Role of supplementary motor area during performance of loss-resulting pursuant paper-rock-scissors

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  • Fukunaga Atsushi
    Department of Neurosurgery, Keio University School of Medicine Ogawa Laboratories For Brain Function Research, Hamano Life Science Research Foundation
  • Ohira Takayuki
    Department of Neurosurgery, Keio University School of Medicine
  • Kato Motoichiro
    Department of Neuropsychiatry, Keio University School of Medicine
  • Kashima Haruo
    Department of Neuropsychiatry, Keio University School of Medicine
  • Kawase Takeshi
    Department of Neurosurgery, Keio University School of Medicine

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  • 後出し負けじゃんけん時の補足運動野の役割

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The performance of pursuant loss-resulting paper-rock-scissors with the hands is known to require control and integration of frontal lobe function. However, what area of the brain is actually activated during pursuant paper-rock-scissors remains unclear. Here, we evaluated how the brain functions during loss-resulting or tie-resulting pursuant paper-rock-scissors with the dominant or non-dominant hands, using a 3-tesla functional MRI in normal right-handed subjects. Data analysis was carried out using Brain VoyagerTM software (version 4.9.1), and the differences between the resting and movement conditions were statistically evaluated using a general linear model (single study), convolved with the synthetic canonical hemodynamic response function as supplied by Brain Voyager. Significance was reported at a corrected p<0.05 level (F values, 5.2) by the multiple comparison method (Bonferroni's correction). For group data analysis, all the individual data sets were averaged in Talairach space. The results showed that activated blood oxygenation level-dependent signals were observed in the frontal lobe, supplementary motor area (SMA), sensorimotor area, and cerebellar hemisphere when a pursuant paper-rock-scissors task was performed. Interestingly, the right SMA was activated more strongly during tie-resulting pursuant paper-rock-scissors with the left hand, while the left SMA was activated more strongly during loss-resulting pursuant paper-rock-scissors with the left hand. In conclusion, these findings suggest that the left SMA might be associated with inhibition of stereotypical performance and monitoring of conflict in the subject's mind. Further investigation is required to clarify more detailed functions of the left SMA.

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