Table 1. Summary of descriptive statistics.

Trial type	Duration (ms)	N	Median relative latency (ms)	Average relative latency (ms)	Average absolute latency (ms)	STD	Variance (ms2)	CV
Target (r)	400	588	254	282	682	124	15346	0.18
	900	629	212	235	1135	97	9343	0.09
	1400	576	199	225	1625	98	9600	0.06
	1900	519	202	228	2128	90	8060	0.04
Target (b)	400	1089	164	171	571	78	6059	0.14
	900	1059	175	190	1090	79	6292	0.07
	1400	1093	193	208	1608	78	6114	0.05
	1900	1098	188	202	2102	63	3922	0.03
Cue&targ (r)	400	878	204	218	618	90	8068	0.15
	900	819	191	206	1106	65	4242	0.06
	1400	811	191	205	1605	64	4049	0.04
	1900	800	191	203	2103	64	4042	0.03
Cue&targ (r)	400	331	67	84	484	176	31099	0.36
	900	314	64	41	941	213	45560	0.23
	1400	326	−88	−116	1284	330	109066	0.26
	1900	326	−149	−218	1682	531	153817	0.32
Probe (r)	400	334	88	132	532	230	52823	0.43
	900	299	91	105	1005	311	96824	0.31
	1400	345	−49	−51	1349	381	145535	0.28
	1900	310	−192	−225	1675	461	212078	0.28

Group data of all subjects. N, sample size; STD, standard deviation, CV, coefficient of variation (STD/mean absolute latency); (r), randomized durations blocks of trials, variable foreperiod; (b), single duration blocks of trials, fixed foreperiod. Bold type is used to indicate trials collected in blocks with P(probe) = 0.5.