Version May 2024
| Condition | Self-awareness | Sleep-wake cycles | Experience of suffering | Prognosis |
| Persistent vegetative state | Absent | Intact | No | Depends upon cause |
| Coma | Absent | Absent | No | Usually recovery, persistent vegetative state or death in 2 to 4 weeks |
| Brain death | Absent | Absent | No | No recovery |
| Locked-in syndrome | Present | Intact | Yes | Recovery unlikely, persistent quadriplegia with prolonged survival possible |
| Akinetic mutism | Present | Intact | Yes | Recovery very unlikely (depends on cause) |
| Dementia | Present, but lost in late stages | Intact | Yes, but lost in late stages | Irreversible (ultimate outcome depends on cause) |
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