The effects of immediate recall on eyewitness accuracy and susceptibility to misinformation

Eyewitnesses can be influenced by misinformation that they encounter when discussing the event with a co-witness. Some studies have found that an immediate recall of the event can inoculate eyewitnesses against such misinformation; others have found that it increases susceptibility to misinformation. These different findings may be due to methodological factors, so the aim of this study was to investigate the effects of three different recall conditions. An immediate cued recall, free recall or no recall was given to 88 participants after they watched a crime video. They then discussed the video with a confederate who introduced correct and incorrect information about the video. Accuracy and amount of recall was tested one week later. It was found that the immediate-recall questionnaire did not make participants more susceptible to misinformation in comparison to no-recall participants, indeed the data trended the other way, suggesting that immediate-recall inoculated participants against misinformation. Furthermore, the provision of correct post-event information increased memory accuracy, especially after immediate recall.     

How to induce resistance to the misinformation effect? Characteristics of positive feedback in the reinforced self-affirmation procedure

ABSTRACT

The memory misinformation effect consists in the inclusion in witness testimonies of information from sources other than the given event. In the present article, research which aims to make people resistant to misinformation is presented. It is based on reinforced self-affirmation (RSA), a method designed to enhance participants’ self-confidence and therefore make them more willing to rely on their own memories instead of external sources. RSA includes self-affirmation and positive feedback. In the present research, the efficacy of various kinds of positive feedback was explored. The results of Experiment 1 suggested that positive feedback relating to memory (MemRSA) is effective in reducing the misinformation effect, while positive feedback relating to general cognitive ability is not. In Experiment 2, the superiority of MemRSA over inefficient feedback relating to attention was demonstrated. In Experiment 3, MemRSA was again effective, and more effective than inducing convictions about the independence of judgements, but this also reduced the misinformation effect. The results are discussed from the perspective of witnesses who remember the correct information yet rely on external sources due to a lack of confidence in t aforementioned heir memories.     

The cognitive interview and its effect on misleading postevent information

Abstract

The present study investigated the effectiveness of the cognitive interview on reducing the impact of the misinformation effect. A 2×2 between-groups design was used, with interview type (cognitive or structured) and narrative type (misleading or neutral) as the independent variables. Adults (n=40) viewed video footage depicting a bank robbery and then received either a misleading or neutral postevent narrative. Participants were interviewed with either a cognitive or a structured interview regarding their memory for the original footage. The cognitive interview produced significantly more correct pieces of information than the structured interview, without an increase in errors or confabulations. An anomalous significant interaction was found regarding the number of incorrect pieces of information, where recipients of the structured interview made more recall errors when receiving neutral postevent information compared to neutral postevent information. A misinformation effect was successfully achieved but the enhancing effects of the cognitive interview were unable to reduce it. Results are discussed within the misinformation effect theoretical framework. The limitations of the present study are also discussed.     

The saliency of gestural misinformation in the perception of a violent crime

Recent research has revealed that misinformation from gestures can influence eyewitness memory. However, it is still unclear whether gestural misinformation can emulate the effects of verbal misinformation on the reporting of major details in serious crimes. To investigate the salience of suggestions provided nonverbally, and how these compare to those made verbally, two experiments were conducted. In Experiment 1, participants watched footage of a crime scene and were presented with one of two types of gestures during questioning that suggested different interpretations of the crime. The results confirmed that the gestures influenced responses, with participants altering their interpretation of the crime according to the information gestured to them. Experiment 2 built on this to investigate how comparable gestural influence was to verbal influence. The results revealed that gestural misinformation caused participants to alter their interpretation of the crime and elicited the same effects as verbal misinformation. Across the two experiments, participants were unlikely to identify the misleading gestures or report feeling misled by them. These results reveal new insights into the strength of gestural misinformation and show that, despite their subtle nature in communication, gestures can exert a powerful influence in eyewitness interviews.     

The indirectly generated tainted truth effect: warning is not necessary to worsen the testimony of non-misled persons

The purpose of the present research was to examine the indirectly generated tainted truth effect (TTE). The TTE refers to decreased accuracy on a memory test among persons who are erroneously warned about non-existent misinformation in material that describes an event. It was expected that the TTE would occur even without an explicit warning about misinformation, if one distinctive item of misinformation appeared in postevent material that also contained correct information that was consistent with the original material about the event (indirectly generated TTE: IGTTE). Experiment 1 produced the IGTTE and this effect was replicated in Experiment 2. Experiment 2 showed that the classic and indirect versions of the TTE usually occurred among persons who incorrectly monitored the source of information. Experiment 3 replicated the IGTTE using a procedure that included an additional phase between presenting the original and postevent material – initial testing. When the initial testing procedure was administered in Experiment 3, the TTE was smaller; however, this initial testing procedure had no effect on the IGTTE.     

Immunohistochemical staining as a potential method for the identification of vaginal epithelial cells in forensic casework

There is currently no accurate method to identify vaginal epithelial cells uniquely. This study aimed to use a cell extraction procedure compatible with routine forensic sampling methods, and to investigate the expression of cytokeratin (CK), estrogen receptor-alpha (ERalpha), and phosphodiesterase 5 (PDE5) in order to distinguish between skin, buccal, vaginal, and external penile epithelial cells. Seminal fluid samples were also examined. Epithelial cell samples were fixed in formalin, embedded in agarose, and processed using histological methods. Antigen-antibody reactions were detected using the DAKO Envision+ detection system. CK was present in all cells from all five sources confirming the origin of cells as epithelial. Both ERalpha and PDE5 positively labeled vaginal, buccal, and skin epithelial cells. Although an antigen unique to vaginal epithelial cells was not identified, we have described a cell extraction procedure for use in the immunohistochemical detection of a wide range of antigens, an approach compatible with forensic diagnostics.     

The use of isoelectric focusing (IEF) as a method for the combined phenotyping of erythrocyte acid phosphatase (EAP) and esterase D (EsD)

The simultaneous isoelectric focusing (IEF) in polyacrylamide gels (PAG) of erythrocyte acid phosphatase (EAP) and esterase D (EsD) allows the poor discriminating power (DP) of EsD to be usefully combined with a highly discriminating system EAP, such that a joint DP of 0.766 was achieved compared with PGM IEF DP 0.756. Focusing was carried out in a centrally flattened gradient containing ampholines (pH 4-6 and 6-8) and the chemical spacer 3-(N-morpholino) propanesulphinic acid (MOPS). It enabled the identification of six EsD phenotypes including the recently discovered EsD5 isozymes. The application of this method to casework bloodstains is discussed.