Partial compensation to delayed auditory feedback: An analysis of syllable duration

Area of Science:

• Speech production and perception
• Auditory feedback processing
• Sensorimotor adaptation

Background:

• Previous studies show partial compensation for altered vocal feedback (pitch, intensity, spectral content).
• Compensation typically plateaus at 30%-40% of baseline, reflecting integrated auditory and somatosensory feedback.
• The study investigates if syllable duration exhibits similar partial compensation under delayed auditory feedback.

Purpose of the Study:

• To test the hypothesis that syllable duration compensation follows the partial pattern observed for other vocal parameters.
• To examine the effects of varying degrees of delayed auditory feedback on syllable duration.
• To differentiate compensation strategies between speech error types (prolongations vs. repetitions).

Main Methods:

• 21 young adults read a standard passage with auditory feedback delayed at intervals (0-600 ms).
• Average syllable duration was calculated for each delay condition.
• Speech errors were categorized as prolongations or repetitions to analyze durational effects.

Main Results:

• Syllable duration increased non-linearly with delay, peaking around 40% of baseline durations.
• Prolongations and distortions constituted 89% of perceived errors.
• Repetitions (9% of errors) showed full compensation (74%-110% of target duration).

Conclusions:

• Increasing syllable duration partially compensates for delayed auditory feedback, consistent with other altered auditory feedback responses.
• This partial compensation appears to be a general attribute of low-level sensorimotor adaptation.
• Prolongations are likely the primary compensation strategy for delayed auditory feedback, while repetitions may involve higher-level motor planning processes.