Deparment of Neurosciences, KU Leuven, Leuven, Belgium; Leuven Brain Institute, KU Leuven, Leuven, Belgium.
Department of Cognitive Neurology, University of Tuebingen, Tuebingen, Germany.
Neuroimage. 2023 Apr 1;269:119907. doi: 10.1016/j.neuroimage.2023.119907. Epub 2023 Jan 27.
Previous functional imaging studies demonstrated body-selective patches in the primate visual temporal cortex, comparing activations to static bodies and static images of other categories. However, the use of static instead of dynamic displays of moving bodies may have underestimated the extent of the body patch network. Indeed, body dynamics provide information about action and emotion and may be processed in patches not activated by static images. Thus, to map with fMRI the full extent of the macaque body patch system in the visual temporal cortex, we employed dynamic displays of natural-acting monkey bodies, dynamic monkey faces, objects, and scrambled versions of these videos, all presented during fixation. We found nine body patches in the visual temporal cortex, starting posteriorly in the superior temporal sulcus (STS) and ending anteriorly in the temporal pole. Unlike for static images, body patches were present consistently in both the lower and upper banks of the STS. Overall, body patches showed a higher activation by dynamic displays than by matched static images, which, for identical stimulus displays, was less the case for the neighboring face patches. These data provide the groundwork for future single-unit recording studies to reveal the spatiotemporal features the neurons of these body patches encode. These fMRI findings suggest that dynamics have a stronger contribution to population responses in body than face patches.
先前的功能成像研究表明，灵长类动物视觉颞叶皮层中存在身体选择性斑块，通过比较对静态身体和其他类别静态图像的激活情况来进行研究。然而，使用静态而不是动态显示运动的身体可能低估了身体斑块网络的程度。事实上，身体动态提供了关于动作和情绪的信息，并且可能在不被静态图像激活的斑块中进行处理。因此，为了用 fMRI 绘制猕猴视觉颞叶皮层中完整的身体斑块系统图谱，我们采用了自然动作的猴体、动态猴脸、物体以及这些视频的乱序版本的动态显示，所有这些都在注视时呈现。我们在颞叶皮层中发现了九个身体斑块，从颞上沟（STS）的后部开始，到颞极的前部结束。与静态图像不同，身体斑块始终存在于 STS 的下部和上部。总的来说，与匹配的静态图像相比，动态显示会引起身体斑块的更高激活，而对于相邻的面部斑块，这种情况则不那么明显。这些数据为未来的单细胞记录研究提供了基础，以揭示这些身体斑块神经元编码的时空特征。这些 fMRI 发现表明，动态对身体斑块中的群体反应的贡献强于面部斑块。
