Table 1.

Mean of medians and SD (in parentheses) reaction times (ms) for each combination of the internally- and externally generated event conditions

	Probability of internally generated event
	0%	30%	60%	90%	Overall
Probability of externally generated event
0%	532.23 (51.61)	527.03 (48.05)	523.52 (49.84)	521.82 (52.39)	526.15 (50.47)
30%	518.33 (62.04)	521.32 (64.97)	531.85 (68.42)	523.31 (63.29)	523.70 (64.68)
60%	526.07 (60.96)	523.71 (58.19)	518.16 (51.93)	527.95 (61.34)	523.97 (58.11)
90%	521.08 (67.64)	513.52 (67.37)	524.79 (64.54)	517.87 (66.55)	519.32 (66.53)
Overall	524.43 (60.56)	521.40 (59.65)	524.58 (58.68)	522.74 (60.89)