Why materialists are predominantly materialists

[Angrboda]

Clearly false. No one experiences pain after they form a concept of pain. Pain is the experience itself - primal and unmediated.

Pain is information, it is what the brain tells us to feel given certain stimli. There are people who can't feel pain.
https://en.wikipedia.org/wiki/Congenital...ty_to_pain 
Interestingly they can still feel touch.

There's also pain asymbolia.

Pain asymbolia, also called pain dissociation, is a condition in which pain is experienced without unpleasantness. This usually results from injury to the brain, lobotomy, cingulotomy or morphine analgesia. Preexisting lesions of the insula may abolish the aversive quality of painful stimuli while preserving the location and intensity aspects. Typically, patients report that they have pain but are not bothered by it; they recognize the sensation of pain but are mostly or completely immune to suffering from it.

https://en.wikipedia.org/wiki/Pain_asymbolia

Once again we see that supposedly 'unmediated' aspects of consciousness are very much mediated by parts of the brain. Consciousness, experience, and feeling are composites. Just as frontal lobe damage patients can appreciate risk without being averse to it, and cerbral achromotopsia patients experience an internal world devoid of color, we note that consciousness is a piecemeal affair, and those pieces correspond strongly to specific parts of the brain.