Insects and Other Animals Have Consciousness, Experts Declare | Quanta Magazine
(www.quantamagazine.org)
I recently read an informative post about insects that suggested limited awareness. A grasshopper was eaten by a praying mantis. The comment suggested that the half that was still alive might not feel pain the way that we do as it continued to operate. I think this is what's being disputed to some degree (not the pain part, but that we're so different). I might be wrong. I'm not a biologist.