Brain snatched
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Transcript of Brain snatched
Brain SnatchedThought experiment 1
Do we have any REASON to suppose that the earth and everything on it really exists?
Or could it all be an illusion!
A brain in a vat
Colin Spiggott about to relax and watch the film Invasion of the body snatchers
Aliens from another planet
A night of nightmares
Neptune
Removing the brain
Brain in a vat
Connected to the super computer
It’s not real, it’s all an illusion
Carrot to goldfish
Immersed in a computer program
Wake up…it’s a nightmare
Hideous Neptunian alien
‘This is you Colin’
How do you know that you are not a brain in a vat?
2 Hypothesis
1. What you see around you is all virtual – An illusion. You are really a disembodied brain floating in water connected to a sophisticated super computer that generates perfect experiences as we know them
What you see around you is real
What justifies that belief?
In order to know something you need grounds for believing it. You must be justified in believing what you do. So in order to know that what you see is real and not virtual, you must be able to justify that belief. But it seems you cannot justify it. So, astonishingly, it seems you do not know that what you are now experiencing is real.
An astonishing conclusion
A sceptical conclusion
Sceptics claim that we do not know what we might think we know. The claim that we do not know anything about the world around us is called scepticism.
http://www.youtube.com/watch?v=ursdoT66JlU
Lisa the sceptic
Watch the episode from 6 minutes onwards