Evidence that photos promote rosiness for claims about the future

When people rapidly judge the truth of claims about the present or the past, a related but nonprobative photo can produce “truthiness,” an increase in the perceived truth of those claims (Newman, Garry, Bernstein, Kantner, & Lindsay, 2012). What we do not know is the extent to which nonprobative photos cause truthiness for the future. We addressed this issue in four experiments. In each experiment, people judged the truth of claims that the price of certain commodities (such as manganese) would increase (or decrease). Half of the time, subjects saw a photo of the commodity paired with the claim. Experiments 1A and 1B produced a “rosiness” bias: Photos led people to believe positive claims about the future but had very little effect on people’s belief in negative claims. In Experiment 2, rosiness occurred for both close and distant future claims. In Experiments 3A and 3B, we tested whether rosiness was tied to the perceived positivity of a claim. Finally, in Experiments 4A and 4B, we tested the rosiness hypothesis and found that rosiness was unique to claims about the future: When people made the same judgments about the past, photos produced the usual truthiness pattern for both positive and negative claims. Considered all together, our data fit with the idea that photos may operate as hypothesis-confirming evidence for people’s tendency to anticipate rosy future outcomes.     

Replications and Limitations of a Two-Factor Model of Child Witness Credibility

Two experiments are reported that test the idea that jurors perceive child witnesses in terms of a 2-factor model of credibility with the factors defined as cognitive ability and honesty (Leippe & Romanczyk, 1987; Ross, Millers, & Moran, 1989). In the first experiment, 300 mock jurors watched a realistic videotaped recreation of a sexual abuse trial and rated the credibility of the child witness. Mock jurors perceived the child witness in terms of 2 factors: cognitive ability and honesty. Only honesty predicted verdict. These findings were replicated in Experiment 2 ( N = 300) when only the child's testimony was presented and the perceptions of the child witness were not contaminated by the testimony of the other witnesses in the trial.     

Changing beliefs about past public events with believable and unbelievable doctored photographs

Doctored photographs can shape what people believe and remember about prominent public events, perhaps due to their apparent credibility. In three studies, subjects completed surveys about the 2012 London Olympic torch relay (Experiment 1) or the 2011 Royal Wedding of Prince William and Kate Middleton (Experiments 2–3). Some were shown a genuine photo of the event; others saw a doctored photo that depicted protesters and unrest. A third group of subjects saw a doctored photo whose inauthenticity had been made explicit, either by adding a written disclaimer (Experiment 1) or by making the digital manipulation deliberately poor (Experiments 2–3). In all three studies, doctored photos had small effects on a subset of subjects’ beliefs about the events. Of central interest though, comparable effects also emerged when the photos were overtly inauthentic. These findings suggest that cognitive mechanisms other than credibility – such as familiarity misattribution and mental imagery – can rapidly influence beliefs about past events even when the low credibility of a source is overt.     

Do incompatible alternatives in a testimony affect witness credibility?

The qualitative regulation of grain size allows witnesses to increase the accuracy of their reports by adding alternatives (e.g., “the robber concealed his face with a mask, with a stocking, or with a balaclava”). However, such answers may include incompatible alternatives which may make police officers and juries distrust witnesses. In four preregistered experiments, we tested the effect of information with incompatible alternatives on witness credibility. In Experiments 1a, 1b, and 1c, we presented two short testimonies, one with incompatible alternatives and another without and credibility was lower with incompatible alternatives. In Experiment 2, we told participants that witnesses could report several alternatives and the effect was reduced. We explain the effect of incompatible alternatives on credibility from participants' inferences that a witness producing an answer with incompatible alternatives is not confident in their memory and a failure to fully appreciate the advantages of adding alternatives.     

Susceptibility to postidentification feedback is affected by source credibility

How much a person is affected by postidentification feedback is dependent on the credibility of the person giving the feedback. Seven hundred and ninety participants across three experiments viewed a crime video, made judgments from a line‐up, were provided with co‐witness and/or outcome feedback (from police officers [high credibility] or children [low credibility]), and answered testimony‐relevant questions (e.g. How good a view did you get of the person in the video?). The aim was to find out how high versus low credibility co‐witness feedback affects a witness' retrospective judgments (Experiment 1) as well as estimations of these co‐witnesses' judgments (Experiment 2). Experiment 1 showed that the feedback effect was only observed when the co‐witness responses were attributed to a high credibility source. Experiment 2 showed that high credibility co‐witnesses were estimated to score higher on the testimony‐relevant questions as compared to low credibility co‐witnesses. Experiment 3 showed that outcome feedback (e.g. ‘you identified the suspect’) produces stronger effects on testimony‐relevant questions than co‐witness feedback. The implications of these findings are that when postidentification feedback is present, it is important to determine the source of this feedback. Copyright © 2008 John Wiley & Sons, Ltd.     

Witness Vetting: What Determines Detectives' Perceptions of Witness Credibility?

