Stabilometric signal analysis in tests with sound stimuli

Area of Science:

• Neuroscience
• Biomechanics
• Auditory Science

Background:

• Posture control integrates sensory information from visual, somatosensory, and vestibular systems.
• Stabilometric signals objectively measure body sway and stability.
• Limited research explores the direct impact of vestibular stimulation on stabilometric data due to stimulation challenges.

Purpose of the Study:

• To investigate the relationship between stabilometric signals and vestibular stimulation.
• To assess the effect of high-intensity sounds on posture control.
• To explore sound as a method for perturbing the vestibular system.

Main Methods:

• Sixty-six volunteers stood on a force platform under various sound stimulation conditions (pure tones, clicks, bursts).
• Stabilometric variables (position, standard deviation, velocity, displacement, frequency, sway area) were recorded in lateral and anterior-posterior directions.
• Data were analyzed using Analysis of Variance (ANOVA) and Wilcoxon test.

Main Results:

• The visual system significantly influenced the mean velocity of the center of pressure.
• No statistically significant differences in stabilometric signals were found between sound stimulation and no-stimulation conditions.
• Visual inspection revealed consistent patterns in displacement and standard deviation during post-stimulation recovery, though not always statistically significant.

Conclusions:

• The specific sound stimuli used did not consistently affect stabilometric balance signals.
• The visual system plays a crucial role in maintaining balance.
• Future studies should explore higher sound intensities and alternative stimuli to elicit measurable vestibular effects on balance.