What does it imply about personality and psychology when someone routinely refers to themselves in the third person.

ETpro remember’s Dick Nixon doing it and occasionally Bob Dole. ETpro guesses everyone does refer to themselves in the third person occasionally for emphasis, or humor. But to routinely use your own full name in referring to yourself strikes me as odd. Here’s the recent instance that got me wondering about its implications. What does illeism say about the speaker’s personality and psychological makeup?