scholarly journals Digital Detectives: Websleuthing Reduces Eyewitness Identification Accuracy in Police Lineups

2021 ◽  
Vol 12 ◽  
Author(s):  
Camilla Elphick ◽  
Richard Philpot ◽  
Min Zhang ◽  
Avelie Stuart ◽  
Graham Pike ◽  
...  
Keyword(s):  
Social Media ◽  
Eyewitness Identification ◽  
Identification Accuracy ◽  
Directed Search ◽  
Filler Task ◽  
Online Study ◽  
Social Media Site ◽  
Police Lineup ◽  
Mock Crime ◽  
Lineup Identification

Eyewitnesses to crimes sometimes search for a culprit on social media before viewing a police lineup, but it is not known whether this affects subsequent lineup identification accuracy. The present online study was conducted to address this. Two hundred and eighty-five participants viewed a mock crime video, and after a 15–20 min delay either (i) viewed a mock social media site including the culprit, (ii) viewed a mock social media site including a lookalike, or (iii) completed a filler task. A week later, participants made an identification from a photo lineup. It was predicted that searching for a culprit on social media containing the lookalike (rather than the culprit) would reduce lineup identification accuracy. There was a significant association between social media exposure and lineup accuracy for the Target Present lineup (30% more of the participants who saw the lookalike on social media failed to positively identify the culprit than participants in the other conditions), but for the Target Absent lineup (which also included the lookalike) there was no significant association with lineup identification accuracy. The results suggest that if an eyewitness sees a lookalike (where they are expecting to see the culprit) when conducting a self-directed search on social media, they are less likely to subsequently identify the culprit in the formal ID procedure.

scholarly journals The Effect of Pre-Event Instructions on Eyewitness Identification Stage 1 Registered Report Manuscript

2021 ◽  
Author(s):  
Mario J. Baldassari ◽  
Kara N. Moore ◽  
Ira Hyman ◽  
LORRAINE HOPE ◽  
Eric Mah ◽  
...  
Keyword(s):  
Systematic Review ◽  
Exposure Duration ◽  
Eyewitness Identification ◽  
Identification Accuracy ◽  
Identification Performance ◽  
Identification Stage ◽  
Lineup Identification ◽  
Stage 1 ◽  
Future Work

Research on eyewitness identification often involves exposing participants to a simulated crime and later testing memory using a lineup. We conducted a systematic review showing that pre-event instructions, instructions given before event exposure, are rarely reported and those that are reported vary in the extent to which they warn participants about the nature of event or tasks. At odds with the experience of actual witnesses, some studies use pre-event instructions explicitly warning participants of the upcoming crime and lineup task. Both the basic and applied literature provide reason to believe that pre-event instructions may impact eyewitness identification performance. In Experiment 1, we will test the effect of pre-event instructions on lineup identification decisions and confidence. Participants will receive non-specific pre-event instructions (i.e., “watch this video”) or eyewitness pre-event instructions (i.e., “watch this crime video, you’ll complete a line-up later”) and complete a culprit absent or present lineup. In Experiment 2, we will manipulate exposure duration and pre-event instructions to determine if pre-event instructions differentially impact high or low quality eyewitness events. If pre-event instructions impact eyewitness identification accuracy, then the findings of existing studies need to be considered in the context of their pre-event instructions and future work will be needed to determine how instructions interact with existing systems and estimator variables.

scholarly journals The Relationship Between Eyewitness Confidence and Identification Accuracy: A New Synthesis

2017 ◽  
Vol 18 (1) ◽  
pp. 10-65 ◽  
Author(s):  
John T. Wixted ◽  
Gary L. Wells
Keyword(s):  
Eyewitness Identification ◽  
Police Department ◽  
Field Studies ◽  
Information Value ◽  
Identification Accuracy ◽  
High Confidence ◽  
Testing Conditions ◽  
Eyewitness Confidence ◽  
New Synthesis ◽  
Mock Crime

