Table 2. Behavioral measures for each participant group in the two neurophysiological tasks.
Values expressed as mean (SD). Reaction times (RT) and post-stop-error slowing are expressed in milliseconds. Statistical comparisons were conducted using independent samples t-tests.
| MS patients | Controls | t value (df = 56) | p value | |
|---|---|---|---|---|
| Stop Task | ||||
| Total responses | 585 (41) | 586(26) | -0.128 | 0.898 |
| Percentage of correct choice responses | 95.0 (4.6) | 93.4 (5.2) | 1.270 | 0.209 |
| a RT correct choice responses | 474 (53) | 460 (55) | 1.020 | 0.312 |
| b RT corrected choice errors | 300 (145) | 279 (174) | 0.472 | 0.638 |
| Percentage stop signal commission errors | 48.7 (14.4) | 47.0 (16.5) | 0.413 | 0.681 |
| Post-stop-error slowing | 44 (41) | 34 (41) | 0.912 | 0.366 |
| a RT incompatible—compatible trials | 29 (13) | 31 (16) | -0.594 | 0.555 |
| % Errors incompatible—compatible trials | 3.35 (4.45) | 5.96 (5.76) | -1.908 | 0.062 |
| Auditory oddball task | ||||
| Percentage non-responded targets | 10.47 (9.84) | 12.73 (19.87) | -0.538 | 0.593 |
| Percentage responded novel stimuli | 4.23 (3.56) | 3.69 (3.09) | 0.603 | 0.545 |
*p<0.05
aRT: reaction time
bRT corrected errors: the reaction time taken to correct an erroneous response