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The brain-in-a-vat is a philosophical thought experiment used in the fields of philosophical skepticism, philosophy of mind, and epistemology. According to this scenario, a human brain is kept biologically alive inside a vat filled with a life-sustaining fluid and is connected to an advanced computer that transmits artificial sensory data directly to its nerve endings. The brain believes that its experiences originate from the external world, whereas everything it perceives is in fact a simulati