Importance of human right inferior frontoparietal network connected by inferior branch of superior longitudinal fasciculus tract in corporeal awareness of kinesthetic illusory movement
Importance of human right inferior frontoparietal network connected by inferior branch of superior longitudinal fasciculus tract in corporeal awareness of kinesthetic illusory movement
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DOI：
10.1016/j.cortex.2016.01.017
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发表时间：
2016-05-01
期刊：
影响因子：
3.6
通讯作者：
Naito, Eiichi
中科院分区：
文献类型：
--
作者：
Amemiya, Kaoru;Naito, Eiichi
一般认为，人的右脑半球在身体意识中起着主导作用，这与身体自我的意识体验高度相关。根据我们先前的研究结果，我们研究了当人们经历动觉性错觉肢体运动时经常观察到的右额顶叶激活是否受到由上级纵向束纤维束的特定分支连接的大规模脑网络的支持（SLF I，II，我们用功能性磁共振成像（MRI）扫描大脑活动，而19名被蒙上眼睛的健康志愿者经历了由肌腱振动引起的右手静止的错觉运动，这在扫描后被复制。我们还扫描了他们在执行和想象右手动作时的大脑活动，并确定了在幻觉、执行和想象过程中与SLF纤维束相关的活跃大脑区域，我们发现幻觉主要激活了由SLF III连接的右下额顶叶区域，而在执行和想象过程中，这些区域基本上没有被激活。在这些区域中，活动在右下顶叶皮质和下额叶皮质显示右侧优势和相关性以及幻觉（动觉错觉意识）的参与者所经历的金额。结果说明了主导参与的右下额顶叶网络连接的SLF III当人们认识到他们的肢体姿势变化。我们假设网络承担着一系列的功能，具体来说，监测肌肉骨骼系统的当前状态，建立和更新我们的姿势模型（身体图式），这可能是身体自我的意识体验的基础。(C)2016作者爱思唯尔有限公司出版
It is generally believed that the human right cerebral hemisphere plays a dominant role in corporeal awareness, which is highly associated with conscious experience of the physical self. Prompted by our previous findings, we examined whether the right frontoparietal activations often observed when people experience kinesthetic illusory limb movement are supported by a large-scale brain network connected by a specific branch of the superior longitudinal fasciculus fiber tracts (SLF I, II, and III).We scanned brain activity with functional magnetic resonance imaging (MRI) while nineteen blindfolded healthy volunteers experienced illusory movement of the right stationary hand elicited by tendon vibration, which was replicated after the scanning. We also scanned brain activity when they executed and imagined right hand movement, and identified the active brain regions during illusion, execution, and imagery in relation to the SLF fiber tracts.We found that illusion predominantly activated the right inferior frontoparietal regions connected by SLF III, which were not substantially recruited during execution and imagery. Among these regions, activities in the right inferior parietal cortices and inferior frontal cortices showed right-side dominance and correlated well with the amount of illusion (kinesthetic illusory awareness) experienced by the participants.The results illustrated the predominant involvement of the right inferior frontoparietal network connected by SLF III when people recognize postural changes of their limb. We assume that the network bears a series of functions, specifically, monitoring the current status of the musculoskeletal system, and building-up and updating our postural model (body schema), which could be a basis for the conscious experience of the physical self. (C) 2016 The Authors. Published by Elsevier Ltd.