Activity in the posterior parietal cortex mediates visual dominance over kinesthesia
Activity in the posterior parietal cortex mediates visual dominance over kinesthesia
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DOI：
10.1523/jneurosci.0970-07.2007
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发表时间：
2007-06-27
影响因子：
5.3
通讯作者：
Naito, Eiichi
中科院分区：
文献类型：
--
作者：
Hagura, Nobuhiro;Takei, Tomohiko;Naito, Eiichi
当肢体的视觉和动觉信息均可用时，视觉通常是用于感知空间位置的主要信息来源。在这项研究中，我们进行了行为和功能磁共振成像（fMRI）实验，以检查在感知手的位置时视觉支配动觉的大脑机制。我们使用肌腱振动来诱发静止的手的弯曲运动的错觉，而参与者通过在线摄像机观看振动或非振动的静态手的实时图像。仅当参与者观看振动手的静态图像时，幻觉运动的强度才会显着减弱（对于左手和右手）。 fMRI研究表明，后顶叶皮层（PPC）专门参与错觉运动的衰减，并且PPC的活动与衰减程度相关。这表明当视觉推翻同时可用的用于估计肢体空间位置的动觉信息时，PPC 参与多感觉处理。因此，有人认为，当大脑从身体接收到潜在冲突的多感官信息时，人类顶叶皮层可能在维持连贯的身体形象方面发挥着关键作用。
When both visual and kinesthetic information of a limb are available, vision is usually the dominant source of information used to perceive the spatial location. In this study, we conducted behavioral and functional magnetic resonance imaging (fMRI) experiments to examine the brain mechanisms underlying the visual dominance over kinesthesia in perceiving the position of a hand. We used tendon vibration to induce an illusory percept of flexion movement of an immobile hand, while the participants viewed a live image of either the vibrated or nonvibrated static hand through an on-line video camera. The intensity of illusory movement was significantly attenuated (for both the left and right hands) only when the participants viewed the static image of the vibrated hand. The fMRI study showed that the posterior parietal cortex (PPC) is specifically involved in the attenuation of illusory movement and that the activity of the PPC was associated with the degree of attenuation. This indicates that PPC is involved in the multisensory processing that occurs when vision overrules simultaneously available kinesthetic information for estimating the spatial location of a limb. It is thus suggested that the human parietal cortex may play a critical role in the maintenance of a coherent body image when the brain receives potentially conflicting multisensory information from the body.