R. C. L. Lindsay

Eyewitness Accuracy Rates in Sequential and Simultaneous Lineup Presentations: A Meta-Analytic Comparison

Most police lineups use a simultaneous presentation technique in which eyewitnesses view all lineup members at the same time. Lindsay and Wells (R. C. L. Lindsay & G. L. Wells, 1985) devised an alternative procedure, the sequential lineup, in which witnesses view one lineup member at a time and decide whether or not that person is the perpetrator prior to viewing the next lineup member. The present work uses the technique of meta-analysis to compare the accuracy rates of these presentation styles. Twenty-three papers were located (9 published and 14 unpublished), providing 30 tests of the hypothesis and including 4,145 participants. Results showed that identification of perpetrators from target-present lineups occurs at a higher rate from simultaneous than from sequential lineups. However, this difference largely disappears when moderator variables approximating real world conditions are considered. Also, correct rejection rates were significantly higher for sequential than simultaneous lineups and this difference is maintained or increased by greater approximation to real world conditions. Implications of these findings are discussed.

Children's Conceptual Knowledge of Lying and its Relation to Their Actual Behaviors: Implications for Court Competence Examinations

Child witnesses must undergo a competence examination in which they must show appropriate conceptual understanding of lying and truth-telling, and promise to tell the truth. Three experiments (Ns = 123, 103, 177) were conducted to address the assumptions underlying the court competence examination that (1) children who understand lying and its moral implications are less likely to lie and (2) discussing the conceptual issues concerning lying and having children promising to tell the truth promotes truth-telling. Both measures of lying and understanding of truth- and lie-telling were obtained from children between 3 and 7 years of age. Most children demonstrated appropriate conceptual knowledge of lying and truth-telling and the obligation to tell the truth, but many of the same children lied to conceal their own transgression. Promising to tell the truth significantly reduced lying. Implications for legal systems are discussed.

What price justice? Exploring the relationship of lineup fairness to identification accuracy.

Doob and Kirshenbaum (1973) and Wells, Leippe, and Ostrom (1979) demonstrated that some real-world lineups have been constructed such that the suspect can be identified by mock witnesses given only a general description of the criminal. The authors of both studies suggest that “fair” lineups should contain foils that resemble the suspect in general physical appearance. Neither study considers the possible cost of such “fair” lineups in terms of lost convictions of guilty suspects. A staged crime paradigm was used to evaluate the costs and benefits of “fair” lineups. Unsuspecting witnesses (n=96) to a staged crime were given the opportunity to identify a criminal (confederate) from relatively fair or unfair lineups (six-picture arrays, varying high versus low foil similarity). One fair and one unfair lineup contained a picture of the criminal (criminal-present lineups) while one fair and one unfair lineup contained a picture of an innocent suspect who resembled the criminal (criminal-absent lineups). In the criminal justice system only identifications of the criminal or the innocent suspect lead to further proceedings. The results indicate that high-similarity lineups produced less identifications of the criminal and of the innocent suspect than low-similarity lineups. However, the reduction in identifications of the criminal was much less dramatic than the reduction of identifications of the innocent suspect. A Bayesian analysis (Wells & Lindsay, 1980) of the data led to the further conclusion that identification evidence obtained from relatively fair high-similarity lineups is superior to similar evidence obtained from relatively unfair low-similarity lineups. The cost (in lost convictions of guilty suspects) of using fair lineups (high foil similarity) appears to be rather small.

Eyewitness accuracy rates in police showup and lineup presentations: a meta-analytic comparison.

Meta-analysis is used to compare identification accuracy rates in showups and lineups. Eight papers were located, providing 12 tests of the hypothesis and including 3013 participants. Results indicate that showups generate lower choosing rates than lineups. In target present conditions, showups and lineups yield approximately equal hit rates, and in target absent conditions, showups produce a significantly higher level of correct rejections. False identification rates are approximately equal in showups and lineups when lineup foil choices are excluded from analysis. Dangerous false identifications are more numerous for showups when an innocent suspect resembles the perpetrator. Function of lineup foils, assessment strategies for false identifications, and the potential impact of biases in lineup practice are suggested as additional considerations in evaluation of showup versus lineup efficacy.

Mug shot exposure prior to lineup identification: Interference, transference, and commitment effects

The effects of viewing mug shots on subsequent identification performance are as yet unclear. Two experiments used a live staged-crime paradigm to determine if interpolated eyewitness exposure to mug shots caused interference, unconscious transference, or commitment effects influencing subsequent lineup accuracy. Experiment 1 (N = 104) tested interference effects. Similar correct decision rates were obtained for the mug shot and no mug shot groups from both perpetrator-present and absent lineups. Experiment 2 (N = 132) tested for commitment and transference effects. Results showed that the commitment group made significantly more incorrect identifications than either the control or the transference group, which had similar false-identification rates. Commitment effects present a serious threat to identification accuracy from lineups following mug shot searches.

