Application of artificial intelligence to eyewitness identification.

Artificial intelligence is already all around us, and its usage will only increase. Knowing its capabilities is critical. A facial recognition system (FRS) is a tool for law enforcement during suspect searches and when presenting photos to eyewitnesses for identification. However, there are no comparisons between eyewitness and FRS accuracy using video, so it is unknown whether FRS face matches are more accurate than eyewitness memory when identifying a perpetrator. Ours is the first application of artificial intelligence to an eyewitness experience, using a comparative psychology approach. As a first step to test system accuracy relative to eyewitness accuracy, participants and an open-source FRS (FaceNet) attempted perpetrator identification/match from lineup photos (target-present, target-absent) after exposure to real crime videos with varied clarity and perpetrator race. FRS used video probe images of each perpetrator to achieve similarity ratings for each corresponding lineup member. Using receiver operating characteristic analysis to measure discriminability, FRS performance was superior to eyewitness performance, regardless of video clarity or perpetrator race. Video clarity impacted participant performance, with the unclear videos yielding lower performance than the clear videos. Using confidence-accuracy characteristic analysis to measure reliability (i.e., the likelihood the identified suspect is the actual perpetrator), when the FRS identified faces with the highest similarity values, they were accurate. The results suggest FaceNet, or similarly performing systems, may supplement eyewitness memory for suspect searches and subsequent lineup construction and knowing the system's strengths and weaknesses is critical.

Capuchin monkeys' (Sapajus [Cebus] apella) categorization of photos of unknown male conspecifics suggests attention to fWHR and a dominance bias.

The ability to quickly perceive others' rank minimizes costs by helping individuals behave appropriately when interacting with strangers. Indeed, humans and at least some other species can quickly determine strangers' rank or dominance based only on physical features without observing others' interactions or behavior. Nonhuman primates can determine strangers' ranks by observing their interactions, and some evidence suggests that at least some cues to dominance, such as facial width-to-height ratio (fWHR), are also present in other primates. However, it is unknown whether they can determine strangers' rank simply by looking at their faces, rather than observing their interactions. If so, this would suggest selective pressure across the primates on both cues to dominance and the ability to detect those cues accurately. To address this, we examined the ability of male and female tufted capuchin monkeys (Sapajus [Cebus] apella) to categorize images of the faces of unknown conspecifics (Sapajus from different colonies) and humans (computer-generated and real) as dominant or nondominant based only on still images. Capuchins' categorization of unknown conspecific faces was consistent with fWHR, a cue to dominance, although there was a strong tendency to categorize strangers as dominant, particularly for males. This was true despite the continued correct categorization of known individuals. In addition, capuchins did not categorize human strangers in accordance with external pre-ratings of dominance by independent human raters, despite the availability of the same cue, fWHR. We consider these results in the context of capuchin socio-ecology and what they mean for the evolution of rapid decision-making in social contexts.

Looking more criminal: It's not so black and white.

Prior research regarding the influence of face structure on character judgments and first impressions reveals that bias for certain face-types is ubiquitous, but these studies primarily used decontextualized White faces for stimuli. Given the disadvantages Black men face in the legal system, this study aimed to investigate whether the criminal face-type presented in the context of crime influenced different legal system-type judgments as a function of perpetrator race. In a mixed-model design, participants saw Black and White computer-generated faces that varied in criminality presented with either violent or nonviolent crime scenarios. At test, participants attempted to identify the original perpetrator from a photo array, along with providing penalty severity judgments for the crime committed. Results indicate that when crimes were violent, participants meted harsher penalties overall to Black faces or to high-criminality faces identified as the perpetrator. Furthermore, for violent crimes, participants were more likely to select a face from the photo array that was higher/equally as high in criminality rating relative to the actual perpetrator when memory failed or when the perpetrator was Black. Overall, the findings suggest that when people are making judgments that could influence another's livelihood, they may rely heavily on facial cues to criminality and the nature of the crime; and this is especially the case for Black faces presented in the context of violent crime. The pattern of results provides further support for the pervasive stereotype of Black men as criminal, even in our racially diverse sample wherein 36% identified as Black.

Assessing aphantasia prevalence and the relation of self-reported imagery abilities and memory task performance.

Aphantasia is the experience of having little to no visual imagery. We assessed the prevalence rate of aphantasia in 5,010 people from the general population of adults in the United States through self-report and responses to two visual imagery scales. The self-reported prevalence rate of aphantasia was 8.9% in this sample. However, not all participants who reported themselves as aphantasic showed low-imagery profiles on the questionnaire scales, and scale prevalence was much lower (1.5%). Self-reported aphantasic individuals reported lower dream frequencies and self-talk and showed poorer memory performance compared to individuals who reported average and high mental imagery. Self-reported aphantasic individuals showed a greater preference for written instruction compared to video instruction for learning a hypothetical new task although there were differences for men and women in this regard. Categorizing aphantasia using a scale measure and relying on self-identification may provide a more consistent picture of who lacks visual imagery.

