On the general topic of ensoulment, I’m curious what people think of the case of “heart in a box” transplant technology. For those that don’t know, this new technology allows for warm, living hearts to be transplanted while remaining in what is essentially their still-living state. The heart continues to beat (it does this through its own vital activity, and is not “pumped”, and is hooked up to a machine with tubes that allow oxygenated blood to flow through the heart. This blood is propelled by the heart’s own inherent pumping activity, and the heart’s cells are kept alive by this same blood that it is pumping. The heart actually has to be “sedated” in order to complete the transplant because it is still functioning when the surgery is performed. Here’s a brief video about this type of transplantation:
Is this heart alive? It certainly is from a biological perspective, and it never “died”, but does it have a soul in the philosophical sense of being alive? If it is alive, what type of soul animates it? If it is a rational soul, how does the soul of the donor continue to animate the heart after it is removed and the rest of their body is “dead”. If it is a vegetative, material soul from what does this soul arise and when does this occur? Are our bodies constantly animated by multiple souls, vegetative, sensitive, and rational? Are material souls “dormant” when a body is animated by a rational soul? If we are animated only by a rational soul, does the donated heart continue to live with a new vegetative soul that takes over for the rational soul once the heart is removed from the rest of the body? When does this occur and can we know the moment of transition?
In traditional philosophy we might say, with Aquinas, that the rational soul replaces the vegetative and sensitive souls through a process of progressive ensoulment, and that in a complete human being the vegetative and sensitive functions of the body are brought about by the rational soul which itself can maintain the functions of the lower souls even though it has utterly replaced them; in the mature human being there is no longer a vegetative and sensitive soul, but just a rational soul that can perform these baser functions in addition to its immaterial, rational operations. Does this traditional approach line up with what we see in the case of the heart? The heart clearly doesn’t have rational operations, so can’t be said to be “fitting matter” for a rational soul, but its life has apparently continued uninterrupted from donor, to box, to recipient. The cells were alive and functioning as part of a rational substance, and they are alive and functioning the same way now. Has the animating principle changed, and will it change again after transplant?
I believe that these are very relevant questions, and I also believe that such new information points to the insufficiency of classical philosophical answers about the soul.