Table 1.

Mean RTs (ms) and error rates (%) on compatible and incompatible arrow-target trials for each experiment; and for circle targets, mean RT on compatible and incompatible false alarms (experiment 1), compatible and incompatible free choices (experiment 2), and compatible and incompatible leading hand on bimanual responses (experiment 3), and the corresponding frequency (%) of the incompatible false alarm, free-choice and leading-hand responses, respectively, together with the results of the corresponding statistical analyses (mean difference, 95% confidence interval [CI], t- and p-value). (RTs and error rates on compatible and incompatible trials were compared using paired t-tests; response frequencies were tested against chance level (50%) using one-sample t-tests.)

			experiment 1 (nogo)		experiment 2 (free choice)		experiment 3 (bimanual)
target	measure	condition/statistics	M	SE	M	SE	M	SE
arrow	RT (ms)	compatible	364.0	7.7	336.0	8.7	376.9	8.1
		incompatible	340.9	7.5	322.6	6.9	362.2	6.9
		difference (95% CI)	−23.1	(−15.2 to −31.1)	−13.4	(−5.9 to −20.8)	−14.7	(−8.0 to −21.4)
		t (p)	−6.14	(<0.001)	−3.76	(<0.01)	−4.61	(<0.001)
	error rate (%)	compatible	17.5	1.6	22.5	2.4	5.2	0.9
		incompatible	7.7	1.0	14.4	2.4	2.9	0.9
		difference (95% CI)	−9.7	(−6.5 to −13.0)	−8.1	(−5.4 to −10.7)	−2.3	(−0.6 to 4.1)
		t (p)	−6.31	(<0.001)	−6.25	(<0.001)	−2.87	(<0.01)
circle	RT (ms)	compatible	304.4	17.8	352.7	11.7	383.6	9.3
		incompatible	301.7	17.8	327.3	12.4	382.3	9.5
		difference (95% CI)	−2.7	(−42.9 to 37.5)	−25.4	(−6.0 to −44.8)	−1.3	(−7.0 to 4.4)
		t (p)	−0.14	(>0.8)	−2.74	(<0.05)	−0.48	(>0.6)
	response frequency (%)	incompatible (95% CI)	62.7	(54.4–70.9)	57.6	(55.0–60.1)	48.4	(46.5–50.3)
		t (p)	−3.24	(<0.01)	−6.26	(<0.001)	1.78	(>0.09)