Most of the previous studies have used electrogustometry
as the principal tool of investigation.
Before treatment, we performed the following examinations and recorded the clinical data: pure tone audiometry, stapedial reflex test, electrogustometry, brain magnetic resonance imaging, and past history.
 noted that the final degree of healing correlates well with the initial electromyogram, stapedial reflex test, and electrogustometry findings.
Stillman et al., Electrogustometry
: Strengths, Weaknesses,
Kawamoto and Ikeda studied the greater petrosal nerve function in BP/Ramsay Hunt syndrome patients by means of Schirmer's tear test and soft palate electrogustometry (EGM) ; in their study EGM appears to be a more sensitive method for testing the function of the GPN; the results of lacrimal function test were more closely related to the severity of and prognosis for facial paralysis than the results of EGM.
Ikeda, "Evaluation of greater petrosal nerve function in patients with acute peripheral facial paralysis: comparison of soft palate electrogustometry and schirmer's tear test," Acta Oto-Laryngologica, vol.
However, electrogustometry was not utilized as the authors feel that this technique has not been shown to correlate with the degree, type, or duration of taste disturbance.
Long-term follow-up results of electrogustometry and subjective taste disorder after middle ear surgery.
Studies with electrogustometry
on subjects in different age groups.