The effects of training professional groups and lay persons to use criteria-based content analysis to detect deception

Behavioral genetics of deception detection performance

Purpose

Deception detection is instrumental in business management but professionals differ widely in terms of deception detection performance. The purpose of this paper is to examine the genetic basis of deception detection performance using the classic twin study design and address the research question: how much variance in individual differences in deception detection performance can be accounted for by the variance in genetics vs environmental influences?

Design/methodology/approach

In total, 192 twins, with 65 pairs of monozygotic (identical) twins and 31 pairs of dizygotic (fraternal) twins participated in an experiment. A series of behavioral genetic analyses were performed.

Findings

The variability in deception detection performance was largely determined by differences in shared and non-shared environments.

Research limitations/implications

The subjects were solicited during the Twins Days Festival so the sample selection and data collection were limited to the natural settings in the field. In addition, the risks and rewards associated with deception detection performance in the study are pale in comparison with those in practice.

Practical implications

Deception detection performance may be improved through training programs. Corporations should continue funding training programs for deception detection.

Originality/value

This is the first empirical study that examines the complementary influences of genetics and environment on people’s ability to detect deception.

(The null) Importance of police experience on intuitive credibility of people with intellectual disabilities

In the present study, the intuitive ability of police to discriminate between real and false statements of people with mild and moderate (IQ range=50-80, average=60.0) intellectual disabilities (ID) was analyzed. The assessments issued by groups with different levels of experience in police techniques (psychology students, and police officers) were compared. The results showed no differences between the two groups in their ability to discriminate (d'=0.785 and d'=0.644, respectively). When the experience of the police was taken into consideration, no differences were found between "experienced" and "novice" police officers (d'=0.721 and d'=0.582, respectively). No differences were found in response criteria, which were neutral in all cases. Moreover, 34.73% of cases evaluated by the inexperienced group were incorrectly discriminated, in comparison to the 37.75% of incorrect assessments made by police. The implications of the limited ability of intuition to discriminate between real and simulated victims with ID, which did not yield significant differences between experienced and inexperienced assessors in obtaining and assessing statements, are discussed. In light of the results of this study, it is concluded that adequate resources and standardized procedures to properly address people with ID who come into contact with the police and judicial institutions need to be provided.