In philosophy the brain in a vat biv alternately known as brain in a jar is a scenario used in a variety of thought experiments intended to draw out certain features of human conceptions of knowledge reality truth mind consciousness and meaningit is an updated version of ren descartess evil demon thought experiment originated by gilbert harman. The brain in a vat argument the brain in a vat thought experiment is most commonly used to illustrate global or cartesian skepticismyou are told to imagine the possibility that at this very moment you are actually a brain hooked up to a sophisticated computer program that can perfectly simulate experiences of the outside world. P2 no brain in a vat in an otherwise empty world can think that water is wet c i am not a brain in a vat 1998 78 warfield explains that an otherwise empty world is a world containing only the brain in a vat and whatever is necessary to sustain the brain in a vat 1998 77. The brain in a vat story above was given by the american philosopher hilary putnam in his 1981 book reason truth and history however this is not a new problem asking whether there is an escape from the vat is no different to asking whether the prisoners can escape from platos cave of illusion putnams brain in a vat is a modern version
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