If I sit in a room at night with the blinds pulled and the lights turned off, I can't see anything. According to theorist's definition of mental activity in the visual cortex (assuming that is the definition he's using now, because it changes every post or two), then it is "dark".
But, if I close my eyes and then push gently on my eyelids with my fingers, I see all kinds of flashes and patterns. This must mean that my visual cortex now has neural activity.
By theorist-constant's definition, I can make it go from "dark" to "light" by pushing on my eyelids.
That is, "light" and "dark" actually have nothing to do with electromagnetic radiation under this definition. They are states that only depend on the human brain.
Is that correct?