Movement-related phase locking in the delta-theta frequency band

Area of Science:

• Neuroscience
• Motor Control
• Brain-Computer Interfaces

Background:

• Human movement arises from intricate interactions among diverse brain regions, forming functional networks specific to action types.
• The precise dynamics and assembly processes of these neural networks during motor control remain poorly understood.
• Identifying universal neural markers for motor preparation and execution is crucial for understanding voluntary actions.

Purpose of the Study:

• To identify key neural process markers common to motor action preparation and execution, irrespective of movement initiation differences.
• To investigate the specific neural processes and functional networks involved in motor control across cued and self-initiated movements.

Main Methods:

• Electroencephalography (EEG) data were recorded from 18 healthy participants performing cued and self-initiated button presses.
• Time-frequency and phase locking analyses were applied to EEG signals to identify common dynamic properties.
• Analysis focused on identifying movement-related neural signals independent of initiation method.

Main Results:

• A significant phase locking effect in the delta-theta (2-7Hz) frequency band was observed prior to movement onset in both conditions.
• This phase locking was strongest near the contralateral motor cortex (M1) and was not reflected in power spectra or event-related potentials.
• The identified phase locking represents a ubiquitous, movement-related signal independent of movement initiation.

Conclusions:

• Phase locking in the delta-theta frequency band serves as a universal neural signal for motor preparation and execution.
• This phase-locked neural oscillation in the motor cortex is suggested to be a prerequisite for initiating and performing motor actions.
• Findings advance our understanding of the fundamental neural mechanisms underlying voluntary movement control.