Hodko, Tajana.
(2014).
Changes of voice quality as a function of menstrual cycle.
Diploma Thesis. Filozofski fakultet u Zagrebu, Department of Psychology.
[mentor Hromatko, Ivana].
Abstract
The aim of this study was to determine whether variations in the acoustic characteristics of female voice occur as a function of hormonal changes between the late follicular and menstrual phase of the menstrual cycle. It was hypothesized that the acoustic voice parameters systematically vary through the cycle and provide information about the fertile phase. To this end, we conducted an acoustic voice analysis on the extended pronunciation of vowels / a / and the rate of speech in two neutral text. Participants also filled questionnaires regarding their mood, menstrual problems, mate value, gender roles and appraisal of voice. A total of 29 women with regular menstrual cycles participated in the study and were tested twice – in late follicular (high estrogen levels, low levels of progesterone) and menstrual (low estrogen levels, low levels of progesterone) phase of the menstrual cycle. Following acoustic characteristics voice were measured: fundamental frequency (F0), standard deviation of fundamental frequency (sdF0), F0 range, signal to noise ratio (HNR), jitter, shimmer and formant dispersion (Df). Contrary to our expectations, F0, F0 range, sdF0 and Df were lower in the late follicular phase of the menstrual cycle. Measures of jitter, shimmer, and signal to noise ratio did not vary significantly across the menstrual cycle. Neither did the rate of speech. We have found significant differences in some dimensions of mood and menstrual distress questionnaire but not in the voice assessment. Correlations between the Mate Value Inventory, Bem Sex Role Inventory and acoustic characteristics were not significant.…………………………………………………………..
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