Summary The U.S. legal system increasingly accepts the idea that the confidence expressed by an eyewitness who identified a suspect from a lineup provides little information as to the accuracy of that identification. There was a time when this pessimistic assessment was entirely reasonable because of the questionable eyewitness-identification procedures that police commonly employed. However, after more than 30 years of eyewitness-identification research, our understanding of how to properly conduct a lineup has evolved considerably, and the time seems ripe to ask how eyewitness confidence informs accuracy under more pristine testing conditions (e.g., initial, uncontaminated memory tests using fair lineups, with no lineup administrator influence, and with an immediate confidence statement). Under those conditions, mock-crime studies and police department field studies have consistently shown that, for adults, (a) confidence and accuracy are strongly related and (b) high-confidence suspect identifications are remarkably accurate. However, when certain non-pristine testing conditions prevail (e.g., when unfair lineups are used), the accuracy of even a high-confidence suspect ID is seriously compromised. Unfortunately, some jurisdictions have not yet made reforms that would create pristine testing conditions and, hence, our conclusions about the reliability of high-confidence identifications cannot yet be applied to those jurisdictions. However, understanding the information value of eyewitness confidence under pristine testing conditions can help the criminal justice system to simultaneously achieve both of its main objectives: to exonerate the innocent (by better appreciating that initial, low-confidence suspect identifications are error prone) and to convict the guilty (by better appreciating that initial, high-confidence suspect identifications are surprisingly accurate under proper testing conditions).

scholarly journals Eyewitness Identification and Distinctive Features: When Similarity Matters

2020 ◽  
Author(s):  
Jamal K. Mansour ◽  
Jennifer L Beaudry
Keyword(s):  
Eyewitness Identification ◽  
Identification Accuracy ◽  
Correct Identification ◽  
Sequential Lineups ◽  
Distinctive Features ◽  
Simultaneous Lineups ◽  
Innocent Suspect ◽  
Mock Crime

In four experiments, we investigated theoretical and practical issues around eyewitness identification accuracy and confidence for tattooed suspects. We varied how tattoos were treated in lineups (Experiments 1 and 2) and the match between the suspect’s tattoo the perpetrator’s tattoo (Experiments 3 and 4). We replicated the finding that modifying lineup photographs to prevent a tattooed suspect from standing out mitigates the risk of innocent suspect identifications. We also demonstrated that sequential lineups (cf. simultaneous) do not mitigate the risk of biased lineups when the suspect stands out because of a tattoo. Contrary to previous research in which biased lineups did not impact correct identification rates differentially by lineup type, we found that biased lineups decreased correct identifications in sequential, but not simultaneous, lineups. Additionally, we found that the tattoo worn by an innocent suspect need not be identical to that of the perpetrator—similar placement and designs also inflate innocent suspect identifications, although a tattoo in a different location with a different design protected innocent suspects. Finally, our data indicate that when researching distinctive marks in lineups, researchers should request descriptions from the eyewitness-participants following the mock crime in order to determine whether the witness noticed the distinctive mark.

scholarly journals Optimizing the selection of fillers in police lineups

2021 ◽  
Vol 118 (8) ◽  
pp. e2017292118
Author(s):  
Melissa F. Colloff ◽  
Brent M. Wilson ◽  
Travis M. Seale-Carlisle ◽  
John T. Wixted
Keyword(s):  
Signal Detection ◽  
Signal Detection Theory ◽  
Eyewitness Identification ◽  
Formal Model ◽  
White Male ◽  
Detection Theory ◽  
Facial Features ◽  
Police Lineup ◽  
Mock Crime ◽  
Selection Of

