Twin Earth Puzzle

Twin Earth is a thought experiment by philosopher Hilary Putnam, first in his paper “Meaning and Reference” (1973), and then in his paper “The Meaning of ‘Meaning'” (1975), to illustrate his argument for semantic externalism, or the view that the meanings of words are ultimately not purely psychological. The Twin Earth thought experiment was one of three, the other two being the Aluminum-Molybdenum, and the Beech-Elm cases. Since the publication of these cases, philosophers have proposed numerous variations on the experiment. Source.

Dear Colleagues,

I’m conducting a new trial run of philosophical intuitions on five overall thought experiments that include Twin Earth, Moral Twin Earth, and 3 new scenarios.  At this time, the survey only is for anyone with a PhD or doctorate in philosophy.  I greatly appreciate your help on this.
This trial is different from the one I previously released about a month or so ago and is shorter, so if you took the previous survey, please feel free to also take this variant.
If you can’t finish the first time, click on the link again from the same device to take you back to where you left off.  Thanks, and enjoy!
John J. Park
Clemson University

Philosophy & Religious Studies Department

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