Different Spatial Scales of Shape Similarity Representation in Lateral and Ventral LOC
Different Spatial Scales of Shape Similarity Representation in Lateral and Ventral LOC
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DOI：
10.1093/cercor/bhn244
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发表时间：
2009-10-01
期刊：
影响因子：
3.7
通讯作者：
Aguirre, Geoffrey K.
中科院分区：
文献类型：
--
作者：
Drucker, Daniel M.;Aguirre, Geoffrey K.
我们研究了一组参数化形状的刺激相似性和枕叶外侧复合体（ESTA）使用结转功能磁共振成像设计的子区域内的神经表征的空间尺度之间的关系。在腹侧，而不是侧腹，线性恢复适应成比例的形状差异。与此相反，分布的神经模式和刺激的相似性，观察到一个很强的对应关系，而不是在腹侧丘脑。此外，腹侧腹侧体素被发现是广泛的调整，并代表刺激相似性的所有方面，而横向腹侧体素被狭隘的调整，并优先表示的形状小功能，而不是他们的方向内的形状。结果表明，粗的空间编码的形状特征在侧腹的整个形状空间内的更集中的编码，可能与对象处理的层次模型。
We investigated the relationship between stimulus similarity for a set of parameterized shapes and the spatial scale of neural representation within subregions of the lateral occipital complex (LOC) using a carryover functional magnetic resonance imaging design. In ventral but not lateral LOC, a linear recovery from adaptation proportional to shape dissimilarity was seen. In contrast, a strong correspondence of the distributed neural pattern and stimulus similarity was observed in lateral LOC but not ventral LOC. Further, ventral LOC voxels were found to be broadly tuned and represent all aspects of stimulus similarity, whereas lateral LOC voxels were narrowly tuned and preferentially represented the shape of small features rather than their orientation within the shape. The results, indicating a coarse spatial coding of shape features in lateral LOC and a more focused coding of the entire shape space within ventral LOC, may be related to hierarchical models of object processing.