Table 2.
Performance on the color-word Stroop fMRI task across all study participants.
| F (between) | Impaired Insight Cocaine N=15 | Intact Insight Cocaine N=18 | Intact Insight Controls N=20 | |
|---|---|---|---|---|
| Accuracy (all trials) (% correct) | 1.1 | .74 ± .03 | .69 ± .04 | .76 ± .03 |
| Accuracy (congruent trials) (% correct) | 2.8 | .92 ± .02 | .87 ± .03 | .93 ± .01 |
| Accuracy (incongruent trials) (% correct) | 0.6 | .57 ± .06 | .51 ± .07 | .59 ± .05 |
| Accuracy (incongruent – congruent trials) (% correct) | 0.1 | −.35 ± .06 | −.36 ± .06 | −.33 ± .04 |
| Reaction time (all trials) (ms) | 0.1 | 804.5 ± 20.2 | 795.4 ± 16.8 | 797.6 ± 16.7 |
| Reaction time (congruent trials) (ms) | 0.5 | 686.4 ± 20.0 | 707.3 ± 20.4 | 685.3 ± 15.9 |
| Reaction time (incongruent trials) (ms) | 0.8 | 922. 6 ± 25.1 | 883.5 ± 18.5 | 909.8 ± 21.8 |
| Reaction time (incongruent – congruent trials) (ms) | 2.6 | 236.2 ± 20.7 | 176.3 ± 19.8 | 224.5 ± 18.7 |
| Post-conflict slowing (ms) | 0.6 | 968.1 ± 34.7 | 926.1 ± 21.2 | 938.9 ± 24.2 |
| Post-error slowing (all trials) (ms) | 1.5 | 14.8 ± 11.7 | 57.4 ± 20.2 | 46.3 ± 16.6 |
Note. Task accuracy, reaction time, post-conflict slowing (slowing after an incongruent, correct trial), and post-error slowing (slowing after an error) were computed for all participants (see Supplementary Materials for further description). Although no group differences were significant, there was an interesting trend for impaired insight cocaine participants compared with the other groups to show lower post-error slowing (p<0.10), suggested previously as a measure of error awareness93. Overall, however, these behavioral results suggest that the groups were well-matched on task performance, and that the MRI group differences described in the Results are not attributable to differences in task-related motivation or interest. Values are M ± SE.