Target-absent Lineups Research Articles

Oxytocin increases bias, but not accuracy, in face recognition line-ups

Previous work indicates that intranasal inhalation of oxytocin improves face recognition skills, raising the possibility that it may be used in security settings. However, it is unclear whether oxytocin directly acts upon the core face-processing system itself or indirectly improves face recognition via affective or social salience mechanisms. In a double-blind procedure, 60 participants received either an oxytocin or placebo nasal spray before completing the One-in-Ten task-a standardized test of unfamiliar face recognition containing target-present and target-absent line-ups. Participants in the oxytocin condition outperformed those in the placebo condition on target-present trials, yet were more likely to make false-positive errors on target-absent trials. Signal detection analyses indicated that oxytocin induced a more liberal response bias, rather than increasing accuracy per se. These findings support a social salience account of the effects of oxytocin on face recognition and indicate that oxytocin may impede face recognition in certain scenarios.

Line-up Member Similarity Influences the Effectiveness of a Salient Rejection Option for Eyewitnesses

Visually salient line-up rejection options have not been systematically studied with adult eyewitnesses. We explored the impact of using a non-verbal, salient rejection option on adults' identification accuracy for line-ups containing low- or high-similarity fillers. The non-verbal, salient rejection option had minimal impact on accuracy in low-similarity line-ups, but in high-similarity line-ups its inclusion increased correct rejections for target-absent line-ups as well as incorrect rejections in target-present line-ups, relative to a verbal rejection condition. The improved performance in target-absent line-ups suggests that adults, like children, may experience pressure to choose and guess during difficult tasks. This pressure is reduced when a prominent non-verbal rejection option is displayed in the line-up. However, the salient rejection option also appears to increase the attractiveness of avoiding a difficult choice between the target and highly similar fillers. Implications of these findings for the experimental literature and justice system are discussed.

Unfamiliar voice identification: Effect of post-event information on accuracy and voice ratings

This study addressed the effect of misleading post-event information (PEI) on voice ratings, identification accuracy, and confidence, as well as the link between verbal recall and accuracy. Participants listened to a dialogue between male and female targets, then read misleading information about voice pitch. Participants engaged in verbal recall, rated voices on a feature checklist, and made a lineup decision. Accuracy rates were low, especially on target-absent lineups. Confidence and accuracy were unrelated, but the number of facts recalled about the voice predicted later lineup accuracy. There was a main effect of misinformation on ratings of target voice pitch, but there was no effect on identification accuracy or confidence ratings. As voice lineup evidence from earwitnesses is used in courts, the findings have potential applied relevance.

Stress, Interviewer Support, and Children's Eyewitness Identification Accuracy

Few studies have investigated how stress affects eyewitness identification capabilities across development, and no studies have investigated whether retrieval context in conjunction with stress affects accuracy. In this study, one hundred fifty-nine 7- to 8- and 12- to 14-year-olds completed a high- or low-stress laboratory protocol during which they interacted with a confederate. Two weeks later, they attempted to identify the confederate in a photographic lineup. The lineup administrator behaved in either a supportive or a nonsupportive manner. Participants who experienced the high-stress event and were questioned by a supportive interviewer were most accurate in rejecting target-absent lineups. Results have implications for debates about effects of stress on eyewitness recall, how best to elicit accurate identifications in children, and developmental changes in episodic mnemonic processes.

Children's Identification Accuracy of Multiple Perpetrators: Examining the Simultaneous versus Elimination Line-up

Identification accuracy of child witnesses for a multiple perpetrator crime was examined using two line-up procedures, the simultaneous and elimination. Participants (N = 90) viewed a videotape of a staged theft involving two perpetrators (thief vs. accomplice). Each witness was shown two line-ups. Target-present and target-absent line-ups were used with each procedure across each perpetrator. Collapsing across line-up procedure, child witnesses correctly identified the thief and the accomplice at a comparable rate. When the thief was present in the line-up, the correct identification rate did not vary as a function of line-up procedure. However, when the accomplice was present in the line-up, the rate of correct identification was higher with the simultaneous procedure than with the elimination procedure. When the thief was absent from the line-up, the correct rejection rate was higher with the elimination procedure compared with the simultaneous procedure. Child witnesses correctly rejected the accomplice at a comparable rate across line-up procedures.

