Speech motor adaptation during synchronous and metronome-timed speech

Area of Science:

• Speech motor control
• Auditory-motor integration
• Acoustic-phonetics

Background:

• Sensorimotor integration is key to speech production.
• Previous adaptation studies used simple, solo speech tasks.
• Real-time voice perturbation reveals compensatory mechanisms.

Purpose of the Study:

• Investigate speech adaptation in sentence production.
• Compare adaptation in synchronous vs. solo speech.
• Examine acoustic-phonetic convergence and its relation to adaptation.

Main Methods:

• Real-time formant perturbation during sentence production.
• Synchronous speech group (n=30) vs. solo speech group (n=30).
• Experiment 2 used metronome-timed speech (n=15).

Main Results:

• No significant difference in average adaptation magnitude between groups.
• Synchronous speech showed increased between-individual variability.
• Acoustic-phonetic convergence preceded adaptation, correlating with its magnitude.

Conclusions:

• Speech motor adaptation is robust in complex tasks.
• Synchronous speech increases variability in adaptation.
• Further research needed on self-voice adaptation and other-voice convergence.