Mean SI of cells pairs for the initial optimal (n = 82) and the adapting (n = 52) orientation in the three experimental conditions (error bars are SEM). (A) A significant increase of the mean SI is observed after adaptation for the initial optimal orientation; paired sample two-tailed t-test, p < 0.001. The underneath scatter plots shows that synchrony increases in 65% of cases, 53/82 SI values are above the equality line (broken line). (B) No changes were observed across conditions for the adapting orientation. The underneath scatter plot indicates that SI values are uniformly distributed along the equality line.