(noun) the occurrence of one mumbling an entire conversation to oneself, possibly even answering their own questions, because they are desperate for conversation or they are absent-midedly thinking aloud. Despite popular belief, it is not a sign of psychosis or schizophrenia. Usually.
Winnie continued her selfsation: "Where did I leave my necklace?....Right there on the table. Why was it on the table? Because you put it there, silly. I wonder if Johnny will be back with coffee soon? Give him some time, he only left a couple of minutes ago, jeez..."