Top-down effect of strategy on the perception of human biological motion: A PET investigation
Top-down effect of strategy on the perception of human biological motion: A PET investigation
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DOI：
10.1080/026432998381023
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发表时间：
1998-09-01
影响因子：
3.4
通讯作者：
Costes, N
中科院分区：
文献类型：
--
作者：
Grezes, J;Costes, N
该实验旨在利用正电子发射断层扫描研究与人类运动感知相关的神经网络。对没有任何目的的有意义和无意义的手部动作的感知与对同类刺激的感知形成对比，目的是稍后模仿它们。将手部静止的感知作为基准水平。对有意义的行为和没有任何目标的无意义行为的感知与一组共同的皮层区域的激活有关。在两个半球中，枕颞交界处 (Ba 37/19) 和枕上回 (Ba 19) 均受累。在左半球，颞中回（Ba 21）和顶下叶（Ba 40）被发现被激活。这些区域被解释为与手部运动的分析相关。手部表征区域内的中央前回 (Ba 4) 在左半球被激活 除了这个共同网络之外，有意义和无意义的运动分别涉及特定网络：有意义的动作与主要位于左半球额下回 (Ba 44/45) 和梭状回 (Ba 38/20) 的激活相关，而无意义的动作则涉及背侧通路（顶下叶、 Ba 40 和顶上小叶，Ba 7) 双侧和右侧小脑。相比之下，当感知的目的是模仿时，有意义和无意义的行为几乎共享相同的网络。激活位于右侧小脑和双侧到达前运动皮层的背侧通路。在观察有意义的动作时，额外的双侧激活位于 SMA 和眶额皮层。因此，当感知没有目标时，大脑激活的模式取决于所呈现运动的性质。但当感知有一个目标，即模仿时，主体的策略对信息处理产生自上而下的影响，这似乎优先考虑感知行动所涉及的背侧通路。
This experiment was designed to investigate the neural network engaged by the perception of human movements using positron emission tomography. Perception of meaningful and of meaningless hand actions without any purpose was contrasted with the perception of the same kind of stimuli with the goal to imitate them later. A condition that consisted of the perception of stationary hands served as a baseline level.Perception of meaningful actions and meaningless actions without any aim was associated with activation of a common set of cortical regions. In both hemispheres, the occipito-temporal junction (Ba 37/19) and the superior occipital gyrus (Ba 19) were involved. In the left hemisphere, the middle temporal gyrus (Ba 21) and the inferior parietal lobe (Ba 40) were found to be activated. These regions are interpreted as related to the analysis of hand movements. The precentral gyrus, within the area of hand representation (Ba 4), was activated in the left hemisphere In addition to this common network, meaningful and meaningless movements engaged specific networks, respectively: meaningful actions were associated with activations mainly located in the left hemisphere in the inferior frontal gyrus (Ba 44/45) and the fusiform gyrus (Ba 38/20), whereas meaningless actions involved the dorsal pathway (inferior parietal lobe, Ba 40 and superior parietal lobule, Ba 7) bilaterally and the right cerebellum. In contrast, meaningful and meaningless actions shared almost the same network when the aim of the perception was to imitate. Activations were located in the right cerebellum and bilaterally in the dorsal pathway reaching the premotor cortex. Additional bilateral activations were located in the SMA and in the orbitofrontal cortex during observation of meaningful actions.Thus, when perception has no goal, the pattern of brain activation is dependent on the nature of the movements presented. But when perception has a goal, namely to imitate, the subject's strategy has a top-down effect on the information processing, which seems to give priority to the dorsal pathway involved in perception for action.