Fig. 4.

Encoding of relative size in IT neurons. A: distribution of significant effects in an ANOVA performed on each set of 4 versions (103 neurons × 12 objects = 1,236 cases) with large and small part size as factors. B: for interaction effects (n = 120), the average absolute difference in firing rate (70–270 ms) is plotted for each pair of versions. Version labels are given in the plot below. Statistical significance: *P < 0.05, **P < 0.005, etc. C: multidimensional scaling plot representing the same data as in B. In the plot, versions that evoked similar activity are placed nearby. The fish versions are shown for illustration, but the data are derived from all interactions across shapes. Values at bottom left of the plot indicate the correlation between the observed firing rate differences and the 2-dimensional (2D) plot coordinates. The high correlations show that the 2D plot is an accurate visualization of the actual firing rate differences. Note that all statistical analyses in B are based on the observed firing rate differences and this plot is only for visualization purposes. D and E: plots similar to B and C but for cases with only main and no interaction effects (n = 247). F and G: plots similar to B and C but for all the cases (n = 1,236).