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Fig. 13.11. Contour segmentation performance. The average correlation coefficients between two MUA sequences within the same contour, across different contours, between contour and background, and within the background are plotted, calculated over two trials. The error bars indicate ±1 SEM. The MUA sequences within the same contour are highly correlated, whole those belonging to different contours or the background are not (the difference is significant with p < 10^-10). This result demonstrates quantitatively that neurons within each contour form a synchronized group, whereas neurons responding to different contours are desynchronized.