Glottal area variations: A comparison between transillumination and high-speed filming
Thomas E. Baer, Anders Löfqvist, Nancy S. McGarr · The Journal of the Acoustical Society of America · 1981
Transillumination as a tool for studying laryngeal behavior in speech has been in use for considerable time, but it has not been extensively compared with other techniques for obtaining information on laryngeal vibrations. Two studies, comparing area variations obtained by transillumination and high-speed filming, reported conflicting results concerning the reliability of transillumination. The present experiment was designed to further explore the information that can be obtained by transillumination. Simultaneous transillumination signals and high-speed films of the glottis were obtained from three subjects producing steady phonation and pitch changes. Measurements of glottal opening were made at three different points along the glottis in the anterior-posterior dimension. Preliminary results indicate that transillumination reliably shows the timing of glottal opening and closing movements during the vibratory cycle. [Work supported by NINCDS.]