Cortical regions involved in perceiving object shape
Cortical regions involved in perceiving object shape
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DOI：
10.1523/jneurosci.20-09-03310.2000
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发表时间：
2000-05-01
影响因子：
5.3
通讯作者：
Kanwisher, N
中科院分区：
文献类型：
--
作者：
Kourtzi, Z;Kanwisher, N
此处描述的研究使用功能磁共振成像来测试常见或独特的认知和/或神经机制是否参与从定义对象形状的不同图像提示中提取物体结构，例如轮廓，阴影和单眼深度提示。我们发现，对于由不同的视觉提示定义的物体（例如，灰度表照片和线条图）定义的对象，在外侧和腹侧枕皮层和腹侧枕皮层中的重叠激活（称为外侧枕骨）。在第二个实验中，当重复对象时，我们发现响应降低，而与它们以相同或不同格式出现（即灰度图像与线图）无关。第三个实验表明，对于由轮廓或单眼深度提示定义的三维形状的LOC的激活，例如遮挡，而不是二维形状，这表明这些区域与处理三维形状无参与信息。这些结果表明，LOC中的常见区域参与从不同图像提示中提取和/或表示对象结构的信息。
The studies described here use functional magnetic resonance imaging to test whether common or distinct cognitive and/or neural mechanisms are involved in extracting object structure from the different image cues defining an object's shape, such as contours, shading, and monocular depth cues. We found overlapping activations in the lateral and ventral occipital cortex [known as the lateral occipital complex (LOC)] for objects defined by different visual cues (e.g., grayscale photographs and line drawings) when each was compared with its own scrambled-object control. In a second experiment we found a reduced response when objects were repeated, independent of whether they appeared in the same or a different format (i.e., grayscale images vs line drawings). A third experiment showed that activation in the LOC was no stronger for three-dimensional shapes defined by contours or monocular depth cues, such as occlusion, than for two-dimensional shapes, suggesting that these regions are not selectively involved in processing three-dimensional shape information. These results suggest that common regions in the LOC are involved in extracting and/or representing information about object structure from different image cues.