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首页> 外文会议>17th international conference on biomagnetism advances in biomagnetism - Biomag2010 >Neural Interactions between Dorsal and Ventral Visual Subsystems While Perceiving 3-D Structure from 2-D Motion
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Neural Interactions between Dorsal and Ventral Visual Subsystems While Perceiving 3-D Structure from 2-D Motion

机译：从二维运动感知3-D结构时，背侧和腹侧视觉子系统之间的神经相互作用

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Two-dimensional optic flow is an important cue to perceive 3D structure of objects. Recent neuroimaging studies suggest the involvement of both the ventral and the dorsal visual pathways in the perception of 3D structure from motion (3D-SFM), though the neural dynamics underlying the 3D-SFM is not fully understood. Here, we combine magne-toencephalography (MEG) and fMRI to detect the dynamic brain responses to 3D-SFM. We manipulated the coherence of randomly moving dots to create different levels of 3D perception and investigated the associated changes in brain activity. Results of the fMRI analysis were used to impose plausible constraints on the MEG inverse calculation to improve spatial resolution of the spatiotemporal activity estimates. Time-frequency analysis was also employed to elucidate spatio-temporal dynamic changes in the spontaneous brain activities. MEG-fMRI combined analysis showed that the activities the posterior infero-temporal (pIT), parieto-occipital (PO), and intra-parietal (IP) regions were increased at different latencies during highly coherent motion conditions in which subjects perceived a robust 3D object. Results of the time-frequency analysis indicated the suppression of alpha- and beta-band activities in these regions which reflect the commitment of these areas in the perception of 3D-SFM. Current results suggest that the interactions between the dorsal and ventral visual subsystems are crucial for the perception of 3D object from 2D optic flow.
机译：二维光流是感知物体3D结构的重要线索。最近的神经影像学研究表明，尽管对3D-SFM背后的神经动力学尚未完全了解，但从运动（3D-SFM）感知3D结构时，腹侧和背侧视觉通路均参与其中。在这里，我们结合了脑磁图（MEG）和功能磁共振成像来检测动态大脑对3D-SFM的反应。我们操纵了随机移动的点的连贯性，以创建不同级别的3D感知，并研究了大脑活动的相关变化。 fMRI分析的结果被用于对MEG逆计算施加合理的约束，以提高时空活动估计的空间分辨率。时频分析还用于阐明自发性大脑活动中的时空动态变化。 MEG-fMRI组合分析显示，在高度连贯的运动条件下，受试者的后方颞下（pIT），顶枕（PO）和顶内（IP）区域的活动在不同的等待时间有所增加，在这种情况下，受试者感知到了坚固的3D宾语。时频分析的结果表明，这些区域的α和β波段活动受到抑制，这反映了这些区域对3D-SFM的感知。当前结果表明，背侧和腹侧视觉子系统之间的相互作用对于从2D光学流感知3D对象至关重要。

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