Neural correlates of the spontaneous phase transition during bimanual coordination
Neural correlates of the spontaneous phase transition during bimanual coordination
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DOI：
10.1093/cercor/bhj075
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发表时间：
2006-09-01
期刊：
影响因子：
3.7
通讯作者：
Sadato, Norihiro
中科院分区：
文献类型：
--
作者：
Aramaki, Yu;Honda, Manabu;Sadato, Norihiro
重复的双手手指敲击运动倾向于镜像对称：在频率应力下，存在从不太稳定的不对称运动模式到更稳定的对称运动模式的自发过渡，但反之亦然。在该相变期间，控制每只手的信号之间的相互作用（串扰）预计将是突出的。为了描述双手协调过程中大脑皮层串扰发生的区域，我们使用双手重复敲击任务进行了事件相关功能磁共振成像。过渡相关的活动被发现在以下区域：双侧腹侧运动前皮质，额下回，额中回，顶下小叶，丘脑，右喙部的背侧运动前皮质和中脑，左侧小脑，和前辅助运动区，喙扣带区，胼胝体。这些区域与双手动作执行所激活的区域是离散的。相位转换相关的激活是右侧的前额叶，运动前区，顶叶区域。这些结果表明，皮层神经串扰发生在分布式网络上游的初级运动皮层通过不对称的半球间的相互作用。
Repetitive bimanual finger-tapping movements tend toward mirror symmetry: There is a spontaneous transition from less stable asymmetrical movement patterns to more stable symmetrical ones under frequency stress but not vice versa. During this phase transition, the interaction between the signals controlling each hand (cross talk) is expected to be prominent. To depict the regions of the brain in which cortical cross talk occurs during bimanual coordination, we conducted event-related functional magnetic resonance imaging using a bimanual repetitive-tapping task. Transition-related activity was found in the following areas: the bilateral ventral premotor cortex, inferior frontal gyrus, middle frontal gyrus, inferior parietal lobule, insula, and thalamus; the right rostral portion of the dorsal premotor cortex and midbrain; the left cerebellum; and the presupplementary motor area, rostral cingulate zone, and corpus callosum. These regions were discrete from those activated by bimanual movement execution. The phase-transition-related activation was right lateralized in the prefrontal, premotor, and parietal regions. These findings suggest that the cortical neural cross talk occurs in the distributed networks upstream of the primary motor cortex through asymmetric interhemispheric interaction.