What is this "test of sentience"? I don't recall ever stating that there was any such definitive test.
Again, thinking is a necessary condition for sentience, therefore an entity that does not think cannot be sentient. Seeing as how there is no set of sufficient conditions for determining sentience, we must use the necessary conditions as sufficient conditions until additional conditions can be qualified. You have implied that there is some sort of test that provides necessary and sufficient conditions for determining sentience, but you'll need to substantiate this implication.
The ability to become a rights-bearing entity does not make one a rights-being entity.
It's like a doctor who is not currently practicing. The doctor remains a doctor because of his qualifications. In this sense, the unborn child already possesses the qualifications, but is not currently practicing.
The same criteria employed in determining whether a patient is brain-dead, i.e., no electrical activity and/or no blood flow. Lack of a brain in, e.g., the zygote or embryo, would constitute non-functionality.
Do you propose that there is a means of determining whether a thinking entity as a "self concept?" What tests accomplish this feat?
This is a strawman. An infant being denied the right to vote does not in and of itself justify the infant being denied the right to life.
This is an absurd conclusion merely because you are treating rights as an all-or-nothing affair, which they clearly are not (unless you propose to give infants the right to vote and serve in the military).
If a person is a "rights-bearing entity," is the only satisfactory operationalization of the term "person," then an entity with more rights will be "more of a person" than an entity with fewer rights. However, if entity A is "less of a person" than entity B, then this does not presuppose that entity A has no rights.
You don't assign infants the right to vote despite the fact that they may eventually reach the age of 18, so why do you assign embryos the right to life based on the fact that they may eventually become sentient?
This "fully persons" term is bogus. If a person is a "rights-bearing entity," then nobody (except perhaps some sort of god-emperor) is a "full person," because nobody has, e.g., the right to kill indiscriminately.

For example, imagine that you've undergone a radical surgical procedure to cure you of some terrible illness, whereby your brain has been separated from the rest of your body. Your brain is kept alive, is fed stimuli, and has a limited ability to interact with its environment (e.g., through a speech machine). Your body is also kept alive, and is hooked up to a simple machine that stimulates its muscles so as to prevent them from atrophying.
Which entity, the brain-ben or the body-ben, is "you"? And why? If the answer is "neither," then were did you go?
You have hit on an important question, as to how much of my body can I lose and still be me? Suppose I have my arm cut off. I am still me, even without my arm. And so on, all the way down to what I need to live.
One cannot do without a heart, or a circulatory system of some sort. Thus, the brain cannot survive without the body, nor can the body survive without the brain.
In seperating the two, you have killed me, in that the two exist apart from each other, in that what is usually essential for the brain to live, a circulatory system is not longer present, and the body no longer has the brain to give the body instructions.
I hope you find this explanation sufficient. Though you may be able to keep my brain alive, the brain is no more me, than the lump of flesh that is my body can be me without the brain.
This is different in the case of a coma, where the person may recover. If you were able to join the two together, without ill effects, then the case would be like open heart surgery. I would be clinically 'dead' until my heart has been placed back inside. It would be no more right to keep the heart from the patient, then it would be to keep the body from the brain.
Where would I go? I would return to the inert state. Just as the combination of sperm and egg when fused spark life, so would I revive when the body and brain were brought back together.
Now, let's put the ball back in your court. How would you answer this question? Would it be right to cage a brain in a jar because you would still be keeping the person alive?
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