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It may be necessary in some cases to exclude sensations of zero intensity from consideration here and elsewhere for reasons analogous to those which previously led us to defer our consideration of subliminal intervals till after supraliminal intervals had been discussed.* Cf. the discussion of indistinguishability and genuine identity in the introduction and Studies in Synthetic Logic.* I speak as if we were able to measure sensations at this stage, although in fact we are not, since to express this point in strictly exact language would involve an intolerable and confusing prolixity.
Norbert Wiener (Sat,) studied this question.