Locked-in syndrome is an almost complete paralysis of the body, despite the consciousness and cognition
being intact. It is as if the patient is trapped in their body. They cannot express emotions, speak, or move. Only the eyes and eyelids remain partially mobile. The senses are intact, including touch, and pain
sensation persists. It is usually caused by stroke
or trauma injuring the brainstem
. The passage of nerve messages is interrupted to and from the brain.