Speech Perception and Preparation Are Supported by Distinct Neural Dynamics Across Development

Area of Science:

• Neuroscience
• Developmental Psychology
• Speech Science

Background:

• Neural oscillations, particularly beta oscillations (13-30 Hz), are vital for precise timing and sensorimotor integration in speech.
• Beta oscillations support motor planning, attention, and anticipation, but their developmental trajectory in speech processing is not well understood.

Purpose of the Study:

• To investigate developmental differences in beta oscillation dynamics during speech perception and production.
• To compare beta power modulation in adults and children across different speech-related tasks.

Main Methods:

• Electroencephalography (EEG) was used to record brain activity in 28 adults and 50 children.
• Participants performed speech perception ('Hear') and production ('Say') tasks, alongside a control task ('See').
• Beta power changes were analyzed in three distinct time windows relative to task cues.

Main Results:

• Adults demonstrated significant beta power decreases across all time windows and conditions, indicative of mature integration.
• Children showed minimal beta reduction, with no significant condition-specific effects.
• Beta modulation in children was negatively correlated with age, suggesting ongoing neural maturation.

Conclusions:

• Significant developmental differences exist in beta oscillation dynamics during speech processing.
• These findings underscore the maturational changes in neural mechanisms supporting speech timing and sensorimotor control from childhood to adulthood.