Target-Absent Eyewitness Identification Line-Ups: Why Do Children Like to Choose

Children generally fail to reject target-absent line-ups correctly as not containing the “perpetrator”. This experiment aimed to investigate this issue of higher rate of choosing behaviour in children by offering an alternative selection choice. One hundred and forty-eight children aged six to seven years actively participated in live craft events conducted by an adult male who later became the target to be identified. Supporting the hypotheses, the use of the alternative procedure was found to be significantly associated with the children's ability to reject the line-up correctly when the target was absent. Importantly, this was not accompanied by reduced performance in target-present conditions. Also supporting the hypothesis, children made correct decisions faster than incorrect decisions. The implications of these findings to applied forensic practice are discussed.

Earwitnesses: the effect of type of vocal differences on correct identification and confidence accuracy

Individual voice and speech characteristics are important for earwitness identification. A target-absent line-up with six foils was used to analyse the influence of voice and speech features on recognition. To create ecologically valid conditions for voice recognition, the present study used voices in conversation in the target event and for the foils. The participants were particularly successful in rejecting the two voice foils that were most dissimilar to the target voice in articulation rate and pitch. These two foils were also given somewhat higher confidence judgments than the other foils, although the level of that confidence was still somewhat low. In fact, participants as a collective were underconfident for these two foils but were overconfident for the other foils. In addition, they showed somewhat better ability in their confidence judgments to distinguish correct and incorrect responses for the two most dissimilar foils than for the four foils for which their identification responses were less successful. For the other four foils, which were more similar to the target voice, the participants showed in their confidence judgments very poor ability to distinguish between correct and incorrect identifications. Later positions in the parade were more often (erroneously) identified as the culprit, regardless of the specific foils used in those positions.

Replicating distinctive facial features in lineups: identification performance in young versus older adults

Criminal suspects with distinctive facial features, such as tattoos or bruising, may stand out in a police lineup. To prevent suspects from being unfairly identified on the basis of their distinctive feature, the police often manipulate lineup images to ensure that all of the members appear similar. Recent research shows that replicating a distinctive feature across lineup members enhances eyewitness identification performance, relative to removing that feature on the target. In line with this finding, the present study demonstrated that with young adults (n = 60; mean age = 20), replication resulted in more target identifications than did removal in target-present lineups and that replication did not impair performance, relative to removal, in target-absent lineups. Older adults (n = 90; mean age = 74) performed significantly worse than young adults, identifying fewer targets and more foils; moreover, older adults showed a minimal benefit from replication over removal. This pattern is consistent with the associative deficit hypothesis of aging, such that older adults form weaker links between faces and their distinctive features. Although replication did not produce much benefit over removal for older adults, it was not detrimental to their performance. Therefore, the results suggest that replication may not be as beneficial to older adults as it is to young adults and demonstrate a new practical implication of age-related associative deficits in memory.

Own-age bias in video lineups: a comparison between children and adults

The present study investigated whether child (six–eight years of age) and adult witnesses (18–29 years of age) would exhibit an own-age bias when trying to identify targets from video lineups. One hundred and eighty-six participants viewed two filmed events that were identical, except one starred a child target and one a young adult. After a delay of two–three days each witness saw a lineup for the child and adult target. Children exhibited an own-age bias and were better at correctly identifying the own-age target from a target-present (TP) lineup and made more correct rejections for the own-age target-absent (TA) lineup. Adults however, showed a reversed own-age bias for the TP lineups as they made more correct identifications for the child target, but exhibited no bias for the TA lineups. The results suggest that differences in identification accuracy may be due to whether witness age and suspect age overlap.

The “other-accent” effect in voice recognition

The current paper examines an “other-accent” effect when recognising voices. English and Scottish listeners were tested with English and Scottish voices using a sequential lineup method. The results suggested greater accuracy for own-accent voices than for other-accent voices under both target-present and target-absent conditions. Moreover, self-rated confidence in response to target-absent lineups suggested greater confidence for own-accent voices than other-accent voices. As predicted, the other-accent effect noted here emerged more strongly for English listeners than for Scottish listeners, and these results are discussed within an expertise framework alongside both other-race effects in face recognition, and other-accent effects in word recognition. Given these results, caution is advised in the treatment of earwitness evidence when recognising a voice of another accent.

Blind lineup administration as a prophylactic against the postidentification feedback effect.

