Do Credibility Statements Really Matter? Applying Truth-Default Theory to Public Speaking

James A. Dubuisson University of Alabama ; Darrin J. Griffin University of Alabama

Abstract

This study explores how truth-default theory (TDT) and relevance theory apply to public speaking and business communication. Two hundred eight college students watched one of four speech introductions varying by topic relevance and the presence of an explicit credibility statement. Participants rated speaker trustworthiness and credibility. Results showed that topic relevance had a greater influence on audience perceptions than explicit credibility statements. Highly relevant topics reduced suspicion and supported TDT’s claim that deception detection requires a trigger. These findings illustrate how speakers can build credibility and how audiences evaluate messages in educational and business public speaking contexts.

Journal
Business and Professional Communication Quarterly
Published
2026-03-21
DOI
10.1177/23294906261423491
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  1. Business and Professional Communication Quarterly
Also cites 25 works outside this index ↓
  1. Burgoon J. K. (1993). Interpersonal expectations expectancy violations and emotional communication. Journal o…
  2. Calabrese R. (1989). Designing and delivering presentations and workshops. The Bulletin of the Association fo…
  3. Clementson D. E. Page T. G. (2021). (In)sincere demeanor and (in)sincere language in crisis communication. Jo…
  4. Delia J. G. (1976). A constructivist analysis of the concept of credibility. Quarterly Journal of Speech 62(4…
  5. DePaulo B. M. Lindsay J. J. Malone B. E. Muhlenbruck L. Charlton K. Cooper H. (2003). Cues to deception. Psyc…
  6. Ekman P. Friesen W. V. (1967). Head and body cues in the judgment of emotion: A reformulation. Perceptual and…
  7. Ekman P. O’Sullivan M. Friesen W. V. Scherer K. R. (1991). Invited article: Face voice and body in detecting …
  8. Fan X. Griffin D. J. Tagg E. P. (2022). Lie judgment trigger sensitivity and truth-bias: Truth default theory…
  9. 10.5539/ijps.v6n1p19
  10. 10.4324/9781003016519
  11. Levine T. R. (2014). Truth-default theory (TDT). Journal of Language and Social Psychology 33(4) 378–392. htt…
  12. Levine T. R. (2022). Truth-default theory and the psychology of lying and deception detection. Current Opinio…
  13. Levine T. R. Blair J. P. Clare D. D. (2013). Diagnostic utility: Experimental demonstrations and replications…
  14. Levine T. R. Daiku Y. (2018). How customs agents really detect lies. Communication Research Reports 36(1) 84–…
  15. Mann S. Ewens S. Shaw D. Vrij A. Leal S. Hillman J. (2013). Lying eyes: Why liars seek deliberate eye contact…
  16. McCroskey J. C. Teven J. J. (1999). Goodwill: A reexamination of the construct and its measurement. Communica…
  17. McCroskey J. C. Young T. J. (1981). Ethos and credibility: The construct and its measurement after three deca…
  18. Park H. S. Levine T. McCornack S. Morrison K. Ferrara M. (2002). How people really detect lies. Communication…
  19. Aristotle’s metaphysics
  20. Sánchez N. Masip J. Herrero C. (2021). How people [try to] detect lies in everyday life. Trames: Journal of t…
  21. Sattler W. M. (1947). Conceptions of ethos in ancient rhetoric. Speech Monographs 14(1–2) 55–65. https://doi.…
  22. Self C. C. Roberts C. (2019). Credibility. In Stacks D. W. Salwen M. B. Eichhorn K. C. (Eds.) An integrated a…
  23. The Global Deception Research Team. (2006). A world of lies. Journal of Cross-Cultural Psychology 37(1) 60–74…
  24. Wheeless L. R. (1973). Effects of explicit credibility statements by more credible and less credible sources.…
  25. 10.1002/9780470756959.ch27