Pillow Jonathan, Rubin Nava
Center for Neural Science, New York University, 4 Washington Place, New York, NY 10003, USA.
Neuron. 2002 Feb 28;33(5):805-13. doi: 10.1016/s0896-6273(02)00605-0.
Perceptual completion can link widely separated contour fragments and interpolate illusory contours (ICs) between them. The mechanisms underlying such long-range linking are not well understood. Here we report that completion is much poorer when ICs cross the vertical meridian than when they reside entirely within the left or right visual hemifield. This deficit reflects limitations in cross-hemispheric integration. We also show that the sensitivity to the interhemispheric divide is unique to perceptual completion: a comparable task which did not require completion showed no across-meridian impairment. We propose that these findings support the existence of specialized completion mechanisms in early visual cortical areas (V1/V2), since those areas are likely to be more sensitive to the interhemispheric divide.
知觉完形可以将相距甚远的轮廓片段连接起来，并在它们之间插入虚幻轮廓（ICs）。这种远距离连接背后的机制尚未得到很好的理解。在这里，我们报告称，当ICs穿过垂直子午线时，完形效果比它们完全位于左或右视觉半视野时要差得多。这种缺陷反映了跨半球整合的局限性。我们还表明，对半球间分界线的敏感性是知觉完形所特有的：一项不需要完形的类似任务没有显示出跨子午线的损伤。我们提出，这些发现支持早期视觉皮层区域（V1/V2）中存在专门的完形机制，因为这些区域可能对半球间分界线更敏感。
