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  • Title: [Microperturbation of vocal cord vibrations, jitter and shimmer].
    Author: Debruyne F.
    Journal: Acta Otorhinolaryngol Belg; 1991; 45(4):431-6. PubMed ID: 1767676.
    Abstract:
    The cycle-to-cycle variability of the period duration (jitter) and the period amplitude (shimmer) are measures for the micro-instability of vocal fold vibrations. A short survey is presented of the definition of jitter and shimmer, a number of calculation methods, the normal values, and the effects of age and voice pathology.
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