Testosterone and cortisol in coalitional competition

The entire thesis text is included in the research.pdf file; the official abstract appears in the short.pdf file; a non-technical public abstract appears in the public.pdf file.Title from PDF of title page (University of Missouri--Columbia, viewed on October 2, 2009).Thesis advisor: Dr. David C. Geary.M.A. University of Missouri--Columbia 2008.Fourteen teams of three young men competed in within-group and between-group videogame tournaments. Salivary cortisol and testosterone levels were assessed twice before and twice after each tournament, along with intelligence, anxiety, mood, personality and social variables. Men high on self-reported social leadership traits and who ranked first or second across both teams showed increased testosterone following the between-group competition and increased cortisol following the within-group competition. Low ranking men on winning teams did not show an increase in testosterone, but high ranking men on losing teams did. Although a between-group team effect did not emerge for testosterone, there were consistent differences in hormone response comparing the between- and within-group matches; testosterone was related to performance in the between-group match and cortisol in the within-group match. Implications are discussed in terms of men's competitive responses when competing against teammates compared to when competing against an unfamiliar team.Includes bibliographical references

Individual differences affect hormonal responses to a team-based violent videogame competition, but not in solitary play

Title from PDF of title page (University of Missouri--Columbia, viewed on March 7, 2011).The entire thesis text is included in the research.pdf file; the official abstract appears in the short.pdf file; a non-technical public abstract appears in the public.pdf file.Dissertation advisor: David C. GearyVita.Ph. D. University of Missouri--Columbia 2010.[ACCESS RESTRICTED TO THE UNIVERSITY OF MISSOURI AT REQUEST OF AUTHOR.] Testosterone and cortisol were assessed along with various personality measures in response to a violent videogame competition in three different conditions. Hormonal responses varied with individual differences in social phobia, extroversion/introversion, and in-group orientation. Moreover, the stimuli to which cortisol responded differed between social and nonsocial contexts. Otherwise, testosterone responses appeared to require an audience, without which status appears to be irrelevant.Includes bibliographical references