The Stanford Encyclopedia of Philosophy defines skepticism as denial or doubt of a particular belief, fact, or action. Skepticism deals primarily with questioning knowledge from an opposing perspective and refrains f...
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...lse. Since the argument says one cannot know whether one is a brain in a vat, then one cannot know whether most of one's beliefs might be completely false. So, since it is impossible to rule out oneself being a brain in a vat, there cannot be good grounds for believing any of the things one believes and the skeptical argument argues that one certainly cannot know them, raising issues with the definition of knowledge. I disagree with Putnam’s refutation of skepticism because the Brains in a Vat concept does not work. As a brain will never be able to function solely and react to impulses being controlled by a mad scientist, the idea becomes unrealistic for me to conceptualize. Skepticism simply questions the validity of how knowledge is established. It simply asks the question why and offers doubt when many of the assertions made by Putnam are unrealistic in reality.
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