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| Condition | Eyes | Support surface | Visual surroundings | Anticipated sensory systems |
|---|---|---|---|---|
| 1 | Open | Fixed | Fixed | Somatosensory |
| 2 | Closed | Fixed | Fixed | Somatosensory |
| 3 | Open | Fixed | Sway referenced | Somatosensory |
| 4 | Open | Sway referenced | Fixed | Vision and vestibular |
| 5 | Closed | Sway referenced | Fixed | Vestibular |
| 6 | Open | Sway referenced | Sway referenced | Vestibular |
