The effect of odour reinstatement on children's episodic memory

Children's memory reports are often sparse, which increases the need for efficient interview methods. The present study investigated whether odour reinstatement can aid children's memory and increase the amount of information recalled from an experienced event. Children (N = 106, mean age 10 years, 8 months) experienced a magic show where a vanilla odour was present and were interviewed about their memory of the event either one week, or six months, after the magic show. During the interview, half of the children re-experienced the same vanilla odour. In contrast to studies on adult participants, no odour-reinstatement effect was found with the child participants in the present study. On the other hand, odour reinstatement reduced the children's ratings of how strong their emotions were during the event. Thus, odour reinstatement may affect different forensically relevant factors, and this should be considered in future research.     

Remembering remotely: would video-mediation impair witnesses' memory reports?

Witnesses often experience lengthy delays prior to being interviewed, during which their memories inevitably decay. Video-communication technology – favored by intergovernmental organizations for playing larger roles in judicial processes – might circumvent some of the resourcing problems that can exacerbate such delays. However, whereas video-mediation might facilitate expeditious interviewing, it might also harm rapport-building, make witnesses uncomfortable, and thereby undermine the quality and detail of their reports. Participants viewed a crime film and were interviewed either one day later via video-link, one day later face-to-face, or 1–2 weeks later face-to-face. Video-mediation neither influenced the detail or the accuracy of participants' reports, nor their ratings of the quality of the interviews. However, participants who underwent video-mediated interviews after a short delay gave more accurate, detailed reports than participants who waited longer to be interviewed face-to-face. This study provides initial empirical evidence that video-mediated communication (VMC) could facilitate the expeditious conduct of high-quality investigative interviews.     

Eye-closure improves memory for a witnessed event under naturalistic conditions

Eye-closure may help people remember live and videotaped mundane events and videotaped violent events. The present study extended this research by examining memory for a forensically relevant live event (a staged verbal altercation) and by interviewing witnesses under naturalistic conditions. Ninety-six witnesses were interviewed either inside in a quiet setting or outside on a busy street, with eyes open or closed. In free recall, eye-closure significantly increased the number of correct details reported, without harming testimonial accuracy. These benefits were significant for witnesses interviewed inside but not for witnesses interviewed outside. This finding highlights the potential role of spontaneous mental context reinstatement in the eye-closure effect. In cued recall, eye-closure improved fine-grain correct recall of visual details for both groups of witnesses. From an applied perspective, the findings suggest that police interviewers should instruct witnesses to close their eyes, both during initial statements taken on the street and during full interviews conducted at the police station.     

The devil is in the detail: deception and consistency over repeated interviews

ABSTRACT

Research indicates that truthful statements typically contain more details than fabricated statements, and that truth tellers are no more consistent than liars over multiple interviews. In this experiment, we examine the impact of (i) multiple interviewers and (ii) reverse order recall on liars’ and truth tellers’ consistency and amount of reported detail over repeated recall attempts. Participants either took part in a mock crime (lying condition) or an innocent event (truth telling condition) which they were subsequently interviewed about in two separate interview phases. Truth tellers provided more details overall, and more reminiscent details than liars. There were no differences between veracity groups for the number of omissions made or repetitions reported. Despite the popular belief that inconsistency is a cue to deception, we found little support for the notion that consistency (or lack of consistency) offers a diagnostic cue to deception. We found little evidence that switching interviewer or recalling in reverse order induced inconsistencies in liars. In fact, due to the number of reminiscent details in truth tellers’ accounts, our findings suggest that accounts provided by liars tend to be slightly more consistent than those provided by truth tellers. Materials for this paper can be found at osf.io/hgvmk/.     

A re‐analysis that supports our main results: A reply to Levine et al.

Levine et al. (2018) criticized our meta‐analysis, but their conclusion was the same as ours: The cognitive approach to lie detection results in a modest improvement. We address and dismiss Levine et al.'s (2018) three criticisms. Regarding the ‘confound’, in our meta‐analysis we averaged the results of two cells on statistical grounds, which does not constitute a confound in statistical terms. Regarding ‘aberrant controls’, that depends entirely on the benchmarks selected and type of statistical test and meta‐analysis used. Regarding ‘unreliable data’, the claim that there is a positive relationship between ‘unreliable’ data and total accuracy in the cognitive lie detection conditions is not even supported by their own data (p = .16). We conclude with a request to Levine et al. to focus on our shared aim: to develop interview protocols that enable lie detection.     

Detecting children's false allegations and recantations of a crime

This study examined adults’ abilities to detect the veracity of children's (ages 6–11) initial disclosures and their later recantations about a crime. Children (N?=?32) were asked to make a false denial or a false accusation of an alleged theft, while some were asked to tell the truth. Afterwards, children recanted their initial statements in a second interview; thus, children who initially denied the theft accused a researcher of the transgression in the second interview, and vice-versa. Adult raters (ages 18–25; N?=?108) watched both interviews and completed a questionnaire that required them to determine the veracity (i.e. whether the report was true or false) and credibility of the disclosure. Adults accurately detected the veracity of children's reports 53% of the time (55% of original reports, 50% of recantations). Raters were more accurate when detecting false denials than false accusations in the children's original and recanted reports. Despite being more difficult to detect, children's recanted denials that became accusations were rated as the least credible. Furthermore, self-reported level of experience with children and ratings confidence were not significant predictors of truth/lie detection accuracy.