Do you refer to language reading or comprehension?

Thanks for your interest. I am referring to language production, such as certain words that are used consistently more by anxious or stressed people. 

Check these out:

Recurrent involuntary imagery in people who stutter and people who do not stutter.Tudor H, Davis S, Brewin CR, Howell P. J Fluency Disord. 2013 Sep;38(3):247-59.

Parent perceptions of the impact of stuttering on their preschoolers and themselves.Langevin M, Packman A, Onslow M. J Commun Disord. 2010 Sep-Oct;43(5):407-23.

Aphasiology. 2014 Jan 1;28(2):133-154.

Psycholinguistics of Aphasia Pharmacotherapy: Asking the Right Questions.

Cahana-Amitay D, Albert ML, Oveis A.

Aphasiology. 2011;25(2):593-614. Language as a Stressor in Aphasia.

Cahana-Amitay D, Albert ML, Pyun SB, Westwood A, Jenkins T, Wolford S, Finley M.

A cross-cultural investigation of inhibitory control, generative fluency, and anxiety symptoms in Romanian and Russian preschoolers.Cheie L, Veraksa A, Zinchenko Y, Gorovaya A, Visu-Petra L.Child Neuropsychol. 2014

Do you mean language production as automatic or the formation of certain words to be experssive of - or both

@ Dr J-F: I mean, do you know any studies where they identified something in a text or in spoken language which is correlated to anxiety or stress?

Is your focus rather clinical or on language production itself? James W. Pennebaker might be an author of interest...

@Torsten Ehrlich: Pennebaker produced a lot of interesting content about depression, unfortunately not much on stress or anxiety...

Ok, that's right. How about this one:

Clare, T. S., Menzies, R., Onslow, M., Packman, A., Thompson, R., & Block, S. (2009). Unhelpful Thoughts And Beliefs Linked To Social Anxiety In Stuttering: Development Of A Measure. International Journal of Language & Communication Disorders, 44(3), 338-351.

or this one:

Hofmann, S. G., Moore, P. M., Gutner, C., & Weeks, J. W. (2012). Linguistic correlates of social anxiety disorder. Cognition & emotion, 26(4), 720-726.

Thanks, that helped me out a great deal!

Always a pleasure. :-)

In my work with aphasics and chemobrain,stress is shown in repeating longer phrases and more so in phrasing comprised of less familiar words (refer to sentence repetition subtest of the Boston Diagnostic Aphasia examination).  Stress is also found in putting a speaker on the spot (like stage fright)...asking them for content that they are not well versed in resulting in word finding problems. Stutters find saying a persons'name is most difficult. Dysnomics have most dificulty with lessfamiliar content words.  Chemo brain subjects have increased stress and difficulty recalling and formulating when pain, anxiety, sleep and fatigue are higher.

Pretty basic stuff but I hope this was of some use to you

MikeC-SLP