| Inclusion Criteria |
SDMT | 1.282 SD or more below published normative data (10th percentile). |
 | Exclusion criteria |
Visual Acuity | Corrected near vision worse than 20/70 (to see the test materials). Severe nystagmus according to neurologist ratings. |
The Beck Depression Inventory | Score ≥ 29 (indicative of severe depression) |
Token test | Score ≥ 29 indicative of intact verbal comprehension |
MRI sites only | Failing the standard MRI screening form |