Does area V3A predict positions of moving objects?
Does area V3A predict positions of moving objects?
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DOI：
10.3389/fpsyg.2010.00186
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发表时间：
2010-01-01
影响因子：
3.8
通讯作者：
Muckli, Lars
中科院分区：
文献类型：
--
作者：
Maus, Gerrit W.;Weigelt, Sarah;Muckli, Lars
逐渐褪色的移动物体在超出其亮度检测阈值的位置处被感知为消失，而突然的偏移通常会被准确定位。视觉皮层中的视网膜专题活动在运动引起的褪色物体终点错误定位中发挥什么作用？使用功能磁共振成像（fMRI），我们在视网膜主题图中定位了感兴趣区域（ROI），该区域邻接条形的轨迹端点，该条形向或远离该位置移动，同时亮度逐渐降低或增加。 V3A 区域显示出预测活性，对于朝向 ROI 的运动和远离 ROI 的运动具有更强的 fMRI 响应。这种效应与亮度的变化无关。在区域 V1 中，我们发现 ROI 附近高对比度起始点和偏移量的活动较高，但运动方向之间没有显着差异。我们认为，运动物体的感知最终位置是基于较高运动敏感视网膜区域中的预测位置表示和初级视觉皮层中的偏移瞬态的相互作用。
A gradually fading moving object is perceived to disappear at positions beyond its luminance detection threshold, whereas abrupt offsets are usually localized accurately. What role does retinotopic activity in visual cortex play in this motion-induced mislocalization of the endpoint of fading objects? Using functional magnetic resonance imaging (fMRI), we localized regions of interest (ROIs) in retinotopic maps abutting the trajectory endpoint of a bar moving either toward or away from this position while gradually decreasing or increasing in luminance. Area V3A showed predictive activity, with stronger fMRI responses for motion toward versus away from the ROI. This effect was independent of the change in luminance. In Area V1 we found higher activity for high-contrast onsets and offsets near the ROI, but no significant differences between motion directions. We suggest that perceived final positions of moving objects are based on an interplay of predictive position representations in higher motion-sensitive retinotopic areas and offset transients in primary visual cortex.