Tallet Jessica, Barral Jérôme, Hauert Claude-Alain
Laboratoire du Développement et des Apprentissages Moteurs, Faculté de Psychologie et des Sciences de l'Education, Université de Genève, Switzerland.
Brain Res. 2009 Aug 11;1284:68-76. doi: 10.1016/j.brainres.2009.05.058. Epub 2009 Jun 2.
In this study, we compared a selective stop task (transition from a bimanual in-phase to a unimanual index fingers' tapping), with a non-selective stop task (stopping a bimanual in-phase tapping at all), and with a switching task (transition from in-phase to anti-phase bimanual tapping). The aim was twofold: 1) to identify the electro-cortical correlates of selective and non-selective inhibition processes and 2) to investigate which type of inhibition - selective or not - is required when switching between two bimanual motor patterns. The results revealed that all tasks led to enhanced activation (alpha power) of the left sensorimotor and posterior regions which seems to reflect an overall effort to stop the preferred bimanual in-phase tendency. Each task implied specific functional connectivity reorganizations (beta coherence) between cerebral motor areas, probably reflecting engagement in a new unimanual or bimanual movement.
在本研究中,我们比较了选择性停止任务(从双手同步敲击过渡到单手食指敲击)、非选择性停止任务(完全停止双手同步敲击)和切换任务(从双手同步敲击过渡到双手异步敲击)。目的有两个:1)确定选择性和非选择性抑制过程的脑电皮质相关性;2)研究在两种双手运动模式之间切换时需要哪种类型的抑制——选择性或非选择性。结果显示,所有任务均导致左侧感觉运动区和后部区域的激活增强(阿尔法波功率),这似乎反映了为抑制偏好的双手同步倾向而做出的整体努力。每个任务都意味着大脑运动区域之间特定的功能连接重组(贝塔波相干性),这可能反映了参与新的单手或双手运动。