Table 3.
Stop signal task behavioral performance. Go RT = mean correct go reaction time; Failed stop RT = mean reaction time on failed stop trials; Go Discrimination error = percent discrimination errors on go trials; Go omission error = percent omission errors on go trials; Prob. Stop overall = probability of stopping on stop trials overall; Prob. Stop after convergence = probability of stopping on stop trials after convergence; Overall SSD = mean stop signal delay overall; Convergence SSD = stop signal delay after convergence; SSRT = stop signal reaction time.
| Controls | Patients – ON Stim. | Patients – OFF Stim. | |
|---|---|---|---|
| Go RT (ms) | 606(143) | 624(144) | 650(166) |
| Failed Stop RT (ms) | 522(127) | 550(127) | 554(137) |
| Go Discrimination error (%) | 0.3(0.5) | 2.5(4.1) | 1.9(2.9) |
| Go Omission error (%) | 0.6(1.1) | 3.4(7.3) | 2.8(5.6) |
| Prob. Stop overall (%) | 54.5(4.8) | 53.8(3.9) | 54.2(6.1) |
| Prob. Stop after converge (%) | 51.2(6.4) | 50.5(2.6) | 51.1(3.7) |
| Overall SSD (ms) | 330(127) | 322(135) | 313(137) |
| Convergence SSD | 350(145) | 341(155) | 338(180) |
| SSRT* | 256(39) | 283(51) | 311(62) |
*
ON vs OFF: t(12)= 2.4, p =0.033, controls vs ON: t(25) = 1.6, p=0.12, controls vs OFF: t(25)=2.8, p=0.009