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Table 1 FOUR score [19] with permission

From: Neurocritical care update

Eye response  
 4 Eyelids open or opened, tracking, or blinking to command
 3 Eyelids open but not tracking
 2 Eyelids closed but open to loud voice
 1 Eyelids closed but open to pain
 0 Eyelids remain closed with pain
Motor response  
 4 Thumbs-up, fist, or peace sign
 3 Localizing to pain
 2 Flexion response to pain
 1 Extension response to pain
 0 No response to pain or generalized myoclonus status
Brainstem reflexes  
 4 Pupil and corneal reflexes present
 3 One pupil wide and fixed
 2 Pupil or corneal reflexes absent
 1 Pupil and corneal reflexes absent
 0 Absent pupil, corneal, and cough reflex
Respiration  
 4 Not intubated, regular breathing pattern
 3 Not intubated, Cheyne–Stokes breathing pattern
 2 Not intubated, irregular breathing
 1 Breathes above ventilator rate
 0 Breathes at ventilator rate or apnea
  1. FOUR full outline of unresponsiveness