Felix, a macaque monkey, was trained to do certain tasks by Oxford University researchers by being deprived of food and water. He then had the top of his head sliced off and electrodes inserted into his brain before being killed.
Felix suffered these debilitating and painful procedures in the name of Parkinson's disease research. However macaque monkeys don't get Parkinson's disease. The best vivisectors can do is brain damage them and give them similar symptons - a far cry from the disease in people.