Transcranial direct current stimulation influences repetitive bimanual force control and interlimb force coordination

Area of Science:

• Neuroscience
• Motor Control
• Rehabilitation

Background:

• Bimanual coordination is crucial for daily activities.
• Understanding non-invasive brain stimulation effects on motor control is important.

Purpose of the Study:

• To investigate the effect of bilateral transcranial direct current stimulation (tDCS) on repetitive bimanual force control and coordination.
• To assess if tDCS modulates motor dependency between hands.

Main Methods:

• A sham-controlled crossover study involving 18 healthy young adults.
• Participants performed repetitive bimanual handgrip force control tasks.
• Bilateral tDCS was applied to the primary motor cortex (M1).

Main Results:

• Bilateral tDCS significantly increased successful trials compared to sham.
• Active tDCS led to better force control and coordination (reduced variability and regularity, more negative correlation).
• Participants receiving tDCS showed increased force production from the dominant hand.

Conclusions:

• Bilateral tDCS on M1 enhances bimanual force control and coordination.
• tDCS modulates motor dependency, improving performance in repetitive bimanual tasks.