Abstract
Lombard speech is an involuntary adaptive change in voicing under the influence of noise. In the current study we examine the relationship between involuntary auditory-speech control, common for Lombard speech, and voluntary control of phonation, which occurs as a result of the visual estimation of the distance to the listener (1 and 4 m). Fundamental frequencies (F0) were estimated in nine normally hearing Russian female speakers aged 20–35 years. An increase in F0 was obtained when the communicative conditions became more complex in both cases of an increase in surrounding background noise level and growth of talker-to-listener distance. In quiet and in noise of 60 and 72 dB the increase in talker-to-listener distance led to F0 increments of 14, 18, and 15 Hz, which did not differ significantly from each other (p > 0.05, n = 288). When the communicative distance was held constant, babble noise of different levels led to significantly different values of ΔF0: for 1 m distance–14 and 32 Hz (p < 0.001, n = 288), and for 4 m–18 and 33 Hz (p < 0.001, n = 288), respectively. The data obtained is evidence of the independent and additive impact of noise and communicative distance on phonation.
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This study was supported by the Russian Science Foundation (project no. 22-25-00068).
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All studies were carried out in accordance with the principles of biomedical ethics, formulated in the Declaration of Helsinki 1964 and its subsequent updates, And approved by the local ethics committee of the Institute of Evolutionary Physiology and Biochemistry (St. Petersburg).
Informed consent. Each participant in the study provided a voluntary written informed consent signed by him after explaining to him the potential risks and benefits, as well as the nature of the upcoming study.
Conflict of interest. The authors declare the absence of obvious and potential conflicts of interest related to the publication of this article.
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A.M. Lunichkin, I.G. Andreeva, and A.P. Gvozdeva—the idea of work and the planning of the experiment, A.P. Gvozdeva—preparation of the methodology, A.M. Lunichkin—data collection and processing, A.M. Lunichkin, I.G. Andreeva, and A.P. Gvozdev—writing and editing the manuscript.
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Lunichkin, A.M., Gvozdeva, A.P. & Andreeva, I.G. The Impact of Visual Estimates of Talker-to-Listener Distance on Fundamental Frequency in Noise. Hum Physiol 49, 281–288 (2023). https://doi.org/10.1134/S0362119723700226
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DOI: https://doi.org/10.1134/S0362119723700226