Sounds like just another "just-so story" to me. Blame the primitives. They were ignoramuses. We know better than they did, today. Because we know something they didn't know: That mental phenomena are merely epiphenomena of processes in the physical brain. And as such, can have no value or meaning. Sheesh....
What better way to dismiss the supernatural than to write it off as *hallucinations*?
It sure makes it easier than really trying to address the reality the scientific method is singularly ill equipped to deal with.
Wow. Way to wave away something you apparently find inconvenient to consider. There's no element of blame in Jaynes's explanation, or any attempt to label them as primitive. He's talking about people as recent as the ancient Greeks, the ones who fought the Trojan War. He also doesn't claim that communications from the right side of the brain are valueless. Sheesh, learn about something before you dismiss it, why don't you?