Figure 2.

Neighborhood relationships between active orientation-responsive regions across visual cortex. (a) The same OI response map from cat primary visual cortex as shown in Figure 1, with the corresponding neighborhood graph superimposed. Neighbor relationships (white lines) between the active regions (crosses) were calculated using Gabriel graphing (Gabriel and Sokal 1969). The existence of an edge between 2 points on the graph indicates that these points are considered to be neighbors. Only connected vertices are shown. (b) An example functional map from monkey area V1 used in our analysis. (c) The functional map from (b), with the identified active regions (crosses) and corresponding neighborhood graph (white lines) superimposed. Scale bars: 1 mm.