Rauschenberger Robert, Liu Taosheng, Slotnick Scott D, Yantis Steven
User Interface Design Center, Siemens Corporate Research, Princeton, New Jersey 08540, USA.
Psychol Sci. 2006 Apr;17(4):358-64. doi: 10.1111/j.1467-9280.2006.01711.x.
The human visual system possesses a remarkable ability to reconstruct the shape of an object that is partly occluded by an interposed surface. Behavioral results suggest that, under some circumstances, this perceptual process (termed amodal completion) progresses from an initial representation of local image features to a completed representation of a shape that may include features that are not explicitly present in the retinal image. Recent functional magnetic resonance imaging (fMRI) studies have shown that the completed surface is represented in early visual cortical areas. We used fMRI adaptation, combined with brief, masked exposures, to track the amodal completion process as it unfolds in early visual cortical regions. We report evidence for an evolution of the neural representation from the image-based feature representation to the completed representation. Our method offers the possibility of measuring changes in cortical activity using fMRI over a time scale of a few hundred milliseconds.
人类视觉系统具有非凡的能力，能够重建被插入表面部分遮挡的物体形状。行为学结果表明，在某些情况下，这种感知过程（称为非模态完成）从局部图像特征的初始表征发展到可能包括视网膜图像中未明确呈现特征的形状的完整表征。最近的功能磁共振成像（fMRI）研究表明，完整的表面在早期视觉皮层区域得到表征。我们使用fMRI适应技术，并结合短暂的掩蔽曝光，来追踪非模态完成过程在早期视觉皮层区域的展开。我们报告了神经表征从基于图像的特征表征到完整表征演变的证据。我们的方法提供了在几百毫秒的时间尺度上使用fMRI测量皮层活动变化的可能性。
