On 2007-03-04, Tris wrote:
“When I take Ketamine, I perceive myself to have less free will than when I don’t” is no evidence at all that you have free will in the first place.
It’s a subtle way of begging the question, I think.
Some people might have hallucinations about being able to fly, which they take drugs to suppress. The fact that they perceive less ability to fly when on drugs doesn’t imply they had the ability before they took the drugs.
It’s easier for us to determine if someone can fly than if they have free will, but changing their peception of whether they can/have or not doesn’t help us in either case.