A technology that detects the degree of closure or opening of the vocal folds by measuring the electrical resistance between two electrodes placed on either side of the neck. EGG can give good information about degree of compression of one vocal fold against the other. It provides a waveform that represents the closed and open phases of vocal fold movement. At present, the value of EGG and the measures generated from this technology may be viewed differently in different institutions/clinics. At BVI, we believe that these measures offer little to the typical clinical needs of the diagnostic process, but may be of interest to those doing voice research and of help in voice therapy.