Figure 6.

Illustration of the resampling process used to compare patch-labeling injections with OI response maps. An example injection reconstruction from our database is shown in a. An injection of biotinylated dextran amine (central hashed region) was made into macaque monkey V1 by Tanigawa and colleagues (reproduced with permission from Tanigawa et al. 2005; scale bar: 1 mm). We located the center of the reconstructed patches and identified the neighborhood graph as described above (black circles and connecting lines). We constructed the convex hull of the labeled patches (b), then superimposed this hull onto a set of active regions identified from an OI response map (c). Using the hull as a mask, we excluded active regions and neighbor relations falling outside this region (gray crosses: d). In this way, we imposed the shape of a patch group onto the structure of an OI response map, ensuring that any potential distortions in our characteristic measures caused by the shape of a set of points were included equally in both data sets. The points and neighbor relations that remained after masking were used to compare the spatial arrangement of the OI response maps with that of the patch-labeling injections.