Sound and postural control during stance tasks in abnormal subjective haptic vertical

Area of Science:

• Vestibular system function
• Sensory integration and balance
• Auditory and somatosensory interactions

Background:

• Vestibular impairment frequently leads to postural instability.
• The auditory system may offer compensatory sensory input for balance deficits.
• Abnormal subjective haptic vertical (SHV) is a specific indicator of vestibular dysfunction.

Purpose of the Study:

• To determine if auditory input enhances postural stability in individuals with abnormal SHV.
• To investigate the effects of different auditory conditions (quiet, noise, plugged ears) on balance.
• To compare postural control between individuals with abnormal SHV and a control group.

Main Methods:

• Thirteen participants with abnormal SHV and normal hearing/vision performed balance tasks.
• Tasks included standing on firm/foam surfaces and Tandem Romberg tests under various auditory conditions.
• Postural stability was measured, and data were compared to a control group.

Main Results:

• No significant difference in sway was observed between the study group and controls under reference conditions.
• Increased sway occurred in only two tasks when noise was introduced in the soundproofed room.
• Auditory stimulation did not consistently improve postural stability.

Conclusions:

• Auditory stimulation showed no benefit for posture in individuals with abnormal SHV in a reverberant room.
• Noise adversely affected balance during difficult tasks in a soundproofed setting.
• Noise may have hindered balance by masking auditory cues or causing distraction.