In the comments on this answer from another question, a discussion was started regarding the way native speakers use reflexive pronouns to sound "more intellectual" (for example: "I myself have found in this research...").
I know it isn't correct in standard English, but I wonder if it has a literary history. Where does this come from? Has it been around for long? (All of my preliminary research has shown mostly anecdotal results, and I'm looking for actual data if it's available.)
An alternate hypothesis posited that really it's the repetition ("I myself", "you yourself", etc.) that is desired to give the appearance of intellectualism, and the (improper) use of reflexive pronouns may merely be a means to achieve that goal. Is the use of repetition shown more frequently in "intellectual" speech than just through improper reflexive pronouns?
(As an aside, I'd love to see anecdotes in the comments about whether this varies dramatically by region or other demographic grouping. I'm in the US, so my experiences are narrow.)