A Study on the Voice and Speech of Deception

The aim of this study is to investigate the voice and speech of deception. Participants were induced to tell a spontaneous lie of cheating. Participants were assigned to 3 groups: lie group(20 peoples), true group(5 peoples), and control group(15 peoples). All of participants were asked questions relevant to the cheating and questions irrelevant to the cheating. The measurement of voice and speech were mean of syllable number, mean of response latency period, mean of total pause period, mean of pause frequency, mean of pause rate, mean of total speech duration, mean of speech rate, mean of articulation rate and mean of speech error frequency. We conducted repeated measures ANOVA to investigate the effect of group and response content condition on the voice and speech character. Results showed that in the lie and the true group, total pause period of relevant condition was longer, pause frequency, pause rate and speech error frequency of relevant condition were higher than them of irrelevant condition. Speech rate of relevant condition was lower than them of irrelevant condition in lie group, but faster in true group. But in control group, there was no difference between relevant and irrelevant conditions. Results indicate that there are useful of a lie detector using voice variances in criminal investigation agency. However, similarities between the lie group and true group suggest that there are probably the effect of committing a crime on voice and speech variances as well as deception. Finally, the limitations of this study were discussed with suggestions for the future study.

keywords: deception, voice, speech behavior, deception, voice, speech behavior, 거짓말, 음성, 발화행동

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Article Contents

Vol.27 No.1

A Study on the Voice and Speech of Deception

Abstract

Reference

Korean Journal of Psychology: General