Nudges for Judges: An Experiment on the Effect of Making Sentencing Costs Explicit.

Judges are typically tasked to consider sentencing benefits but not costs. Previous research finds that both laypeople and prosecutors discount the costs of incarceration when forming sentencing attitudes, raising important questions about whether professional judges show the same bias during sentencing. To test this, we used a vignette-based experiment in which Minnesota state judges (N = 87) reviewed a case summary about an aggravated robbery and imposed a hypothetical sentence. Using random assignment, half the participants received additional information about plausible negative consequences of incarceration. As predicted, our results revealed a mitigating effect of cost exposure on prison sentence term lengths. Critically, these findings support the conclusion that policies that increase transparency in sentencing costs could reduce sentence lengths, which has important economic and social ramifications.

He did it! Or did I just see him on Twitter? Social media influence on eyewitness identification.

Eyewitness identification is fallible, and suggestive post-event information is known to facilitate error; however, whether social media valence affects identification decisions is unknown. After viewing crime videos of various race perpetrators, participants saw post-event Twitter photos of the perpetrator or a foil that varied in valence. Participants attempted identification from a lineup including both individuals and rated the confidence and source (i.e., video, Twitter) of their selection. Results showed that Twitter photos of the perpetrator increased the likelihood of accurate identification and related confidence, whereas seeing the foil reduced the likelihood of a correct identification and related confidence. Remembering the perpetrator from the crime influenced correct identification, while remembering other incorrect sources (e.g., Twitter) only lead to misidentification. Twitter valence and perpetrator race did not impact outcomes. Results suggest that difficulty in identifying a perpetrator is underpinned by source monitoring confusion which is exacerbated by viewing social media that includes innocent suspects.

Correctional "Free Lunch"? Cost Neglect Increases Punishment in Prosecutors.

Prosecutors can influence judges' sentencing decisions by the sentencing recommendations they make-but prosecutors are insulated from the costs of those sentences, which critics have described as a correctional "free lunch." In a nationally distributed survey experiment, we show that when a sample of (n=178) professional prosecutors were insulated from sentencing cost information, their prison sentence recommendations were nearly one-third lengthier than sentences rendered following exposure to direct cost information. Exposure to a fiscally equivalent benefit of incarceration did not impact sentencing recommendations, as predicted. This pattern suggests that prosecutors implicitly value incorporating sentencing costs but selectively neglect them unless they are made explicit. These findings highlight a likely but previously unrecognized contributor to mass incarceration and identify a potential way to remediate it.

What's in a face? The role of facial features in ratings of dominance, threat, and stereotypicality.

Faces judged as stereotypically Black are perceived negatively relative to less stereotypical faces. In this experiment, artificial faces were constructed to examine the effects of nose width, lip fullness, and skin reflectance, as well as to study the relations among perceived dominance, threat, and Black stereotypicality. Using a multilevel structural equation model to isolate contributions of the facial features and the participant demographics, results showed that stereotypicality was related to wide nose, darker reflectance, and to a lesser extent full lips; threat was associated with wide nose, thin lips, and low reflectance; dominance was mainly related to nose width. Facial features explained variance among faces, suggesting that face-type bias in this sample was related to specific face features rather than particular characteristics of the participant. People's perceptions of relations across these traits may underpin some of the sociocultural disparities in treatment of certain individuals by the legal system.

Training away face-type bias: perception and decisions about emotional expression in stereotypically Black faces.

Prior research indicates that stereotypical Black faces (e.g., wide nose, full lips) are perceived negatively relative to non-stereotypical faces (face-type bias). The current study investigated whether stereotypical faces may bias the interpretation of a neutral facial expression to seem threatening. Moreover, could biased responses be trained away with feedback? In two experiments, stimuli (face images) were presented in a speeded identification task that included corrective feedback, and participants indicated whether the face stimuli were stereotypical or not and threatening or not. Stimuli were pre-rated by face-type (stereotypical, non-stereotypical) and expression (neutral, threatening). Computational modeling based on General Recognition Theory indicated that training increased perceptual discriminability between all the faces. By the end of training (in both experiments), discriminability for emotional expression was slightly higher for stereotypical faces. Model parameters (for both experiments) also showed that, early in training, decision boundaries were more biased toward the threatening response for stereotypical faces relative to non-stereotypical faces. The results suggest that decision bias may be malleable with training.

Slippery scales: Cost prompts, but not benefit prompts, modulate sentencing recommendations in laypeople.

