Dissociable cortical processing of recognizable and non-recognizable biological movement: analysing gamma MEG activity.
Dissociable cortical processing of recognizable and non-recognizable biological movement: analysing gamma MEG activity.
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可识别和不可识别生物运动的可分离皮质处理：分析伽玛 MEG 活性。
DOI：
10.1093/cercor/bhg117
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发表时间：
2004
期刊：
影响因子：
3.7
通讯作者：
N. Birbaumer
中科院分区：
文献类型：
--
作者：
M. Pavlova;W. Lutzenberger;A. Sokolov;N. Birbaumer
对生物运动的识别是人类进化生存的基本要素之一。当生物运动仅通过看不见的人体关节上的一组光点来揭示时，感知系统就能可靠地将其与类似的配置区分开来。在这里，我们评估了生物运动视觉感知过程中神经磁皮层反应的变化。健康的人类看到一组随机的刺激，其中包括点光规范步行者和乱序配置，其中点的空间位置在屏幕上随机重新排列。在单独的运行中，配置在图像平面中以直立或倒置（180 度）方向呈现。参与者执行了一项单背重复任务，即举起食指，以响应每种类型的两个连续相同刺激中的第二个。早在刺激开始后 100 毫秒内，可识别的直立行走者和不可识别的倒立行走者都会引起左枕叶皮质的振荡伽马脑活动（25-30 Hz）增强。然而，只有可识别的直立行走者才能在顶叶 (130 ms) 和右颞叶 (170 ms) 上产生进一步的连续峰值。扰乱显示不会引起伽马响应的任何增加。皮层振荡活动的特定刺激时间过程和地形动力学表明，大脑迅速分离了通过生物运动揭示的空间连贯性和意义。
Recognition of biological motion is one of the essential ingredients of human evolutionary survival. When biological motion is revealed solely by a set of light dots on the joints of an invisible human figure, the perceptual system reliably distinguishes it from similar configurations. Here, we assessed the changes in neuromagnetic cortical responses during visual perception of biological motion. Healthy humans saw a randomized set of stimuli consisting of a point-light canonical walker and a scrambled configuration in which the spatial positions of dots were randomly rearranged on the screen. In separate runs, configurations were presented either within an upright or inverted (180 degrees ) orientation in the image plane. Participants performed a one-back repetition task lifting a forefinger in response to the second of two consecutive identical stimuli of each type. Both recognizable upright and non-recognizable inverted walkers evoke enhancements in oscillatory gamma brain activity (25-30 Hz) over the left occipital cortices as early as 100 ms from stimulus onset. Only a recognizable upright walker, however, yields further consecutive peaks over the parietal (130 ms) and right temporal (170 ms) lobes. Scrambled displays do not elicit any increases in the gamma response. The stimulus-specific time course and topographic dynamics of cortical oscillatory activity indicate that the brain rapidly dissociates spatial coherence and meaning revealed through biological movement.
影响因子：
56.9
作者：
FOX, R;MCDANIEL, C
通讯作者：
MCDANIEL, C
影响因子：
2.5
作者：
BRUCE, C;DESIMONE, R;GROSS, CG
通讯作者：
GROSS, CG
DOI：
10.1073/pnas.94.7.3408
发表时间：
1997-04-01
影响因子：
11.1
作者：
Shenberg, DL;Logothetis, NK
通讯作者：
Logothetis, NK