Michels Lars, Kleiser Raimund, de Lussanet Marc H E, Seitz Rüdiger J, Lappe Markus
Psychological Institute II, Westf. Wilhelms-Universität Münster, Germany.
Neuroimage. 2009 Mar 1;45(1):151-9. doi: 10.1016/j.neuroimage.2008.10.063. Epub 2008 Nov 19.
Biological motion, the movement of the human body presented by a small number of point lights, activates among other regions lining the posterior superior temporal sulcus (pSTS) and gyrus (pSTG) and of the fusiform gyrus. In previous studies with foveal stimuli the activity in the pSTS/pSTG was often confined to the right hemisphere and bilateral in fusiform gyrus. We presented biological motion stimuli in peripheral vision and measured the BOLD responses with functional MRI to test whether the right dominance in pSTS/pSTG also occurred with peripheral stimuli. We found activation exclusively in the right pSTG for both visual hemifields. In the fusiform gyrus activation was found in both hemispheres and for peripheral stimuli strongest for contralateral stimulation. However, in both fusiform gyri leftward-facing stimuli activated different subfields than rightward-facing stimuli, indicating a clustering of the selectivity for the orientation of the human body form. No such clustering was observed in the pSTG. The results indicate for the fusiform gyrus an organization with respect to the view orientation of the stimulus.
生物运动，即由少数点光源呈现的人体运动，除了激活颞上沟后部（pSTS）、颞上回（pSTG）以及梭状回的内侧区域外，还会激活其他区域。在之前使用中央凹刺激的研究中，pSTS/pSTG的活动通常局限于右半球，而梭状回的活动则是双侧的。我们在外周视觉中呈现生物运动刺激，并使用功能磁共振成像测量血氧水平依赖（BOLD）反应，以测试在外周刺激下pSTS/pSTG中是否也存在右侧优势。我们发现，两个视野的刺激均仅激活右侧pSTG。在梭状回中，两个半球均有激活，且外周刺激时对侧刺激的激活最强。然而，在两个梭状回中，向左的刺激激活的子区域与向右的刺激不同，这表明对人体形态方向的选择性存在聚类。在pSTG中未观察到这种聚类。结果表明，梭状回存在与刺激视图方向有关的组织。
