Autonomic Arousal During Speech Production and Sensorimotor Adaptation

Area of Science:

• Speech motor control
• Autonomic nervous system
• Sensorimotor adaptation

Background:

• Autonomic arousal influences speech production, but its specific effects on motor control and adaptation remain unclear.
• Understanding these effects is crucial for comprehending speech physiology.

Purpose of the Study:

• To investigate the role of autonomic arousal in typical speech output and sensorimotor adaptation.
• To delineate how physiological arousal impacts lower-order speech production and higher-order adaptive mechanisms.

Main Methods:

• Two experiments were conducted with 30 adults, modulating cognitive load to induce autonomic arousal.
• Experiment 1 used Stroop stimuli during sentence production, measuring acoustic articulation metrics.
• Experiment 2 employed altered auditory feedback with Stroop words, assessing adaptive responses to feedback changes.

Main Results:

• Increased autonomic arousal correlated with decreased articulation (F2 slope) in Experiment 1.
• Higher autonomic arousal was linked to enhanced sensorimotor adaptation in Experiment 2.
• Cognitive load did not significantly impact acoustic metrics or adaptation.

Conclusions:

• Autonomic arousal influences both typical speech production and sensorimotor adaptation.
• The body's physiological state is a key factor in speech motor control and learning.