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Is effect of transcranial direct current stimulation on visuomotor coordination dependent on task difficulty?
Yong Hyun Kwon1, Kyung Woo Kang2, Sung Min Son3
1Department of Physical Therapy, Yeungnam University College,170, Daemyung-dong, Namgu, Daegu, 705-703, Republic of Korea.
Neural Regeneration Research
|April 17, 2015
Summary
Transcranial direct current stimulation (tDCS) enhanced visuomotor coordination at moderate task difficulty. This non-invasive brain stimulation technique showed benefits for healthy subjects on specific tasks.
Area of Science:
- Neuroscience
- Motor Control
- Brain Stimulation
Background:
- Transcranial direct current stimulation (tDCS) is a non-invasive brain stimulation technique.
- tDCS is used to alter cortical excitability and modulate motor behavior, particularly in the upper limbs.
Purpose of the Study:
- To investigate the impact of primary motor cortex tDCS on visuomotor coordination.
- To assess these effects across three distinct levels of task difficulty in healthy individuals.
Main Methods:
- A single-blind, sham-controlled crossover study involving 38 healthy participants.
- Real tDCS (1 mA for 15 minutes) or sham tDCS applied to the primary motor cortex.
- Visuomotor tracking task performance assessed at three difficulty levels before and after stimulation.
Main Results:
- Real tDCS significantly improved the accuracy index at moderate task difficulty (level 2) compared to sham tDCS.
- No significant improvements in accuracy were observed at lower (level 1) or higher (level 3) task difficulties.
Conclusions:
- Primary motor cortex tDCS may enhance visuomotor coordination, but this effect appears dependent on task difficulty.
- Moderate difficulty tasks showed the most benefit from tDCS, suggesting a potential optimal challenge level for modulation.
