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Updated: May 31, 2026

Stimulus-specific Cortical Visual Evoked Potential Morphological Patterns
Published on: May 12, 2019
Validity of jitter measures in non-quasi-periodic voices. Part I: perceptual and computer performances in cycle
Philippe Dejonckere1, Jean Schoentgen, Andrea Giordano
1Catholic University of Leuven, Neurosciences, Exp. ORL, Belgium. Ph.deJonckere@umcutrecht.nl
Abstract:
The limit of about 5% for reliable quantification of jitter in sustained vowels of dysphonic voices-a widely accepted guideline-deserves critical analysis. The present study pertains to the effect of experience and training on the perceptual (visual) capability of correctly identifying periods in (highly) perturbed signals, and to a comparison of the performance of several programs for voice analysis. Synthesized realistic vowels (/a:/) with exactly known jitter (2.7%-31.5%) are used as material. After selection and training, experienced raters demonstrate excellent agreement in correctly identifying periods up to high values of jitter put in. Perceptual rating outperforms all computer programs in accuracy. Most remain reliable up to 10% jitter; one of them correctly measures up to the highest level.
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