PLoS ONE 14(2):Įditor: Ifat Yasin, University College London, UNITED KINGDOM
These findings may be used alone or in conjunction with other measures such as fNIRS brain activity for evaluation of hearing ability.Ĭitation: Shoushtarian M, Weder S, Innes-Brown H, McKay CM (2019) Assessing hearing by measuring heartbeat: The effect of sound level. In conclusion, changes in heart rate were associated with the level of sound with a clear difference in response to near-threshold sounds compared to comfortably loud sounds. At other levels, the most significant change appeared later (beats 3 to 5 following sound onset). For sounds at 40 dB SPL, an immediate significant change in the first two inter-beat intervals following sound onset was found. To quantify the timing of significant changes, inter-beat intervals were assessed. For sounds at 65 and 90 dB SPL, increases in heart rate were seen. Following onset of the noise stimulus, heart rate initially decreased for sounds of 15 and 40 dB SPL, reaching a significantly lower rate at 15 dB SPL. Cardiac response measures evoked by broadband, amplitude-modulated sounds were extracted for four sound intensities ranging from near-threshold to comfortably loud levels (15, 40, 65 and 90 dB Sound Pressure Level (SPL)). fNIRS data were collected from 28 normal hearing participants. This study investigated whether cardiac responses collected using fNIRS differ for different loudness of sounds. Previous studies have shown changes in cardiac activity in response to different sounds. In addition to neural activity, fNIRS signals contain components that can be used to extract physiological information such as cardiac measures. Functional near-infrared spectroscopy (fNIRS) is a non-invasive brain imaging technique that measures changes in oxygenated and de-oxygenated hemoglobin concentration and can provide a measure of brain activity.
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