Using sketch drawing to induce inconsistency in liars
Version of Record online: 18 MAR 2011
© 2010 The British Psychological Society
Legal and Criminological Psychology
Volume 16, Issue 2, pages 253–265, September 2011
How to Cite
Leins, D., Fisher, R. P., Vrij, A., Leal, S. and Mann, S. (2011), Using sketch drawing to induce inconsistency in liars. Legal and Criminological Psychology, 16: 253–265. doi: 10.1348/135532510X501775
- Issue online: 5 AUG 2011
- Version of Record online: 18 MAR 2011
- Received 8 September 2009; revised version received 26 February 2010
Purpose. Consistency as a cue to detecting deception was tested in two experiments using sketch drawing and verbal reports in repeated interviews. Liars were expected to be less consistent than truth-tellers.
Methods. In Expt 1, 80 undergraduate students reported truthfully or deceptively about an alleged lunch date – they sketched the layout of the restaurant and then answered spatial questions about objects in the restaurant. Ratings were given for the consistency between sketches and verbal reports. In Expt 2, 34 undergraduate students reported truthfully or deceptively about completing a series of unrelated tasks – they answered spatial questions about objects in a room and then sketched the layout of the room. Proportions were calculated for the consistency between verbal reports and sketches.
Results. Expt 1. Liars were rated as less consistent than truth-tellers. Up to 80% of truth-tellers and 70% of liars could be correctly classified. Expt 2. Liars were less consistent than truth-tellers on consistency proportions. Up to 100% of truth-tellers and 77% of liars could be correctly classified.
Conclusions. Using sketches to induce inconsistency may be a reliable, resource efficient way to help investigators detect deception.