Goal-selection and movement-related conflict during bimanual reaching movements
Goal-selection and movement-related conflict during bimanual reaching movements
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DOI：
10.1093/cercor/bhj108
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发表时间：
2006-12-01
期刊：
影响因子：
3.7
通讯作者：
Ivry, Richard B.
中科院分区：
文献类型：
--
作者：
Diedrichsen, Joern;Grafton, Scott;Ivry, Richard B.
双手运动中的冲突可能出现在运动目标的选择或运动规划和执行过程中。我们证明了这两种类型的冲突的行为和神经分离。在功能磁共振成像扫描，参与者进行双手达到运动与对称（一致）或正交（不一致）的轨迹。所需的动作要么在空间上通过照亮目标来表示，要么在象征性上使用集中呈现的字母来表示。符号线索的处理导致左半球网络的激活增加，包括顶内沟、前运动皮层和额下回。不一致的动作的反应时间成本大大大于符号比空间线索，表明成本主要与运动目标的选择和分配，要求最小化时，目标直接指定的空间线索。这种目标选择冲突增加了前辅助运动区和扣带运动区的活动。这两个提示条件导致较大的激活不一致的运动中的凸性的上级顶叶皮层，双边，使该地区可能的神经网站的冲突，出现在规划和执行双手动作。这些结果表明，不同的神经位点的2种形式的限制，我们的能力，执行双手达到运动。
Conflict during bimanual movements can arise during the selection of movement goals or during movement planning and execution. We demonstrate a behavioral and neural dissociation of these 2 types of conflict. During functional magnetic resonance imaging scanning, participants performed bimanual reaching movements with symmetric (congruent) or orthogonal (incongruent) trajectories. The required movements were indicated either spatially, by illuminating the targets, or symbolically, using centrally presented letters. The processing of symbolic cues led to increased activation in a left hemisphere network including the intraparietal sulcus, premotor cortex, and inferior frontal gyrus. Reaction time cost for incongruent movements was substantially larger for symbolic than for spatial cues, indicating that the cost was primarily associated with the selection and assignment of movement goals, demands that are minimized when goals are directly specified by spatial cues. This goal-selection conflict increased activity in the pre-supplementary motor area and cingulate motor areas. Both cueing conditions led to larger activation for incongruent movements in the convexity of the superior parietal cortex, bilaterally, making this region a likely neural site for conflict that arises during the planning and execution of bimanual movements. These results suggest distinct neural loci for 2 forms of constraint on our ability to perform bimanual reaching movements.