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. Author manuscript; available in PMC: 2017 Aug 11.
Published in final edited form as: Neuron. 2009 Sep 24;63(6):902–915. doi: 10.1016/j.neuron.2009.09.006

Figure 5. Structural versus semantic encoding models.

Figure 5

A, The left panel compares the accuracy of the structural encoding model (x-axis) versus the semantic encoding model (y-axis) for every voxel within the slice coverage (subject TN). Here accuracy is defined as the correlation (cc) between the response observed in each voxel and the response predicted by each encoding model for all 120 images in the image reconstruction set. The distribution of points has two wings. One wing extends along the y-axis and another extends along the x-axis, indicating that very few voxels are accurately predicted by both models. The voxels whose responses are accurately predicted by the structural model but not the semantic model are shown in blue (cc > 0.353, p < 3.9*10-5; see Experimental Procedures for criteria used to set this threshold). The voxels whose responses are accurately predicted by the semantic model but not the structural model are shown in magenta (same statistical threshold as above). Most voxels are poorly predicted by both models (gray), either because neither model is appropriate, or because of poor signal quality. The right panel shows flat maps of the left and right hemispheres of this subject. Visual areas identified using a retinotopic mapping procedure (see Experimental Procedures) are outlined in white. Voxels whose responses are accurately predicted by the structural (blue) or semantic (magenta) models are plotted on the flat maps (the few voxels for which both models are accurate are shown in white). Most structural voxels are located in early visual areas V1, V2 and V3. Most semantic voxels are located in the anterior portion of lateral occipital (labeled LO), and in the anterior occipital cortex. B, Data for subject KK, format same as in A. Most structural voxels are located in early visual areas V1, V2 and V3. Semantic voxels are located in the anterior occipital cortex. C, Data for subject SN, format same as in A and B. Structural voxels are located in early visual areas V1, V2 and V3. Semantic voxels are located in the anterior occipital cortex.