International association of logopedics and phoniatrics (IALP) voice committee discussion of assessment topics

Abstract

In my report I made two recommendations: that we call the vertical axis either vocal fold contact area or we call it conductance or something of that ilk. I agree with Dr. Titze that it is not possible to scale that vertical axis. There is unlikely to be a linear transform of the vocal fold contact area. I tend to support his recommendation that we not call it vocal fold contact area per se, although that term has appeared in the literature in the last several years. I do not know of a good alternative term. Conductance comes to mind for purely electronic reasons. If we call it impedance then we have to graph it upside down. Another important point is that we cannot discern a true zero line on the electroglottogram (EGG). We can make assumptions about the beginning of contact but the so-called open phase should be flat, in theory. In theory, therefore, we should be able to say that the lowest part of the curve represents zero vocal fold contact. The fact is that we are never absolutely sure of that. The flat portion is rarely actually flat. There may be some minor vocal fold contact, perhaps at the anterior commissure, that is influencing the curve. There is also the influence, which is small but real, of other events distant from the glottis. These are periglottal events that we really cannot account for. The thing that worries me Address correspondence and reprint requests to Diane M.

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