Oscillatory motor network activity during rest and movement: an fNIRS study

Area of Science:

• Neuroscience
• Systems Neuroscience
• Brain Imaging

Background:

• Coherent low-frequency brain oscillations link distributed regions during rest and tasks.
• Understanding dynamic network changes from rest to task is crucial.
• Sensorimotor network dynamics during motor tasks require further investigation.

Purpose of the Study:

• To investigate network oscillations in sensorimotor regions during rest and finger movements.
• To examine changes in connectivity strength, frequency, and direction.
• To assess the utility of functional near-infrared spectroscopy (fNIRS) for monitoring brain activity.

Main Methods:

• Used fNIRS to measure hemodynamic activity in able-bodied individuals.
• Applied spectral interdependency methods to analyze connectivity.
• Examined the supplementary motor area (SMA), left premotor cortex (LPMC), and left primary motor cortex (LM1).
• Studied resting state (RS), between-tasks resting state (btRS), and finger movement tasks (LH, RH, BH).

Main Results:

• Oscillatory peaks shifted from 0.01-0.04 Hz (RS) to 0.04-0.08 Hz (btRS and tasks).
• Connectivity was bidirectional during RS, becoming unidirectional (LM1 to SMA/LPMC) during btRS.
• Movement tasks modulated SMA-LM1 and LPMC-LM1 connections, with unidirectional SMA-LM1 changing to bidirectional during LH/BH tasks.

Conclusions:

• fNIRS effectively monitors spectral signatures of brain activity.
• Dynamic network changes reflect distinct cognitive processes (e.g., preparation, execution).
• Findings may inform monitoring of recovery post-brain injury.