Considering brain hemispheres asymmetry in motor adaptation by transcranial direct current stimulation
Oral Presentation XML
1Azad university
2University of Mashhad
3Shahid Rajaei Teacher Training University
Introduction: It has been indicated that each part of the brain has different functions, which is defined as the specializations of different parts of the brain for different actions. Transcranial direct current stimulation can improve or impair the function of the brain. This has turned tDCS into a tool that can be used for considering hemispheric specialization in motor adaptation.
Methodology: The participants were 58 voluntaries male student (20.442±1.578 years) that assigned into five groups (right DLPFC, left DLPFC, sham, practice and adaptation groups) as randomly. Participants performed motor patterns with pen mouse. After learning motor patterns (180 trial), the participants practiced patterns in new situation in order to adaptation. Then participants participated in an acquisition and retention tests were conducted after 10 minutes and 48 hours, respectively. The dorsolateral prefrontal cortex areas (F3/F4) stimulated with the 2mA current for 20 minutes. During the practice, the anode was placed on F3, and the cathode was placed on F4 for the left DLPFC stimulation. They were swapped for the right DLPFC stimulation. The Repeated Measure test was used for analyzed the data and One Way ANOVA for comparing groups in any phases and the Bonferroni test was used for pairwise comparisons.
Results: The results showed that stimulation of right hemisphere (right anode/left cathode stimulation) had significant improvement in motor adaptation than other groups.
Discussion: Totally we suggested that the right hemisphere specialized for motor adaptation and these results are interpretable with hybrid motor control hypothesis.
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