How do emotions influence the language structures we use? What are the verbal signs of subjectivity?

I am doing research about the linguistic content of media (debates, talk-show, sport comments). It occurs that once the participant gets nervous or excited, the grammatical structure of the sentences and word choice (growing amount of modal verbs, judgmental adjectives, not politically correct nouns, dynamic verbs) can change.

That is why I am looking for sources that give me some research results about how emotions affect our verbal expressions (e.g., sentence structure, word usage, etc). 

My research is in Polish and Dutch.
This is by no means exhaustive, but is a beginning, as these links also provide links.

Journal of Cognitive Neuroscience
A Neural Dissociation within Language: Evidence that the Mental Dictionary Is Part of Declarative Memory, and that Grammatical Rules Are Processed by the Procedural System  

The following study links the effects of emotional arousal on these two memory systems, thus linking the effects of emotional arousal on speech.

Effects of emotional arousal on multiple memory systems: Evidence from declarative and procedural learning
Stephan Steidl, Salwa Mohi-uddin, and Adam K. Anderson

How Emotion Shapes Behavior: Feedback, Anticipation, and Reflection, Rather Than Direct Causation
Roy F. Baumeister  Kathleen D. Vohs  C. Nathan DeWall  Liqing Zhang

A review of paradoxical performance effects: Choking under pressure in sports and mental tests
Roy F Baumeister  Carolin J. Showers

Choking under pressure refers to the failure of a person to perform tasks that they are highly skilled in, when placed under pressure to perform. This could well apply to people speaking on a talk show.

This study shows the effects of various emotions on the actual voice quality, which is also useful.

THE EFFECTS OF EMOTIONS ON VOICE QUALITY
Tom Johnstone and Klaus R. Scherer
University of Geneva