We don't know how the brain produces consciousness but we have a good idea from observing people suffering brain damage from accidents how a functional brain is

We don't know how the brain produces consciousness but we have a good idea from observing people suffering brain damage from accidents how a functional brain is directly linked to consciousness. Science can't prove the world is not the dream of a giant turtle- so technically I can't "know" anything- so asking "how can you know that?" Is kind of a boring line of questioning. It has no answer other than "Well I guess technically I can't know that, or anything," But that doesn't mean turtle dreams are going to get equal weight with our empirical models of the world.