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> At what point did it become a thing?

Early on and for obvious reasons - it is pretty easy to observe in oneself, much easier than discovering electrons. ;)

But its also pretty hard to observe in others, which makes it hard to come up with a satisfying definition. Without a concrete definition, you can't really do science with it.

Alan Wallace wrote a short essay on this subject titled The Taboo of Subjectivity. It is available online for free, if you are curious.

Yes, but that's exactly what I meant - the idea is prescientific.

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