Final answer:
Decorticate and decerebrate posturing are abnormal movements seen in patients with brain injuries or diseases.
Step-by-step explanation:
The terms 'decorticate' and 'decerebrate' are used in the context of neurology to describe abnormal posturing or movements. Decorticate posturing is characterized by flexion of the arms and wrists, while decerebrate posturing involves extension and rigidity of all four limbs. These abnormal postures reflect damage to different areas of the brain, and they can be seen in patients with certain brain injuries or diseases.