I talk to myself all the time. I don't do it systemically--it's more spontaneous. Years ago I only spoke to myself when i was mad, usually for missing a shot on the tennis court. Now, it's more often than not an expression of joy and not necessarily directed at me as opposed to with me over something I am experiencing in the moment, whether from internal or external stimuli, after all, I am usually not in the presence of other humans. I also talk to souls a lot :-)