How does Forster trace the human interest in the story to primitive times?

Forster thought story-telling went back to the Neolithic or maybe even Paleolithic Age. He says one can judge from the skull of the Neanderthal that it listened to stories. He believes that it was just an idle time for the early humans who were tired after hunting. Only the suspense of a story held them after which they were so disinterested that they may have even killed the man.