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首页> 外文会议>17th international conference on biomagnetism advances in biomagnetism - Biomag2010 >Cortical Dynamics Underlying the Visual Perception of Stationary and Moving Stimuli
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Cortical Dynamics Underlying the Visual Perception of Stationary and Moving Stimuli

机译：静止和运动刺激的视觉感知基础的皮层动力学。

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In this study, we investigated the neural responses during the perception of stationary dots, randomly moving point light dots and point light dots representing human motion. We recorded cortical responses from ten right handed subjects with a 151 channel whole head MEG system (VSM MedTech, Coquitlam, BC). For each subject a three-dimensional spatial distribution of source activity was computed using differential SAM beamforming method. The data were spatially normalized to a common brain template and group-averaged for each condition. Locations showing statistically significant differences between conditions were chosen for time frequency analysis. We compared the random motion and human motion with the stationary display and then compared the random and human motion. Perception of random motion was associated with greater desynchronization in the alpha band in the left lingual and (L) superior parietal region and (R) precuneus and mid-temporal regions as compared with stationary dots. Perception of human motion led to greater desynchronization in the (L) precentral region and the (R) mid-temporal and post-central areas in comparison with random motion. Late activation in the gamma band activity was observed in both motion conditions in the visual areas in comparison to the static displays. These data suggest that (a) the perception of motion involves both the dorsal and ventral pathways and the interaction between these subsystems may be important for visual discrimination and (b) that action cues depicting human motion are sufficient to selectively activate premotor and sensory-motor regions.
机译：在这项研究中，我们研究了在感知固定点，随机移动的点光点和代表人类运动的点光点时的神经反应。我们用151通道全头MEG系统（VSM MedTech，Coquitlam，BC）记录了来自十个右撇子受试者的皮质反应。对于每个对象，使用差分SAM波束成形方法计算了源活动的三维空间分布。将数据在空间上标准化为通用的大脑模板，并针对每种情况进行分组平均。选择在条件之间显示出统计学上显着差异的位置进行时频分析。我们将随机运动和人体运动与固定显示器进行了比较，然后比较了随机运动和人体运动。与固定点相比，对随机运动的感知与左舌和（L）顶上叶区域以及（R）早突和颞中部区域的alpha波段更大的失步相关。与随机运动相比，对人的运动的感知导致（L）中央前区域和（R）颞中和中央后区域更大的失步。与静态显示相比，在视觉区域的两种运动条件下都观察到了伽玛带活动的后期激活。这些数据表明（a）运动的感知涉及背侧和腹侧路径，并且这些子系统之间的相互作用对于视觉辨别可能很重要；（b）描绘人类运动的动作提示足以选择性激活前运动和感觉运动。地区。

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