Do people punish more than they would if the decision costs were more transparent? In two Internet-based vignette experiments, we tested whether juvenile sentencing recommendations among U.S. adults are responsive to variation in the salience of the taxpayer costs and public safety benefits of incarceration. Using a 2 Cost (present vs. absent) x 2 Benefit (present vs. absent) factorial design, Experiment 1 (N = 234) found that exposure to information about the direct costs of incarcerating the juvenile offender reduced sentencing recommendations by about 28%, but exposure to the public safety benefits had no effect on sentences. Experiment 2 (N = 301) manipulated cost-benefit salience by asking participants to generate their own list of costs of incarceration, benefits of incarceration, or an affectively neutral, unrelated word list. Results revealed a similar selective effect whereby sentencing recommendations were reduced in the cost condition relative to the benefits and control conditions, but sentences in the benefit condition did not differ from the control. This combined pattern suggests that laypeople selectively neglect to factor cost considerations into these judgments, thereby inflating their support for punishment, unless those costs are made salient. These findings contribute to the debate on transparency in sentencing.

Afraid of one afraid of all: When threat associations spread across face-types.

Fear can be acquired for objects not inherently associated with threat (e.g. birds), and this threat may generalize from prototypical to peripheral category members (e.g. crows vs. penguins). When categorizing people, pervasive stereotypes link Black men to assumed violence and criminality. Faces with Afrocentric features (prototypical) are more often associated with threat and criminality than non-Afrocentric (peripheral) faces regardless of whether the individual is Black or White. In this study, using a priming paradigm, threat associations related to negative racial stereotypes were tested as a vehicle for spreading fear across face-type categories. Results showed more negative than positive judgments for White face targets but only when the prime was primarily non-Afrocentric (i.e. Eurocentric). Black face targets were judged more negatively than positively regardless of prime. This suggests some cognitive processes related to threat generalizations of objects extend to complex social categories.

Justice at any cost? The impact of cost-benefit salience on criminal punishment judgments.

This study investigated the effect of cost-benefit salience on simulated criminal punishment judgments. In two vignette-based survey experiments, we sought to identify how the salience of decision costs influences laypeople's punishment judgments. In both experiments (N1  = 109; N2  = 398), undergraduate participants made sentencing judgments with and without explicit information about the direct, material costs of incarceration. Using a within-subjects design, Experiment 1 revealed that increasing the salience of incarceration costs mitigated punishments. However, when costs were not made salient, punishments were no lower than those made when the costs were externalized (i.e., paid by a third party). Experiment 2 showed the same pattern using a between-subjects design. We conclude that, when laypeople formulate sentencing attitudes without exposure to the costs of the punishment, they are prone to discount those costs, behaving as if punishment is societally cost-free. However, when cost information is salient, they utilize it, suggesting the operation of a genuine, albeit labile, punishment preference. We discuss the implications of these findings for psychological theories of decision making and for sentencing policy, including the degree of transparency about the relevant costs of incarceration during the decision process.

When a face type is perceived as threatening: Using general recognition theory to understand biased categorization of Afrocentric faces.

Prior research indicates that stereotypical Black faces (e.g., wide nose, full lips: Afrocentric) are often associated with crime and violence. The current study investigated whether stereotypical faces may bias the interpretation of facial expression to seem threatening. Stimuli were prerated by face type (stereotypical, nonstereotypical) and expression (neutral, threatening). Later in a forced-choice task, different participants categorized face stimuli as stereotypical or not and threatening or not. Regardless of prerated expression, stereotypical faces were judged as more threatening than were nonstereotypical faces. These findings were supported using computational models based on general recognition theory (GRT), indicating that decision boundaries were more biased toward the threatening response for stereotypical faces than for nonstereotypical faces. GRT analysis also indicated that perception of face stereotypicality and emotional expression are dependent, both across categories and within individual categories. Higher perceived stereotypicality predicts higher perception of threat, and, conversely, higher ratings of threat predict higher perception of stereotypicality. Implications for racial face-type bias influencing perception and decision-making in a variety of social and professional contexts are discussed.

The effects of prayer on attention resource availability and attention bias.

Two experiments were used to measure the effects of prayer, contemplation, or a control activity on attention resource capacity and attention bias. Results from a dual-task test in Experiment 1 indicated that allowing participants to pray about an issue in their lives improved subsequent task performance, but only for individuals who score highly on a measure of religiosity. Experiment 2 suggested that praying about a problem can bias attention in a word-search task. Similar effects were not observed for control activities. Thus, at least for people most likely to engage in religious behavior, praying about a problem appeared to liberate cognitive resources that are presumably otherwise consumed by worry and rumination, leaving individuals better able to process other information, and additionally to bias attention to favor detection of problem-relevant information. These effects suggest one cognitive process (attention) that may underlie how people come to perceive answers to prayers.