The Brain in a Jar

There is a rather nutty theory in Science and Philosophy known as the Brain in a Vat or the Brain in a Jar theory. In this thought experiment, we imagine a mad scientist creating a machine into which he can place a human brain. This machine is called a “brain vat”. The brain vat keeps the brain alive, and it also allows the scientist to create virtual stimuli and feed these into the brain. Hence, the brain kept inside can experience these stimuli in the same way in which a normal human sensory system does. Doing this, the scientist can create an entirely fictitious world that feels completely normal to the brain held captive. This sounds eminently creepy to me!

But the idea of the Brain in a Vat (or the Brain in a Jar) theory is that no brain could ever know whether it is affixed inside a skull…

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