Table 1.
Behavioral data
| Trial description | Measure | Value |
|---|---|---|
| Critical direction | ||
| Go a | Reaction time | 465 (85) ms |
| StopInhibit | % Inhibition | 54 (11.5) % |
| StopRespond | Reaction time | 416 (49) ms |
| Noncritical direction | ||
| Go | Reaction time | 375 (44) ms |
| StopInhibit | Number of omissions | 0.53 (0.64) |
| StopRespond b | Reaction time | 416 (51) ms |
| Go | STDEV of reaction time | 60.8 (17.8) |
| StopRespond c | STDEV of reaction time | 103.4 (32.7) |
| Other variables | ||
| Go discrim. errors | Number of errors | 2.7 (2.5) |
| Mean SSD | Time | 199 (101) |
| SSRT | Reaction time | 266 (53) |
Values shown are means and SDs (in parentheses). Mean SSD refers to the average stop-signal delay, computed from four staircases (see Materials and Methods) and the point at which p(inhibit) = ∼0.5. The SSRT is computed for each subject as Go_critical − meanSSD. discrim., Discrimination.
aGo_critical is significantly slower than Go_noncritical (p < 0.001).
bStopRespond_noncritical is significantly slower than Go_noncritical (p < 0.001).
cStopRespond trials were significantly more variable than Go trials in the noncritical direction (p < 0.001).