The impact of protective shields and videotape testimony on conviction rates in a simulated trial of child sexual abuse

In Experiment 1 mock jurors watched a videotape simulation of a sexual abuse trial that included a 10-year-old child witness testifying in one of three different modalities: (1) The child testified in court while directly confronting the defendant (open court condition). (2) The child testified in court with a protective shield placed between the child and the defendant (shield condition). (3) The child testified outside the courtroom and the childs testimony was presented to the jury and the defendant on a video monitor (video condition). The mock jurors judged the guilt of the defendant after watching the entire trial. The modality of the childs testimony had no impact on conviction rates. In Experiment 2 subjects watched the same trial that was used in Experiment 1. The trial was stopped immediately after the child testified (the child was the first witness to take the stand), and subjects judged the guilt of the defendant. The modality of the childs testimony had a significant impact on conviction rates. Subjects in the open court condition were more likely to convict the defendant than subjects in the shield and videotape conditions. These findings are relevant to Supreme Court decisions regarding the use of protective devices with child witnesses.

Using mug shots to find suspects

The authors examined the use of mug shots as an investigative tool. Data are reported from 3 staged-crime experiments (N = 365) exploring the effects on mug-shot selections of number of faces seen before the confederate criminals, of biased procedures, and of sorting pictures to fit the description of the criminal. The confederate was frequently selected from mug shots, and few innocent people were selected. Selections of faces declined with number of pictures viewed before the confederates. Biased instructions and clothing bias increased choices of innocent people but not of guilty people. More innocent faces were selected when the pictures matched the confederates description than when the pictures were not sorted to match the confederates description. Viewing mug shots had no effect on subsequent identifications in lineups. Implications for police use of mug shots are discussed.

Confidence and Accuracy of Eyewitness Identification from Lineups

Recent studies of confidence-accuracy correlations in eyewitness-identification experiments have produced highly variable results (Deffenbacher, 1980; Wells & Murray, 1984) with some correlations near 0 (Malpass & Devine, 1981) and others as high as 0.5 (Brigham et al., 1982). Much of this variability may be accounted for by differences, in the design of the research. Specifically, lineup experiments in which the to-be-identified person (target) is always present tend to produce higher confidence-accuracy correlations than studies also providing blank or target-absent lineups replacing the target with a lookalike. A reanalysis of previously collected data (Lindsay & Wells, 1980; Wallbridge & Lindsay, 1982) revealed that lineup foils (nontargets) were identified with significantly less confidence than targets or lookalikes but that targets and lookalikes were identified with equal confidence. Two experiments were conducted to test the hypothesis that confidence of identification is a function of the similarity of the identified person to the original target. The first experiment using nonstudent subjects (n=53) and multiple targets (n=14) to increase generalizability, demonstrated that the person in the lineup who most closely resembled the target was identified with the highest mean level of confidence. The second experiment examined confidence in identification following a crime staged for 260 introductory psychology students. The results indicated that the similarity of foils to the target (established by independent ratings) was predictive of both the frequency and confidence of identification of faces.

Multiple independent identification decisions: a method of calibrating eyewitness identifications.

Two experiments (N = 147 and N = 90) explored the use of multiple independent lineups to identify a target seen live. In Experiment 1, simultaneous face, body, and sequential voice lineups were used. In Experiment 2, sequential face, body, voice, and clothing lineups were used. Both studies demonstrated that multiple identifications (by the same witness) from independent lineups of different features are highly diagnostic of suspect guilt (G. L. Wells & R. C. L. Lindsay, 1980). The number of suspect and foil selections from multiple independent lineups provides a powerful method of calibrating the accuracy of eyewitness identification. Implications for use of current methods are discussed.

A Preidentification Questioning Effect: Serendipitously Increasing Correct Rejections

A study designed to test the effects of delay between crime and lineup on identification accuracy produced an unusually high rate of correct rejection from target-absent, simultaneous lineups (J. E. Dysart, 1999). Examining the procedures indicated that one question included in a preidentification questionnaire differed from those used previously. The question asked witnesses if they believed they would be able to correctly reject a target-absent lineup. An experiment (N = 138) was conducted to explore the impact of preidentification questions, including this new question, on witness accuracy. Results revealed that asking witnesses these questions, prior to viewing the lineup, significantly increased correct rejections of target-absent simultaneous lineups.