<unk>  is an involuntary flexion or extension of the arms and legs, indicating severe brain injury.  It occurs when one set of muscles becomes incapacitated while the opposing set is not, and an external stimulus such as pain causes the working set of muscles to contract. The<unk>  may also occur without a stimulus. Since<unk>  is an important indicator of the amount of damage that has occurred to the brain, it is used by medical professionals to measure the severity of a coma with the Glasgow Coma Scale (for adults) and the Pediatric Glasgow Coma Scale (for infants).
Abnormal posturing
Hyperreflexia
Gait disturbance
Hypotonia
Dysprosody
Cataplexy
Neuroglycopenia
Shuffling gait