title: [Microperturbation of vocal cord vibrations, jitter and shimmer].
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.
authors.affiliation: Otorhinolaryngologie, K.U. Leuven.
authors.forename: F
authors.initials: F
authors.lastname: Debruyne
mesh_terms: D000328:Adult; D000368:Aged; D000375:Aging / Q000502:physiology; D006801:Humans; D008875:Middle Aged; D010699:Phonation; D012016:Reference Values; D014832:Voice Disorders / Q000503:physiopathology*; D014833:Voice Quality / Q000502:physiology
vernacular_title: Microperturbatie van de stembandtrillingen: jitter en shimmer.