Cats are frequently used in neurology research to study spinal cord injury, as well as problems related to vision, sleep, and hearing, and continued to be used because so much is known about their neurological functions. This type of research is extremely invasive, and almost always results in the euthanasia of the cats after they are subjected to grueling vivisection procedures. They can also used to study Parkinson’s disease, cancer, genetic disorders, and other human conditions and ailments