We don't know enough about the brain to state with certainty that certain people, or certain conditions make it impossible to gather and process some informatuion while supposedly unconscious under anaesthetic. Snippets of conversation and everyday knowledge could give enough information. 21 gramme experiment? Oh please! Try reading a book called "Weighing the Soul" by Len Fisher. The loss can be attributed to the body dehydrating after death (IIRC - it's a while since I read it), and dogs NOT losing was actually sloppy methodology... That's been thoroughly explained, ages ago.