold vibration could be obtained from electroglottograph (EGG), where two electrodes are placed on either side of the neck to capture transverse impedance during phonation. The EGG results show that elder females have greater vocal fold contact and F0 deviations than young females. Smaller contact quotient was found in the mid F0 voices, indicating vocalizing the mid pitch is less effortful.