I'm working on an article about bullet journaling for podcasters, specifically about handwriting vs. writing on a keyboard. I came across this James Pennebaker guy, and his research into the therapeutic value of writing. I'm linking to Wikipedia instead of a more credible resource because, as I write this, I have something like 40 tabs open on my computer right now, and this bit of info felt most important to share: 
"These results have hatched further studies, numbering over 200. One of these went on to strongly suggest that expressive writing has the potential to actually provide a 'boost' to the immune system, perhaps explaining the reduction in physician visits. This was shown by measuring lymphocyte response to the foreign mitogens phytohaemagglutinin (PHA) and concanavalin A (ConA) just prior to and 6 weeks after writing. The significantly increased lymphocyte response led to speculation that expressive writing enhances immunocompetence. The results of a preliminary study of 40 people diagnosed with Major Depressive Disorder suggests that routinely engaging in expressive writing may be effective in reducing symptoms of depression."

What I can't figure out from this is whether or not the study participants wrote using pen or pencil and paper, writing longhand, if they typed, or either.