Table 1.

Update latencies in individual recording sessions

	Rat	Delay (msec)	Trials
Firing rate increase	1	83  ± 22	8
	1	74  ± 5	5
	1	75  ± 21	5
	3	70  ± 21	5
	3	167  ± 20	8
	4	86  ± 51	4
	(All	92  ± 64	44)
Firing rate decrease	1	90  ± 17	7
	1	141  ± 41	4
	3	142  ± 34	5
	4	100  ± 13	3
	4	96  ± 38	4
	(All	117  ± 80	31)

HD cells providing data suitable for analyses (as described in Materials and Methods) recorded during three or more trials within the same session were selected for each rat. Single-trial estimates of update latencies were then computed. Average latencies (±SEM) are displayed for each rat and each session. Average latencies computed over all trials are also shown for reference (including trials from sessions in which only one or two trials were analyzable; two outliers were removed). These were consistent with estimates obtained from cumulative response histograms.