During the course of a criminal investigation witness vetting, a detective's process of determining the credibility and weight of witness information, can lead to errors in an investigation that can go virtually unchallenged. Witness confidence, opportunity to view, and type of information proffered were examined in relation to detective inferences about witness reliability, accuracy, and probable cause to arrest. Experiment 1 involved 39 sworn law enforcement officers, and experiment 2 involved 43 sworn law enforcement officers and 86 mock detectives. Participants viewed a digital recording depicting a witness describing a gas station robbery (Experiment 1) or a campus mugging (Experiment 2). Witness confidence and detectives' inferences about culprit information influenced the vetting process and lent credibility to a confident witness whose accuracy was objectively unknown. Furthermore, the evidence indicates that sworn law enforcement are comparable with untrained observers in their use of social inference cues (i.e. confidence) in determining witness credibility; however, social inference can be assuaged by the rational, rule‐governed, decision framework established for witness vetting. Social inference processes inherent in the detective‐witness dyad is influenced by legal procedures in vetting witness information. Copyright © 2013 John Wiley & Sons, Ltd.     

Context effects on the perceived physical attractiveness of faces

Four experiments were conducted to study the nature of context effects on the perceived physical attractiveness of faces. In Experiment 1, photos of faces scaled on attractiveness were presented in sets of three, with target faces appearing in the middle flanked by two context faces. The target faces were of average attractiveness, with the context faces being either high, average, or low in attractiveness. The effect of the context was one of assimilation, rather than contrast, regardless of whether the persons in the photos were portrayed to be associated. This result was interpreted in terms of a “generalized halo effect” for judgments of the physical attractiveness of stimuli within a group. Presenting the persons of a set as friends enhanced the perceived attractiveness of the target face but only when the context did not contain a face of low attractiveness. In Experiment 2, the assimilation effect was observed to carry over to influence ratings of the target faces several minutes after the context faces had been removed. Experiment 3 showed the assimilation effect to be robust regardless of whether the context was composed of two faces or one, but Experiment 4 showed the assimilation effect to be evident only when the context faces were presented simultaneously with the target.     

Perceptions of source efficacy and persuasion: Multiple mechanisms for source effects on attitudes

When communicators are perceived as likely to bring proposed outcomes to fruition, they have source efficacy. Although perceptions of source efficacy are common in persuasion settings, this construct has received little direct research attention. The present research explored how source efficacy may impact persuasion in different ways at different levels of motivation to process messages. Across three experiments, participants encountered message arguments of varying quality from a source manipulated to be relatively efficacious or inefficacious. When motivation to process the message was low, source efficacy served as a peripheral cue (Experiment 1). When motivation was high, efficacy information learned before the message biased processing of ambiguous messages (Experiment 2), but source efficacy learned after the message affected the amount of confidence people had in their message‐related thoughts (Experiment 3). These effects of source efficacy were distinct from effects of perceived source expertise/credibility. Copyright © 2011 John Wiley & Sons, Ltd.     

On the costs of accessible attitudes: detecting that the attitude object has changed

The present research examined whether individuals with more accessible attitudes have more difficulty detecting that the attitude object has changed. While being repeatedly exposed to photographs of undergraduates, participants either rehearsed their attitudes toward each photo or performed a control task. They then saw these original photos and computer-generated morphs representing varying degrees of change in an original. Participants in the attitude rehearsal condition required more time to correctly identify morphs that were similar to the original as "different" (Experiment 1) and made more errors in response to such morphs (Experiment 2). Experiment 3 revealed that participants with accessible attitudes perceived relatively less change; they were less likely to view a morph as a photo of a novel person and more likely to view it as a different photo of a person seen before. The costs and benefits of accessible attitudes are discussed.     

Readers' reliance on source credibility in the service of comprehension

The current project examined the impact of knowledge about the credibility of sources on readers' processing of texts. Participants read texts in which information about characters was provided by either a credible or a noncredible source; this information suggested that the character potentially possessed a particular trait. A subsequent text episode offered the opportunity for participants to apply any inferred trait to their understanding of unfolding story events. In Experiment 1, participants' moment-by-moment reading times indicated strong expectations for characters to behave in trait-consistent ways, with little effect of credibility on those expectations. Experiments 2 and 3 provided participants with additional encouragement to attend to credibility during reading, but these experiments also revealed little influence of credibility. In Experiment 4, in addition to being given added encouragement, participants were explicitly asked to evaluate the likelihood of future text events; under these conditions, expectations for story outcomes were influenced by the credibility of information sources. This influence was mediated by the degree to which participants self-reported relying on credibility during the task. These findings have implications for contemporary accounts of text comprehension, persuasion, and individual differences in credibility assessment. (PsycINFO Database Record (c) 2010 APA, all rights reserved).     

