Stroboscopy Parameters

glottal closure

appearance of glottis during the most closed portion of glottal cycle

amplitude

magnitude of lateral movement of VFs

mucosal wave

magnitude of mucous membrane

non-vibrating pattern

adynamic segments of tissue that appear stiff

supraglottic activity

constriction of supraglottic structures

vertical level

do vocal folds meet on a plane?

free edge contour

smoothness or straightness of VFs

phase closure

relative duration at appearance of consecutive glottal closure cycles

phase symmetry

degree to which VFs move as mirror opposite images of each other (180 degrees)

regularity

consistency of cycles