[jhedwards]

Well, you can give someone anesthesia, which turns most of the neurons in the brain off, and then you lose consciousness. The fact that we can target the brain specifically to turn consciousness on and off seems to suggest that it's a physical property of brain function, not just a philosophical issue.

[somenameforme]

You're begging the question, because you're assuming that not only do I have a consciousness but that it's turned on and off by the brain. If I don't happen to have a consciousness then clearly anesthesia is not going to regulate it in any fashion.

[thornewolf]

this relies on the fact that consciousness is an overloaded term. being conscious (awake) refers to something different than being conscious (thinking) which may both be unrelated to the brain being on or off, which again may be unrelated to the capability to have experiences.

all of these use the same word, they each may or may not be the same thing.