Consistent use of the word "I" reveals negative emotionality.
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Allison M. Tackman, David A. Sbarra, Angela L. Carey, M. Brent Donnellan, Andrea B. Horn, Nicholas S. Holtzman, To'Meisha S. Edwards, James W. Pennebaker, Matthias R. Mehl. Depression, negative emotionality, and self-referential language: A multi-lab, multi-measure, and multi-language-task research synthesis.. Journal of Personality and Social Psychology, 2018; DOI: 10.1037/pspp0000187