Thought Experiments

If scientists want to test a theory or principle, they design an experiment; they construct the experiment so that just one variable is tested. In philosophy, we often test our ideas by conducting thought experiments. We construct imaginary cases that allow us to focus on the issue or principle we are most interested in. Often the cases aren't especially realistic, just as the conditions in a scientific laboratory are different from those in the outside world. When you are asked to write about a thought experiment, don't worry about whether it is something that is ever likely to happen; instead, focus on the principle being tested. Suppose that your bioethics teacher has given you this thought experiment to consider:

An elderly, unconscious patient needs a heart transplant. It is very unlikely that a donor heart will become available before the patient dies. The doctor's other option is to try a new and risky procedure that involves transplanting the heart of a genetically engineered chimpanzee into the patient. This will require killing the chimp. What should the doctor recommend?

This scenario may be unrealistic, but your instructor has created it to get you to think about what considerations matter morally (not just medically) when making a life-or-death decision. Who should make such decisions -- doctors, families, or patients? Is it acceptable to kill another intelligent primate in order to provide a heart for a human? Does it matter that the patient is elderly? Unconscious? So instead of focusing on whether or not the scenario is likely to happen, you should make an argument about these issues. Again, see our handouts on argument and thesis statements for help in crafting your position.