Apparitions. Can naturalism adequately account for purported ghost appearances?

Bryan Bonner has agreed to co-present for us. Bryan is a paranormal investigator who has worked with Matthew Baxter investigating claims of ghosts, psychics, UFOs, conspiracy theories, and urban legends. A Wikipedia article ("Bryan & Baxter") says they specialized in exposing frauds and became associated with scientific skepticism. He is a founding member of the Rocky Mountain Paranormal Research Society and with Robert Lewis has written three volumes of Case Files of the Rocky Mountain Paranormal Research Society. We couldn't ask for a more qualified presenter for our discussion.