Neural entrainment underpins sensorimotor synchronization to dynamic rhythmic stimuli

Area of Science:

• Neuroscience
• Cognitive Science
• Electrophysiology

Background:

• Neural entrainment, the synchronization of brain oscillations to external rhythms, is crucial for sensory and motor functions.
• Quantifying neural entrainment with non-invasive electrophysiology remains challenging due to limitations in current methods.
• Existing techniques struggle to capture the dynamic nature of neural entrainment.

Purpose of the Study:

• To introduce event-related frequency adjustment (ERFA), a novel framework for inducing and measuring neural entrainment.
• To optimize ERFA for multivariate electroencephalography (EEG) datasets in human participants.
• To analyze adaptive frequency changes in neural oscillations during error correction in a sensorimotor task.

Main Methods:

• Utilized dynamic phase and tempo perturbations of auditory metronomes during a finger-tapping task.
• Applied spatial filter design to isolate perceptual and sensorimotor oscillatory components from EEG data.
• Employed source separation techniques to analyze the entrained oscillatory dynamics.

Main Results:

• Both perceptual and sensorimotor oscillatory components dynamically adjusted their instantaneous frequency to track stimulus changes.
• Sensorimotor processing significantly enhanced the neural entrainment response, highlighting the role of motor engagement.
• Motor engagement was essential for entrainment to phase shifts, while tempo changes also affected perceptual oscillations.
• A bias towards positive frequency adjustments suggests intrinsic neural dynamics constrain entrainment.

Conclusions:

• ERFA provides a robust method for quantifying the dynamic oscillatory mechanisms of neural entrainment using non-invasive EEG.
• The findings confirm neural entrainment as a key mechanism underlying overt sensorimotor synchronization.
• This methodology offers a new paradigm for studying neural dynamics informed by the core definition of entrainment.