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Kinematics and EMG

開催日 2014/9/11
時間 16:00 - 17:00
会場 Poster / Exhibition(Event Hall B)

Dual-hemisphere direct current stimulation over the secondary somatosensory cortex improves spatial tactile acuity in human

  • P1-116
  • 藤本 修平 / Shuhei Fujimoto:1,2 山口 智史 / Tomofumi Yamaguchi:1,3 今 法子 / Noriko Kon:2 大須 理英子 / Rieko Osu:4 大高 洋平 / Yohei Otaka:1,3 近藤 国嗣 / Kunitsugu Kondo:1 北田 亮 / Ryo Kitada:5 田中 悟志 / Satoshi Tanaka:6 
  • 1:東京湾岸リハビリテーション病院 / Tokyo Bay Rehabilitation Hospital 2:京都大学大学院医学研究科社会健康医学系専攻 / Dept Publich Health, Kyoto University graduate school of medicine, Kyoto, Japan 3:慶應義塾大学医学部リハビリテーション医学教室 / Dept Rehabilitation, Keio University school of medicine, Tokyo, Japan 4:国際電気通信基礎技術研究所 / Advanced Telecommunications Research Institute International, Kyoto, Japan 5:生理学研究所 / National Institute for Physiological Sciences 6:浜松医科大学医学部 / Hamamatsu University School of Medicine, Shizuoka, Japan 

Objective: The functional relevance of the secondary somatosensory cortex (S2) in spatial tactile acuity remains under investigation in human. The aim of this study was to test the hypothesis that dual-hemisphere transcranial direct current stimulation (tDCS) over the S2 could modulate behavioral performance in a tactile spatial discriminative task.
Methods: Ten healthy adults participated in this double-blind, sham-controlled, and cross-over design study. The performance in a grating orientation task (GOT) in the left and right index fingers was evaluated under three stimulation conditions: anodal over the right with cathodal over the left S2, anodal over the left with cathodal over the right S2, or sham stimulation. In the first two conditions, 2 mA tDCS was applied for 15min. In sham condition, 2 mA tDCS was applied only for first 15 sec. This study was approved by the local ethics committee of Tokyo Bay Rehabilitation Hospital and supported by a scientific grant (KAKENHI , 24680061).
Results and discussion: Performance in the GOT with the left index finger during right anodal/ left cathodal stimulation over the S2 was significantly higher than that in sham stimulation. In contrast, performance in the GOT with the right index finger during left anodal/ right cathodal stimulation over the S2 was significantly higher than that in sham stimulation. This double dissociative effect of tDCS revealed the functional relevance of each hemisphere of the S2 in spatial tactile acuity of the contralateral index finger. In addition, the present result suggests that dual-hemisphere tDCS over the S2 may be a useful strategy to improve sensory function in patients with sensory dysfunctions.
Conclusions: Dual-hemisphere tDCS over the S2 improved performance in a tactile spatial discrimination task in human.

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