That doesn't address the shades of grey where a human being with very low levels of mental faculties is still treated with greater respect than clever chimps. My gut tells me, as I'm sure it does many people, that a human zygote with no brain at all is more special than a booger I peel out of my nose.
Just because certain factions of society might be more confident in saying what makes a person doesn't mean they are any more accurate.
Just because one applies scientific methods to the question of personhood doesn't mean their answer is better. You'd have to convince me that scientists have been working on questions less immune to empiricism than "what makes a person".
More importantely "personhood" doesn't even have it's own Wikipedia page. What does that tell you? Hmmmmmmm?
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