Table 2 Go/Nogo-Task Performance (Boys only)

Measure Healthy
Comparison
N = 15
Tourette
Syndrome
N = 20
repeated measure ANOVA
Mean (SD) Mean (SD)
Success rate (%) b    Letter: F(2,66) = 247.3**, (X > B**, A > B**)
Go (X)c 98 (1.8) 97 (2.1)
Go (A)d 98 (2.1) 98 (2.4)
Nogo (B)e 61 (17.1) 60 (11.7)
Reaction time of correct
responses (ms) b
Letter: F(1,33) = 66.8**, (A > X**)
Go (X) 401 (106) 378 (44)
Go (A) 438 (106) 403 (59)
Reaction-time of errors compared to correct
Go (A) (ms) f
Letter: F(1,33) = 10.8**, (A > B**)
Correct Go (A) 434 (106) 404 (59)
Error in Nogo (B) 372 (203) 347 (87)
Reaction-time variability (ms)    Letter: F(1,33) = 13.2**, (A > B**)
Go (X) 109 (34) 118 (35) Run*Group: F(2,66) = 2.8+
Go (A) 137 (39) 133 (49) Run*Letter: F(2,66) = 3.2*
1. a only effects with p < .10 are reported
2. b marginal means across runs and standard deviations of factor "Group"
3. c Go (X) was frequent (4/6 of all trials)
4. d Go (A) was infrequent (1/6 of all trials)
5. e Nogo (B) was infrequent (1/6 of all trials)
6. f reaction-times of all three runs collapsed into a grand mean, thus slight differences to the marginal means reported for analysis of 'Reaction time of correct responses (ms)' emerge.
7. + p < .1
8. ** p < .01 