FIG. 3.

Discrimination-performance–based similarity shows relative stability over time at most sites. A: plot of across-recording block performance, where the discrimination performance was calculated between the responses from the 1st recording block and the responses from each subsequent recording block at a particular site plotted against the time elapsed after the start of the 1st recording block obtained at the same site. To the right, a histogram shows the same data in bins of 5%. B: comparison of within-recording block performance to across-recording block performance, with a best-fit line plotted in black. The correlation coefficient was 0.95 (P < 0.001). The values of performance for the example data shown in Figs. 1 and 2, A–D are outlined in red.