Decorticate rigidity
Decorticate posturing indicates damage to areas including the cerebral hemispheres, the internal capsule, and the thalamus.
(higher centers that modulate rubrospinal tract damaged → flexors response);
Decerebrate rigidity
Decerebrate posturing indicates brain stem damage, specifically damage below the level of the red nucleus (e.g. mid-collicular lesion)
(rubrospinal tract is out → extensors response)