The effect of tapping finger and mode differences on cortical and subcortical activities: a PET study
The effect of tapping finger and mode differences on cortical and subcortical activities: a PET study
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DOI：
10.1007/s00221-004-2008-9
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发表时间：
2005-01-01
影响因子：
2
通讯作者：
Kinoshita, H
中科院分区：
文献类型：
--
作者：
Aoki, T;Tsuda, H;Kinoshita, H
采用正电子发射断层扫描（PET）对10名未接受特殊手指训练的年轻健康志愿者进行了不同手指和不同敲击方式的大脑区域的研究。听觉节奏（2hz）的敲击动作由食指(I)或无名指(R)单独进行（单指敲击），并由I和中指(M)或R和小指(L)交替使用（双指敲击）。每位受试者还提供了在敲击任务中感知任务难度和肌肉疲劳程度的主观排名。用R指敲击时，大脑的激活区域在额叶区、颞叶区以及小脑中比用I指敲击时更广泛。RL和IM手指对的比较也显示了类似的结果。感知任务难度，以及肌肉疲劳，R指或R指对也比I指或m指对更高。这些结果表明，不同任务难度的单个手指或对手指的运动在皮层和皮层下系统的结构上表现不同。单指模式和双指模式的比较表明，除了单指模式下激活的脑区外，双侧背侧运动前区和左侧初级运动/感觉区以及右侧小脑前部也在双指模式下被激活。这些额外的区域可能是两个手指执行和运动顺序操作的基本结构。
Using positron emission tomography (PET), the brain regions recruited for the tapping movement by different fingers and different tapping modes were investigated in ten young healthy volunteers without specific finger training. Auditory-paced (2 Hz) tapping movements were performed by the index (I) or ring (R) finger alone (single-finger tapping) and by the alternate use of the I and middle (M) fingers or the R and little (L) fingers (double-finger tapping). Each subject also provided subjective rankings of perceived task difficulty, as well as muscular fatigue, among the tapping tasks. The activated areas of the brain during tapping by the R finger were more extensive in the frontal and temporal areas, as well as the cerebellum, than during tapping by the I finger. A similar result was revealed for the comparison of the RL and IM finger pairs. The perceived task difficulty, as well as muscular fatigue, was also higher for the R finger or RL finger pair than the I finger or IM finger pair. These results indicate that movement of individual fingers or finger pairs with different levels of task difficulty is represented differently in the structures of cortical and subcortical systems. A comparison of the single- and double-finger modes revealed that in addition to the brain areas activated during single-finger mode, the bilateral dorsal premotor and left primary motor/sensory areas and the right anterior cerebellum were also activated during the double-finger mode. These additional areas could be essential structures for the execution and motor sequence operation of the two fingers.