Re: Gaskill CS, Awan JA, Watts CR, Awan SN. Acoustic and perceptual classification of within-sample normal, intermittently dysphonic, and consistently dysphonic voice types. J Voice. 2016;31:218–228

The recently published study of Gaskill et al constitutes a remarkable contribution to the understanding of time-variance of dysphonic voice quality, because time-variance is often neglected in the description of voice quality. This circumstance may cause problems in clinical voice quality evaluation. We acknowledge the authors' contributions to clarify the different semantic levels of voice quality description, which are the speech level, the segmental level, the signal frame level, and the level of cycles.

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