Speech Amplification Device Usage in Hypophonia: Spontaneous Speech Intelligibility.

Area of Science:

• Speech-Language Pathology
• Neurology
• Biomedical Engineering

Background:

• Hypophonia, characterized by reduced speech volume, is a common symptom in Parkinson's disease and parkinsonism.
• This communication impairment significantly impacts the quality of life for affected individuals.
• Effective management strategies for hypophonia are crucial for improving patient outcomes.

Purpose of the Study:

• To assess the efficacy of three distinct speech amplification devices in enhancing spontaneous speech intelligibility.
• To investigate the impact of these devices under varying noise conditions.
• To compare the performance of different amplification systems for individuals with hypophonia.

Main Methods:

• Twenty-one participants with hypophonia produced spontaneous speech in quiet and noisy environments (65-dB multitalker noise).
• Speech intelligibility was evaluated with four conditions: no device, portable wired amplifier, wireless stationary amplifier, and personal communication system.
• Listeners included familiar communication partners and naive listeners.

Main Results:

• All tested speech amplification devices improved spontaneous speech intelligibility for both listener groups.
• The positive effects were more pronounced in noisy conditions and with longer speech utterances.
• The personal communication system yielded the highest intelligibility, while the portable wired amplifier showed the lowest.

Conclusions:

• Speech amplification devices offer measurable benefits for spontaneous speech intelligibility in hypophonia.
• These findings reinforce the potential of speech amplification as a therapeutic tool for managing hypophonia.
• The study contributes to the evidence base for utilizing amplification technologies in Parkinson's disease speech therapy.