Our intestinal biomes regulate a lot of our appetites and moods, and are not our moods and wants considered thoughts? I think you can create an engram of a person's thoughts in any given moment, but like: A.) the brain is not the whole of where those thoughts are coming from, and 2.) the amount of electrical discharge it would take to ping and record such an engram would literally destroy a lot of the delicate pieces of bioelectric hardware that is the human brain There's no way for it to not? You'd literally have to do it at the moment of death or it would be some weird form of murder/suicide.