Do you find the comatose to differ from the brain dead and by how much?
If you had to compare euthanasia vs suicide, outside of the obvious shift in responsibility, how do they differ? — Shamshir
There is a huge difference between being in a coma and being brain dead. "Brain dead" means that the brain does not, can not, and will not function again. Both higher brain and brain stem functions have ceased. Once ceased they do not resume. A dead brain is kaput. Coma and vegetative states apply to brains that are still working (even if not very well) and are not always permanent. People often recover consciousness after being in coma, and sometimes after being in vegetative states, even after a long duration. People in persistent vegetative states [PVS] are not brain dead. Some people who have recovered from PVS report that they were aware, but could not execute any communication.
An effort to test whether PVS subjects
could be aware was conducted. fMRI scans on normal subjects had shown that certain kinds of thoughts were detectable; for instance, if the subject was asked to imagine they were playing tennis, a certain pattern of brain activity occurred. When PVS patients were examined in the same way, some, at least, showed exactly the same pattern. They were aware of the test and being told to imagine playing tennis. From these questions yes/no questions were asked of the patient, with 'yes' being imagining tennis, 'no' being thinking of something else.
From this research it was determined that at least some PVS patients are aware.
Suicide and euthanasia are quite different. Turning over the responsibility for one's voluntary death to an agent requires a diagnosis, planning, and various legal rigmarole, as I understand it. On the spur of the moment euthanasia is not legally possible (yet).
Suicide can occur very much on the spur of the moment, or on the spike of despair. If one has a loaded gun handy, it takes just a minute to pick it up, aim, and fire, then
sic transit gloria. That's why guns are so often the means of suicide. Pills take time to accumulate and are not all that reliable. Hanging works quite well, but it requires preparation. Gas, carbon monoxide, bridges, high roofs, water, bleeding, alcohol poisoning, plastic bag on one's head... diverse methods.