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Vocal capabilities battery:

–Limitation of the extent of upper notes compared to examiner or expected range

–Flatting and poor control in the upper vocal pitch range

Endoscopy:

–Vocal cord length changes minimally or not at all during attempted glide up in pitch

Stroboscopy:

–Symmetric oscillations at low pitch while asymmetry of vocal fold vibration at high pitch present because differential tension is most evident when only one cricothyroid muscle contracts

–At high pitch the injured (non-tense) cord oscillates lateral to its axis while the normal cord oscillates symmetrically about its axis

–At phonatory onset and offset the weak cord has a central glottic gap