We examine the philosophical and ethical issues associated with conjoined twins and their surgical separation. In cases in which there is an extensive sharing of organs, but nevertheless two distinguishable functioning brains, there are a number of philosophical and ethical challenges. This is because such conjoined twins: 1. give rise to puzzles concerning our identity, about whether we are identical to something psychological or biological;2. force us to decide whether what matters from an ethical point of view is the biological (...) life of our organisms or the existence of our consciousness or mind; 3. raise questions concerning when, if ever, it is morally acceptable to sacrifice one of us to save another;4. force us to reflect on the conditions for ownership of organs and the justification of removal of organs for transplantation which causes the death of the donor; 5. raise questions about who should take decisions about life-risking treatments when this cannot be decided by patients themselves.We examine and suggest answers to these questions. (shrink)

RésuméLes philosophes appartenant à la tradition lockienne considèrent qu'en tant que personnes ou sujets de pensée et d'expérience, nous sommes distincts de nos organismes humains. Cela conduirait, selon des théoriciens qui veulent plutôt nous identifier à ces organismes, à un dédoublement paradoxal des sujets en question. Les objectifs principaux de cet article sont, premièrement, de soutenir à l'encontre de cet argument que la séparabilité des personnes par rapport à leurs organismes peut être comprise d'une manière non paradoxale; et deuxièmement, de (...) souligner qu'il ne faut par inférer de cette séparabilité que nous soyons identiques aux personnes plutôt qu'aux organismes humains. (shrink)

We can start with some science fiction. Here on Earth, I enter the Teletransporter. When I press some button, a machine destroys my body, while recording the exact states of all my cells. This information is sent by radio to Mars, where another machine makes, out of organic materials, a perfect copy of my body. The person who wakes up on Mars seems to remember living my life up to the moment when I pressed the button, and is in every (...) other way just like me. (shrink)