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Timeline of enrollment and schedule of assessments.
| Data Collection Measures | Year 1 | Year 2 | Year 3 | Year 4 |
| Screening and recruitment | Xa | X | —b | — |
| Unified Parkinson Disease Rating Scale -III (motor section) | X | X | X | X |
| Saliva samples for genetics | X | — | — | — |
| Neuropsychological and behavioral measures | X | X | X | X |
| fMRI Cognitive activation paradigm | X | — | — | — |
| Structural MR, rs-fMRI & DTI | X | X | X | X |
aDenotes time points when data collection is active.
bNot applicable.
