Table 1.

Performance characteristics

		Stop‐signal probability
Trial type		LSP (20%)	HSP (40%)	t‐value	P‐value
Go	% Errors	0.99 (2.2)	0.53 (1.4)	1.122	0.223
	% Outliers	0.78 (0.6)	0.99 (0.7)	−1.025	0.317
	GoRT (ms)	13.95 (11.9)	19.85 (16.0)	−3.255	0.004
	GoRT Variability (ms)	31.92 (5.9)	36.35 (7.9)	−4.166	<0.001
Stop	Stop fail RT (ms)	−6.07 (10.8)	−1.83 (11.2)	−2.139	0.044
	% Inhibit	48.39 (1.7)	49.37 (1.4)	−3.210	0.004
	SSRT (ms)	188.52 (8.4)	188.21 (9.5)	0.168	0.869

GoRT and Stop fail RT are expressed relative to the target (i.e., response – 800 ms). Early response times (>400 ms before the target) were considered errors and response times more than 3 SD from mean GoRT were defined as outliers. Mean (± standard deviation) and two‐tailed paired sample t‐tests are reported.