Figure 3.

Nearest neighbor RF profiles for ON and OFF parasol and midget cells. A, For each cell type, the average RF profiles of a cell and its nearest neighbor were computed directly by interpolation of the spatial receptive field (see Materials and Methods). Distance and amplitude were normalized to focus on the RF profile shape independently of absolute size, spacing, and sensitivity. Distance between centers (vertical bars) was normalized for each pair of nearest neighbors (see Materials and Methods). Sensitivity was normalized to have the same variance across cell types (see Materials and Methods). Data are from the preparation shown in Figure 1C. B, Same as A, from a second preparation (temporal equivalent eccentricity 9 mm).