Effect of motion contrast on human cortical responses to moving stimuli.
Effect of motion contrast on human cortical responses to moving stimuli.
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DOI：
10.1152/jn.1998.79.5.2794
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发表时间：
1998-05
影响因子：
2.5
通讯作者：
G. Shulman;Jacob Schwarz;F. Miezin;S. Petersen
中科院分区：
文献类型：
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作者：
G. Shulman;Jacob Schwarz;F. Miezin;S. Petersen
用正电子发射断层扫描（PET）研究了由运动定义轮廓激活的人类皮层区域。受试者通过21度直径孔径观察四种随机点场：平移点场的单向运动、两个叠加平移场的反方向运动、连续空间区域内点的反方向运动（运动对比），产生由运动定义的方波光栅；连续空间区域内静止点的亮度变化，产生由亮度定义的方波光栅。相对于静态点场，单向运动条件激活了先前描述的区域，包括17/18区，外侧颞-枕-顶叶皮层（MT/MST）和颞上沟。运动定义的光栅增加了17/18区和MT/MST区的激活，但没有增加颞上沟的激活，并且增加了楔骨的背侧区域，大致对应于V3/V3a，增加了舌回/侧沟的腹侧区域，大致对应于V2/VP。亮度定义的光栅，相对于静态点场，激活区域17/18，背楔中与运动定义光栅激活的区域相似的区域，以及靠近左侧侧沟的区域，稍微侧向运动光栅激活。他们还激活了右侧梭状回的一个区域，这个区域被运动光栅激活得更弱。这些结果表明，在大的运动场中增加运动对比度会增加17/18区和MT/MST区的活动，并增加运动和亮度定义轮廓相似的背侧和腹侧区域。
The cortical areas activated by motion-defined contours were studied in humans using positron emission tomography (PET). Subjects observed four types of random dot fields, displayed through a 21 degrees diam aperture: unidirectional motion of a translating dot field, motion in opposing directions of two superimposed translating fields, motion in opposing directions of dots in contiguous spatial regions (motion contrast), producing a square wave grating defined by motion, and luminance variation of stationary dots in contiguous spatial regions, producing a square wave grating defined by luminance. Relative to a static dot field, the unidirectional motion condition activated areas previously described, including areas 17/18, lateral temporal-occipital-parietal cortex (MT/MST), and the superior temporal sulcus. Motion-defined gratings increased the activation of areas 17/18 and MT/MST, but not the superior temporal sulcus, and added more dorsal areas in the cuneus, roughly corresponding to V3/V3a, and ventral areas in the lingual gyrus/collateral sulcus, roughly corresponding to V2/VP. Luminance defined gratings, relative to a static dot field, activated areas 17/18, regions in the dorsal cuneus similar to those activated by motion defined gratings, and a region near the left collateral sulcus, slightly lateral to the motion grating activation. They also activated a region in the right fusiform gyrus that was more weakly activated by the motion grating. These results indicate that adding motion contrast to large moving fields increases activity in areas 17/18 and MT/MST and adds both dorsal and ventral regions that are similar for motion and luminance defined contours.