Brain in a vat

Brain in a vat is a thought experiment that imagines what it would be like if our brains were taken out of our bodies and placed into vats of liquid that kept them alive. In this scenario, the brains are connected to a computer that provides them with all the sensory input they would experience if they were still in their bodies and living in the normal world. The computer would also control the brain's responses to that input. This means that the brain in the vat would experience the world as if everything were normal, even though its body isn't connected to it anymore.