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Title: Cortical fNIRS Responses Can Be Better Explained by Loudness Percept than Sound Intensity
Authors: Weder, Stefan
Shoushtarian, Mehrnaz
Olivares, Virginia
Zhou, Xin
Innes-Brown, Hamish
McKay, Colette
Keywords: Cortical brain activation
Functional near-infrared specrtroscopy
Loudness perception
Sound intensity
Issue Date: Jan-2020
Publisher: Wolters Kluwer Health, Inc
Citation: Weder, S., M. Shoushtarian, V. Olivares, X. Zhou, H. Innes-Brown, and C. McKay. 2020. Cortical fNIRS Responses Can Be Better Explained by Loudness Percept than Sound Intensity. Ear and Hearing: [epub ahead of print].
Abstract: OBJECTIVES: Functional near-infrared spectroscopy (fNIRS) is a brain imaging technique particularly suitable for hearing studies. However, the nature of fNIRS responses to auditory stimuli presented at different stimulus intensities is not well understood. In this study, we investigated whether fNIRS response amplitude was better predicted by stimulus properties (intensity) or individually perceived attributes (loudness). DESIGN: Twenty-two young adults were included in this experimental study. Four different stimulus intensities of a broadband noise were used as stimuli. First, loudness estimates for each stimulus intensity were measured for each participant. Then, the 4 stimulation intensities were presented in counterbalanced order while recording hemoglobin saturation changes from cortical auditory brain areas. The fNIRS response was analyzed in a general linear model design, using 3 different regressors: a non-modulated, an intensity-modulated, and a loudness-modulated regressor. RESULTS: Higher intensity stimuli resulted in higher amplitude fNIRS responses. The relationship between stimulus intensity and fNIRS response amplitude was better explained using a regressor based on individually estimated loudness estimates compared with a regressor modulated by stimulus intensity alone. CONCLUSIONS: Brain activation in response to different stimulus intensities is more reliant upon individual loudness sensation than physical stimulus properties. Therefore, in measurements using different auditory stimulus intensities or subjective hearing parameters, loudness estimates should be examined when interpreting results.
URI: http://repository.bionicsinstitute.org:8080/handle/123456789/382
ISSN: 0196-0202
Appears in Collections:Bionic Hearing Research Publications

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