Human posterior parietal cortex mediates hand-specific planning.
Human posterior parietal cortex mediates hand-specific planning.
复制标题
人类后顶叶皮层介导手部特定规划。
DOI：
10.1016/j.neuroimage.2015.03.058
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发表时间：
2015
期刊：
影响因子：
5.7
通讯作者：
Frey,ScottH
中科院分区：
文献类型：
--
作者：
Valyear,KennethF;Frey,ScottH
行动计划的基础过程是适应性行为的基础，并且可以受到最近运动经验的影响。在这里，我们使用了一种新的功能磁共振重复抑制（RS）的设计来测试的假设，行动规划展开更有效地连续行动，用同一只手。更有效的处理被预测与更快的反应时间（RT），以启动行动和减少功能磁共振成像活动水平- RS。与这些预测一致，我们检测到更快的RT的行动，用同一只手和伴随的fMRI-RS在双侧后顶叶皮质和右侧顶叶盖。在后顶叶皮质内，这些RS效应局限于顶内和上级顶叶皮质。这些区域在涉及对侧手的动作中被更强烈地激活。研究结果提供了令人信服的新证据的具体手的行动计划的规格，并表明，这些过程是敏感的最近的运动史。与计算效率帐户的运动历史的影响一致，研究结果被解释为证据，相对更有效的处理基础的行动计划时，连续的行动涉及相同的，而不是相反的手。
The processes underlying action planning are fundamental to adaptive behavior and can be influenced by recent motor experience. Here, we used a novel fMRI Repetition Suppression (RS) design to test the hypotheses that action planning unfolds more efficiently for successive actions made with the same hand. More efficient processing was predicted to correspond with both faster response times (RTs) to initiate actions and reduced fMRI activity levels — RS. Consistent with these predictions, we detected faster RTs for actions made with the same hand and accompanying fMRI-RS within bilateral posterior parietal cortex and right-lateralized parietal operculum. Within posterior parietal cortex, these RS effects were localized to intraparietal and superior parietal cortices. These same areas were more strongly activated for actions involving the contralateral hand. The findings provide compelling new evidence for the specification of action plans in hand-specific terms, and indicate that these processes are sensitive to recent motor history. Consistent with computational efficiency accounts of motor history effects, the findings are interpreted as evidence for comparatively more efficient processing underlying action planning when successive actions involve the same versus opposite hand.