A typical police lineup contains a photo of one suspect (who is innocent in a target-absent lineup and guilty in a target-present lineup) plus photos of five or more fillers who are known to be innocent. To create a fair lineup in which the suspect does not stand out, two filler selection methods are commonly used. In the first, fillers are selected if they are similar in appearance to the suspect. In the second, fillers are selected if they possess facial features included in the witness’s description of the culprit (e.g., “20-y-old white male”). The police sometimes use a combination of the two methods by selecting description-matched fillers whose appearance is also similar to that of the suspect in the lineup. Decades of research on which approach is better remains unsettled. Here, we tested a counterintuitive prediction made by a formal model based on signal detection theory: From a pool of acceptable description-matched photos, selecting fillers whose appearance is otherwise dissimilar to the suspect should increase the hit rate without affecting the false-alarm rate (increasing discriminability). In Experiment 1, we confirmed this prediction using a standard mock-crime paradigm. In Experiment 2, the effect on discriminability was reversed (as also predicted by the model) when fillers were matched on similarity to the perpetrator in both target-present and target-absent lineups. These findings suggest that signal-detection theory offers a useful theoretical framework for understanding eyewitness identification decisions made from a police lineup.

scholarly journals Eyewitness identification performance is not affected by time-of-day optimality

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Sergii Yaremenko ◽  
Melanie Sauerland ◽  
Lorraine Hope
Keyword(s):  
Eyewitness Identification ◽  
Time Of Day ◽  
Decision Time ◽  
Identification Accuracy ◽  
Optimal Time ◽  
Identification Performance ◽  
Accurate Identification ◽  
Facial Stimuli ◽  
Time Accuracy ◽  
Accuracy Relationship

AbstractThe circadian rhythm regulates arousal levels throughout the day and determines optimal periods for engaging in mental activities. Individuals differ in the time of day at which they reach their peak: Morning-type individuals are at their best in the morning and evening types perform better in the evening. Performance in recall and recognition of non-facial stimuli is generally superior at an individual’s circadian peak. In two studies (Ns = 103 and 324), we tested the effect of time-of-testing optimality on eyewitness identification performance. Morning- and evening-type participants viewed stimulus films depicting staged crimes and made identification decisions from target-present and target-absent lineups either at their optimal or non-optimal time-of-day. We expected that participants would make more accurate identification decisions and that the confidence-accuracy and decision time-accuracy relationships would be stronger at optimal compared to non-optimal time of day. In Experiment 1, identification accuracy was unexpectedly superior at non-optimal compared to optimal time of day in target-present lineups. In Experiment 2, identification accuracy did not differ between the optimal and non-optimal time of day. Contrary to our expectations, confidence-accuracy relationship was generally stronger at non-optimal compared to optimal time of day. In line with our predictions, non-optimal testing eliminated decision-time-accuracy relationship in Experiment 1.

scholarly journals Medicated bodies: Mental distress, social media and affect

2016 ◽  
Vol 20 (2) ◽  
pp. 549-563 ◽  
Author(s):  
Ian Tucker ◽  
Lewis Goodings
Keyword(s):  
Mental Health ◽  
Social Media ◽  
Mental Distress ◽  
The Body ◽  
Psychiatric Medication ◽  
Social Media Site ◽  
Health Social Media ◽  
Care Practices ◽  
The Impact

Social media are increasingly being recruited into care practices in mental health. This article analyses how a major new mental health social media site ( www.elefriends.org.uk ) is used when trying to manage the impact of psychiatric medication on the body. Drawing on Henri Bergson’s concept of affection, analysis shows that Elefriends is used at particular moments of reconfiguration (e.g. change in dosage and/or medication), periods of self-experimentation (when people tailor their regimen by altering prescriptions or ceasing medication) and when dealing with a present bodily concern (showing how members have a direct, immediate relationship with the site). In addition, the analysis illustrates how users have to structure their communication to try to avoid ‘triggering’ distress in others. The article concludes by pointing to the need to focus on the multiple emerging relationships between bodies and social media in mental health, due to the ways the latter are becoming increasingly prominent technologies through which to experience the body when distressed.

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