Confidence and other testimony-relevant judgments may be distorted when witnesses are given confirming postidentification feedback, and double-blind procedures-wherein the lineup administrator does not know the identity of the suspect-are a commonly proposed, but untested, remedy for this effect. In the current study, mock witnesses viewed a staged crime video followed by a target-present or target-absent lineup where the administrator was or was not presumed to know the identity of the suspect. After making an identification decision, witnesses were or were not given realistic, but nonidentification-specific, feedback, and then confidence and other judgments were assessed. A significant interaction was found between blind condition and feedback such that feedback inflated confidence and other judgments in presumed nonblind conditions only; feedback had no effect on participants in presumed blind conditions. As predicted by the selective cue integration framework-a theoretical model suggested to explain the interaction between presumed blind administration and feedback-this interaction was significant only for inaccurate participants. These results suggest that blind administration may serve as a prophylactic against the negative effects of postidentification feedback. In addition, the effectiveness of our subtle feedback in influencing judgments suggests that lineup administrators should take care not to provide any feedback to eyewitnesses.

Effects of presentation format and instructions on the ability of people with intellectual disability to identify faces

The aim of this work was to analyze the effect of presentation format and instructions on the ability of people with intellectual disability to identify individuals they did not know and had seen only briefly. With this objective in mind, 2 groups of subjects with mild to moderate intellectual disability were shown a photograph of a person and, after a distracting task, were asked to identify that person in 2 line-ups (target-absent and target-present) with 6 photographs each, where 2 types of instructions (neutral vs specific, between-subject design) and 2 presentation formats (simultaneous vs sequential, within-subject design) for the line-up photographs were used. Each subject completed 4 trials. The results showed that, generally speaking, people with intellectual disability were capable of distinguishing the face of a person previously seen under all these conditions. There was a significantly higher incidence of false alarms, however, when the photographs were presented sequentially and when specific instructions were not given. With specific instructions designed to lessen the social desirability effect and increase motivation for the task, false alarms on the target-absent line-up were reduced. The results were discussed with a view to their applicability in legal and law enforcement contexts.

Searching for the sequential line-up advantage: A distinctiveness explanation

Gronlund (2005) proposed that one factor leading to a sequential line-up advantage could be the greater likelihood of recollecting distinctive information about a perpetrator when using a sequential line-up. Since then questions have been raised about the robustness of the sequential advantage and the possible moderating role of line-up fairness and suspect position. We manipulated these factors as well as suspect/target distinctiveness in two experiments. A sequential advantage occurred only after encoding a distinctive target, both for biased line-ups (Experiment 1) and fair line-ups (Experiment 2). Remember-Know results were consistent with the greater use of a recall-to-reject strategy in target-absent sequential line-ups. This provided support for the first process-based explanation of the sequential line-up advantage. No consistent position effects were found, but this might be due to the line-up recognition paradigm used, in which each participant viewed a line-up for each of several targets. Theory-based explorations of eyewitness identification are necessary to continue to delineate the underpinnings of the sequential line-up advantage.

Change detection inflates confidence on a subsequent recognition task

A face viewed under good encoding conditions is more likely to be remembered than a face viewed under poor encoding conditions. In four experiments we investigated how encoding conditions affected confidence in recognising faces from line-ups. Participants performed a change detection task followed by a recognition task and then rated how confident they were in their recognition accuracy. In the first two experiments the same faces were repeated across trials. In the final two experiments novel faces were used on each trial. Target-present and target-absent line-ups were utilised. In each experiment participants had greater recognition confidence after change detection than after change blindness. The finding that change detection inflates confidence, even for inaccurate recognitions, indicates recognition certainty can be a product of perceived encoding conditions rather than authentic memory strength.

Identification accuracy for single- and double-perpetrator crimes: Does accomplice gender matter?

There is an important mismatch between empirical research on the accuracy of eyewitness identification and the real world of criminal investigation. Most research models single-perpetrator crimes, but in the real world, most crimes involve multiple perpetrators. This study examined how the number of perpetrators affects eyewitness identification by manipulating the gender of accomplices. Observers viewed a video of a staged crime. The crime was committed by a male or female perpetrator, who was presented alone or with an accomplice of the same or the opposite gender. The observers were then asked to identify the perpetrators from target-present or target-absent line-ups. The results revealed a double-perpetrator disadvantage, which was manifested in reduced identification accuracy on target-present line-ups. Importantly, however, the gender of the perpetrator or the accomplice had no effect on this disadvantage. This double-perpetrator disadvantage is attributed to the need to divide attention between two concurrent people, compared to single-culprit crimes, rather than an impairment of visual encoding processes. The implications of these findings are discussed.

