[I]f things emerged from a spaceship which we could not be sure were machines or conscious beings, what we were wondering about would have an answer … - Thomas Nagel

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[I]f things emerged from a spaceship which we could not be sure were machines or conscious beings, what we were wondering about would have an answer even if the things were so different from anything we were familiar with that we could never discover it. It would depend on whether there was something it was like to be them, not on whether behavioral similarities warranted our saying so. … [W]e need … to ask whether experience is present in [the] alien thing[s], … whether there is something it is like to be them, and … the answer to that question is what determines whether they are conscious.

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About Thomas Nagel

Thomas Nagel (born 4 July 1937) is an American philosopher. He is University Professor of Philosophy and Law, Emeritus, at New York University, where he taught from 1980 to 2016. His main areas of philosophical interest are legal philosophy, political philosophy, and ethics.

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Additional quotes by Thomas Nagel

The distance between oneself and other persons and other species can fall anywhere on a continuum. Even for other persons the understanding of what it is like to be them is only partial, and when one moves to species very different from oneself, a lesser degree of partial understanding may still be available. The imagination is remarkably flexible. My point, however, is not that we cannot know what it is like to be a bat. I am not raising that epistemological problem. My point is rather that even to form a conception of what it is like to be a bat and a fortiori to know what it is like to be a bat, one must take up the bat's point of view.

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What is more subjective is not necessarily more private. In general it is intersubjectively available. I assume that the intersubjective ideas of experience, of action, and of the self are in some sense public or common property. That is why the problems of mind and body, free will, and personal identity are not just problems about one's own case.

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