Oscillatory cortical activity during a motor task in a deafferented patient

Area of Science:

• Neuroscience
• Sensorimotor Integration
• Human Motor Control

Background:

• The role of afferent peripheral feedback in sensorimotor cortex activation remains largely unknown.
• Understanding this influence is crucial for comprehending motor control and rehabilitation strategies.

Purpose of the Study:

• To investigate the impact of deafferentation on sensorimotor cortex activation during a visuomotor task.
• To compare alpha and beta band task-related power decreases (TRPow) between a deafferented patient and healthy controls.

Main Methods:

• Electroencephalography (EEG) recorded from 58 scalp positions.
• Measurement of exerted force during a precision grip visuomotor task.
• Comparison of resting and task-related spectral power changes in alpha and beta bands between a deafferented patient and six healthy subjects.

Main Results:

• The deafferented patient exhibited significantly higher resting alpha band spectral power compared to controls.
• Larger decreases in alpha band TRPow were observed in the patient during the motor task.
• No significant differences in beta band TRPow were found between the patient and controls.

Conclusions:

• Chronic deafferentation leads to an altered functional alpha band network state in the sensorimotor cortex.
• This alteration may result in a more pronounced 'idling' state of the contralateral sensorimotor area.
• Findings highlight the critical role of peripheral feedback in modulating sensorimotor cortex activity.