I disagree with those who think phenomenal externalism can be refuted very easily on the basis of controversial intuitions about brains in vats (Horgan, Tienson and Graham), inverted spectrum (Shoemaker), actual cases of perceptual variation (Block), and so on. Both sides of the debate have missed the best argument against phenomenal externalism. The real trouble with phenomenal externalism is that it goes against decades of research in psychophysics and neuroscience. This research supports a brain-based theory of phenomenal consciousness.