Clinical criteria for PVS will clearly need to be revised in the light of this information. However, this research does not answer deep ethical questions about what should be done. These patients have profound brain injuries and their lives are extremely restricted. How will we evaluate their desires? What should we do if they wish to die? We will still need to do the ethical work to evaluate the implications of what they want, particularly whether they wish to live or die. This is one step towards an answer to the question of how we should care for people with severe brain injuries, but it is not the solution. Not only do we need to know what they want, we also need to know how limited medical resources should be fairly distributed and what constitutes a rational desire to die.