Table 4.

Pearson product-moment correlations between mean P300 amplitudes measured at Cz.

	Cue-locked early P3	Cue-locked late P3	1st target P3	3rd target P3
Switch task (N = 17)
Cue-locked early P3	1.00	0.75**	0.66**	0.79**
Cue-locked late P3	-	1.00	0.54*	0.76**
1st target P3	-	-	1.00	0.73**
NoGo task (N = 16)
Cue-locked early P3	1.00	0.51*	0.76**	0.86**
Cue-locked late P3	-	1.00	0.59*	0.78**
1st target P3	-	-	1.00	0.82**
Oddball task (N = 17)
Cue-locked early P3	1.00	0.54*	0.51**	0.35 ns
Cue-locked late P3	-	1.00	–0.07 ns	–0.25 ns
1st target P3	-	-	1.00	0.62**
Across all tasks (N = 50)
Cue-locked early P3	1.00	0.76**	0.44**	0.67**
Cue-locked late P3	-	1.00	0.21 ns	0.52**
1st target P3	-	-	1.00	0.68**

*P < 0.05.

**P < 0.01 (2-tailed).