Absolute shift amplitude, tuning bandwidth and diversity of orientation tuning for homogeneous vs. non-homogeneous sites. Homogeneous sites are cell clusters that display all-attractive or all-repulsive shifts of orientation tuning. Non-homogeneous sites consist of cell clusters that display attractive and repulsive shifts. Absolute shift amplitude (left) is not significantly different (P = 0.4294, Wilcoxon two-sided rank sum test) but the shift amplitude variance is significantly larger for non-homogeneous sites in comparison to homogeneous sites (P = 0.002, Levene's homoscedasticity test). Tuning bandwidth (center) and diversity of orientation tuning (right) are both significantly larger for non-homogeneous sites (Wilcoxon rank sum test, P < 0.001). Error-bars are ± 1 S.E.M.