Postural regulation and stability with acoustic input in normal-hearing subjects.

Area of Science:

• Neuroscience
• Biomechanics
• Auditory Science

Background:

• Postural regulation relies on intricate interactions between multiple sensory systems.
• The auditory system's role in maintaining balance is increasingly recognized.

Purpose of the Study:

• To quantify the impact of auditory input on postural control.
• To investigate the interplay between auditory stimuli and postural subsystems.
• To explore subjective perceptions of auditory influence on stability.

Main Methods:

• Utilized the Interactive Balance System (IBS) to measure postural regulation in 30 healthy participants.
• Assessed postural control under conditions with and without auditory noise.
• Employed frequency-oriented fast-Fourier analysis to examine postural subsystems at the process level and overall stability at the product level.

Main Results:

• Auditory noise significantly impaired postural regulation in specific frequency bands associated with visual, nigrostriatal, and peripheral vestibular systems.
• The weight distribution index (WDI) increased significantly with auditory noise.
• No significant changes were observed in the stability indicator (ST) parameter, indicating preserved overall postural stability.

Conclusions:

• Auditory input induces a measurable shift in the activity of key postural subsystems.
• Despite changes in subsystem activity and weight distribution, overall postural stability (ST) was not compromised.
• Findings provide novel insights into the complex mechanisms governing audiovestibular interaction in postural control.