Faces in Motion: Age‐Related Changes in Eyewitness Identification Performance in Simultaneous, Sequential, and Elimination Video Lineups

SummaryThe identification performance of children (5 to 6 years, n = 180; 9 to 10 years, n = 180) and adults (n = 180) was examined using three types of video lineup procedures: simultaneous, sequential and elimination. Participants viewed a videotaped staged theft and then attempted to identify the culprit from a target‐present or target‐absent video lineup. Correct identifications in simultaneous and elimination video lineups did not differ as a function of age. The sequential video lineup was associated with a reduction in correct identifications for both child groups compared with adults. With respect to the target‐absent lineup condition, the video elimination lineup was associated with an increase in correct rejection rates for adult witnesses. Age was also significantly associated with accuracy. Differences in correct rejection rates were observed between adults and children and also between the two child groups. Implications and future directions are discussed. Copyright © 2011 John Wiley & Sons, Ltd.

The Culprit in Target-Absent Lineups: Understanding Young Children’s False Positive Responding

Young children (4- to 7-years old; N = 59) and adults (N = 53) were shown a series of targets that were either familiar (i.e., popular cartoon characters) or unfamiliar (unknown human faces) to assess whether children’s false positive responding with target-absent lineups is driven by social factors to a greater degree than cognitive factors. Although children were able to produce correct identification rates with virtually 100% accuracy for the cartoon characters, they produced a significantly lower correct rejection rate compared to adults. Children also produced a significantly lower correct rejection rate for the human faces compared to adults. These data are discussed for understanding children’s identification evidence.

Exploring the effects of age and delay on children's person identifications: Verbal descriptions, lineup performance, and the influence of wildcards

We explored the effects of age and retention interval on several measures of children's person identification ability: verbal descriptions, lineup performance, and the success of a 'wildcard'--a photo of a silhouetted figure with a large question mark superimposed--in reducing children's tendency to choose from target-absent lineups. Children aged 5-7 years (N= 101) and 8-11 years (N= 109) were briefly exposed to an experimental confederate during a staged event. Either 1-2 days or 2 weeks later, children described the confederate and were then presented with either a target-present or -absent lineup. Within each group, approximately half of the children were presented with a wildcard and half were not. Target-present lineup performance improved as age increased. Compared to control children, children in the wildcard condition were more likely to correctly reject the target-absent lineup, and less likely to identify the innocent suspect. The wildcard did not influence children's target-present lineup accuracy, nor did delay exert an influence on any of our measures of lineup performance. These findings extend our knowledge of children's person identifications, as well as providing further support for the use of wildcards in photographic lineups.

A comparison of video and static photo lineups with child and adolescent witnesses

AbstractIn the UK video parades are the preferred method of identification employed in criminal cases. This policy implementation has been employed with little or no evidence concerning its validity. The reported research examines the effect of new video technology on children's identification evidence. The study compared 7–9 and 13–15‐year olds' ability to make identifications from either video or static photo lineups. Two hundred and fifteen participants witnessed a live event and then after a delay of 2–3 days viewed a target present (TP), or target absent (TA) video or photo lineup. For video and photo TP lineups, correct responses did not differ as a function of age. Video lineups produced lower rates of false identifications for the TA lineups, but only for adolescent witnesses. It is concluded that there is nothing contra‐indicated in the use of video identification procedures with children, and possibly certain benefits can accrue from its use. Copyright © 2009 John Wiley & Sons, Ltd.

Overhearing the Planning of A Crime: Do Adults Outperform Children As Earwitnesses?

This study examined the reliability of earwitnesses using an ecologically realistic experimental set-up. A total of 282 participants, distributed over three age-groups (7–9 vs. 11–13 year olds vs. adults), were exposed to an unfamiliar voice for 40 seconds. After a two week delay, they were presented with a 7-voice lineup. Half of the participants were exposed to a target-present lineup (TP), and the other half to a target-absent lineup (TA). For both types of lineups the participants performed poorly. In the TP-condition only the 11–13-year olds (with 27% correct identifications) performed above chance level. Furthermore, in the TA-condition all age-groups showed a high willingness to make an identification (overall mean = 53%). For both groups of children, voice identification co-varied significantly with speaking rate and pitch level, as did pitch variation for the youngest children. Neither factor correlated significantly with the adults’ identifications.