Affective theory of mind inferences contextually influence the recognition of emotional facial expressions

The recognition of emotional facial expressions is often subject to contextual influence, particularly when the face and the context convey similar emotions. We investigated whether spontaneous, incidental affective theory of mind inferences made while reading vignettes describing social situations would produce context effects on the identification of same-valenced emotions (Experiment 1) as well as differently-valenced emotions (Experiment 2) conveyed by subsequently presented faces. Crucially, we found an effect of context on reaction times in both experiments while, in line with previous work, we found evidence for a context effect on accuracy only in Experiment 1. This demonstrates that affective theory of mind inferences made at the pragmatic level of a text can automatically, contextually influence the perceptual processing of emotional facial expressions in a separate task even when those emotions are of a distinctive valence. Thus, our novel findings suggest that language acts as a contextual influence to the recognition of emotional facial expressions for both same and different valences.     

Examining subjective and physiological responses to norm violation using text-based vignettes

In this article, we describe a paradigm using text-based vignettes for the study of social and cultural norm violation. Towards this aim, a range of scenarios depicting instances of norm violations was generated and tested with respect to their ability in evoking subjective and physiological responses. In Experiment 1, participants evaluated 29 vignettes on how upsetting, excusable and realistic the described behaviour appeared to be. Based on those ratings we selected and extended three norm violation vignettes for Experiment 2 in which participants' physiological responses were obtained in addition to their subjective ratings. In both studies, the vignettes were successful in eliciting negative responses to norm violations and were significantly affected by the perceivers' level of ethnocultural empathy. The trait measure of cultural empathy further predicted facial electromyography (EMG) activity at muscle sites associated with disgust (M. Levator Labii), thereby suggesting a potential moral response to norm-violating scenarios. We discuss the methodological merits and implications of this vignettes paradigm for investigating perceived norm transgressions and make recommendations for future work.     

Effects of the Inclusion and Refutation of Peripheral Details on Eyewitness Credibility

The present study examines the effects of including trivial details in eyewitness testimony on witness credibility, as well as the effects of discrediting presented details. Participants ( N = 155) read 2 brief, contradictory depositions from fictional witnesses about a fictional car accident. One of the depositions included a short set of details unrelated to the accident itself. After participants rated the credibility of the witnesses, the trivial details were refuted and the participants rated the credibility of the witnesses again. Contrary to previous research (Bell & Loftus, 1989), the inclusion of trivial details had no effect on witness credibility. However, significant effects on witness credibility were obtained when the details were refuted. As expected, the credibility of the witness presenting the trivial details significantly decreased after detail refutation. More interestingly, refutation appeared to increase the credibility of the other witness.     

Biased lineup instructions and face identification from video images

Previous eyewitness memory research has shown that biased lineup instructions reduce identification accuracy, primarily by increasing false-positive identifications in target-absent lineups. Because some attempts at identification do not rely on a witness's memory of the perpetrator but instead involve matching photos to images on surveillance video, the authors investigated the effects of biased instructions on identification accuracy in a matching task. In Experiment 1, biased instructions did not affect the overall accuracy of participants who used video images as an identification aid, but nearly all correct decisions occurred with target-present photo spreads. Both biased and unbiased instructions resulted in high false-positive rates. In Experiment 2, which focused on video-photo matching accuracy with target-absent photo spreads, unbiased instructions led to more correct responses (i.e., fewer false positives). These findings suggest that investigators should not relax precautions against biased instructions when people attempt to match photos to an unfamiliar person recorded on video.     

Effects of postidentification feedback on eyewitness identification and nonidentification confidence

Two experiments investigated new dimensions of the effect of confirming feedback on eyewitness identification confidence using target-absent and target-present lineups and (previously unused) unbiased witness instructions (i.e., "offender not present" option highlighted). In Experiment 1, participants viewed a crime video and were later asked to try to identify the thief from an 8-person target-absent photo array. Feedback inflated witness confidence for both mistaken identifications and correct lineup rejections. With target-present lineups in Experiment 2, feedback inflated confidence for correct and mistaken identifications and lineup rejections. Although feedback had no influence on the confidence-accuracy correlation, it produced clear overconfidence. Confidence inflation varied with the confidence measure reference point (i.e., retrospective vs. current confidence) and identification response latency.     

Credibility judgments of narratives: language, plausibility, and absorption

Two experiments were conducted in order to find out whether textual features of narratives differentially affect credibility judgments made by judges having different levels of absorption (a disposition associated with rich visual imagination). Participants in both experiments were exposed to a textual narrative and requested to judge whether the narrator actually experienced the event he described in his story. In Experiment 1, the narrative varied in terms of language (literal, figurative) and plausibility (ordinary, anomalous). In Experiment 2, the narrative varied in terms of language only. The participants' perceptions of the plausibility of the story described and the extent to which they were absorbed in reading were measured. The data from both experiments together suggest that the groups applied entirely different criteria in credibility judgments. For high-absorption individuals, their credibility judgment depends on the degree to which the text can be assimilated into their own vivid imagination, whereas for low-absorption individuals it depends mainly on plausibility. That is, high-absorption individuals applied an experiential mental set while judging the credibility of the narrator, whereas low-absorption individuals applied an instrumental mental set. Possible cognitive mechanisms and implications for credibility judgments are discussed.