Modifying electroglottograph-identified intervals of phonation: the effect on stuttering

Area of Science:

• Speech-language pathology
• Bioacoustics
• Neuroscience of speech disorders

Background:

• Stuttering is a complex speech disorder affecting fluency.
• Understanding the acoustic properties of speech in stuttering is crucial for developing interventions.
• Phonation intervals are key acoustic events in speech production.

Purpose of the Study:

• To investigate the effect of modifying phonation interval frequency on stuttering behavior.
• To assess the efficacy of a computer-assisted biofeedback system in controlling stuttering.
• To determine if intervention effects are independent of speaking rate and speech naturalness.

Main Methods:

• Single-subject experimental design with adolescent and adult male stutterers.
• Utilized an electroglottograph to measure phonation intervals.
• Employed a computer-assisted biofeedback system to modify phonation interval frequency during spontaneous speech.

Main Results:

• Both subjects demonstrated significant control over stuttering by modifying phonation interval frequency.
• The observed effects were independent of changes in speaking rate.
• Speech naturalness was minimally disrupted by the intervention.

Conclusions:

• Modifying the frequency of phonation intervals within specific durations is an effective method for stuttering control.
• This biofeedback approach offers a promising avenue for stuttering therapy.
• Findings support the role of precise control over laryngeal motor timing in fluent speech production.