Figure 2.

Outline of experiments and analyses is illustrated. Ideally, pooling should be explored in the four-dimensional space (X, Y, SF, OR) as shown in figure 1. However, simultaneous exploration of this space is impossible due to the prohibitive number of conditions. Thus, we partitioned the experiment into two subspaces: (X, SF) and (Y, OR). (a) Pooling estimation in the (X, SF) subspace, i.e. in SF domain and X space domain. For this purpose, reverse correlation analysis is performed to obtain a binocular SF interaction map (b) and a binocular spatial interaction map (c) simultaneously. Spike data are correlated with dichoptic SF grating stimuli. The elongation along the 45° diagonal in each domain is the key for estimating the degree of pooling. (d) Pooling estimation in the (Y, OR) subspace, i.e. in OR domain and Y space domain. Here, reverse correlation analysis is performed to obtain a binocular OR interaction map (e) and a binocular spatial interaction map (f) simultaneously in an analogous manner to those in the (X, SF) domain.