Q. I am doing an research paper on how writing can be used to improve a persons mental or physical state.

I would begin the search using the PsychArticles and PsychInfo databases.  You can find links to these at the following page:  http://libguides.unomaha.edu/content.php?pid=112019&sid=843501

If you can not find the information you need here, then I'd suggest you contact Melissa Cast-Brede (education and psychology librarian) at 402 554-3130.