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When we hear a sound, our nervous system is detecting sound waves—pressure waves of mechanical energy traveling through a medium. The frequency of the wave is perceived as pitch, while the amplitude is perceived as loudness.
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Related Experiment Video

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Data Acquisition and Analysis In Brainstem Evoked Response Audiometry In Mice
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Head hemodynamics and systemic responses during auditory stimulation.

Vanesa Muñoz1, José A Diaz-Sanchez1, Manuel Muñoz-Caracuel1

  • 1Human Psychobiology Laboratory, Experimental Psychology Department, University of Sevilla, Sevilla, Spain.

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|July 5, 2022
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Summary

High-intensity auditory stimuli trigger complex systemic responses, affecting heart rate, blood flow, and brain oxygenation. This study reveals potential sympathetic nervous system involvement in regulating vascular tone and cephalic blood flow during intense sound exposure.

Keywords:
auditory stimulationelectrodermal activityfNIRSheart ratepulse signalpulse transit time

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Area of Science:

  • Neuroscience
  • Cardiovascular Physiology
  • Auditory Science

Background:

  • The autonomic nervous system (ANS) plays a crucial role in regulating physiological responses to external stimuli.
  • Understanding the ANS's influence on cephalic blood flow during auditory stimulation is essential for comprehending brain-body interactions.
  • Auditory stimuli, particularly at varying intensities, can elicit complex physiological reactions that warrant detailed investigation.

Purpose of the Study:

  • To analyze the systemic physiological response to auditory stimulation across a range of intensities.
  • To investigate the influence of the autonomic nervous system on cephalic and peripheral hemodynamic responses.
  • To explore the relationship between auditory intensity and autonomic and cardiovascular markers.

Main Methods:

  • Twenty-five subjects were exposed to auditory stimuli at five different intensities (70.9–94.5 dBA).
  • Simultaneous recording of electrodermal activity (EDA), photoplethysmography (PPG), electrocardiogram (ECG), and functional near-infrared spectroscopy (fNIRS).
  • Analysis of peripheral signals (heart rate, pulse transit time) and central hemodynamic changes (hemoglobin concentrations in the auditory cortex).

Main Results:

  • A distinct physiological response was observed at the highest intensity (94.5 dBA), including decreased heart rate, pulse signal, and pulse transit time.
  • Increased LFnu power in PPG and decreased oxygenated and total hemoglobin concentration at the head level were noted at high intensities.
  • Reduced deoxyhemoglobin in the auditory cortex suggested an active neural response, while EDA and heart rate variability showed no significant intensity-dependent changes.

Conclusions:

  • High-intensity auditory stimuli elicit a complex, systemic physiological response involving both peripheral and cephalic hemodynamic changes.
  • The observed decrease in pulse transit time and increase in LFnu power suggest sympathetic-mediated vasoconstriction, potentially impacting cerebral blood flow.
  • While some autonomic measures remained unchanged, the findings indicate a significant ANS influence on vascular tone and brain oxygenation under intense auditory conditions.