Investigating Predictors of Superior Face Recognition Ability in Police Super‐recognisers

There are large individual differences in the ability to recognise faces. Super‐recognisers are exceptionally good at face memory tasks. In London, a small specialist pool of police officers (also labelled ‘super‐recognisers’ by the Metropolitan Police Service) annually makes 1000's of suspect identifications from closed‐circuit television footage. Some suspects are disguised, have not been encountered recently or are depicted in poor quality images. Across tests measuring familiar face recognition, unfamiliar face memory and unfamiliar face matching, the accuracy of members of this specialist police pool was approximately equal to a group of non‐police super‐recognisers. Both groups were more accurate than matched control members of the public. No reliable relationships were found between the face processing tests and object recognition. Within each group, however, there were large performance variations across tests, and this research has implications for the deployment of police worldwide in operations requiring officers with superior face processing ability. Copyright © 2016 John Wiley & Sons, Ltd.     

The other-race effect does not rely on memory: Evidence from a matching task

Viewers are typically better at remembering faces from their own race than from other races; however, it is not yet established whether this effect is due to memorial or perceptual processes. In this study, UK and Egyptian viewers were given a simultaneous face-matching task, in which the target faces were presented upright or upside down. As with previous research using face memory tasks, participants were worse at matching other-race faces than own-race faces and showed a stronger face inversion effect for own-race faces. However, subjects' performance on own and other-race faces was highly correlated. These data provide strong evidence that difficulty in perceptual encoding of unfamiliar faces contributes substantially to the other-race effect and that accounts based entirely on memory cannot capture the full data. Implications for forensic settings are also discussed.     

The other-race effect does not rely on memory: Evidence from a matching task

Viewers are typically better at remembering faces from their own race than from other races; however, it is not yet established whether this effect is due to memorial or perceptual processes. In this study, UK and Egyptian viewers were given a simultaneous face-matching task, in which the target faces were presented upright or upside down. As with previous research using face memory tasks, participants were worse at matching other-race faces than own-race faces and showed a stronger face inversion effect for own-race faces. However, subjects' performance on own and other-race faces was highly correlated. These data provide strong evidence that difficulty in perceptual encoding of unfamiliar faces contributes substantially to the other-race effect and that accounts based entirely on memory cannot capture the full data. Implications for forensic settings are also discussed.     

Super-Recognisers show an advantage for other race face identification

The accurate identification of an unfamiliar individual from a face photo is a critical factor in several applied situations (e.g., border control). Despite this, matching faces to photographic ID is highly prone to error. In lieu of effective training measures, which could reduce face matching errors, the selection of “super-recognisers” (SRs) provides the most promising route to combat misidentification or fraud. However, to date, super-recognition has been defined and tested using almost exclusively “own-race” face memory and matching tests. Here, across three studies, we test Caucasian participants' performance on own- and other-race face identification tasks (GFMT, MFMT, CFMT+, EFMT, CFMT-Chinese). Our findings show that compared to controls, high-performing typical recognisers (Studies 1 and 2) and SRs (Study 3) show superior performance on both the own- and other-race tests. These findings suggest that recruiting SRs in ethnically diverse applied settings could be advantageous.     

The Effect of Feedback on Face‐Matching Accuracy

In face matching, observers have to decide if two photographs depict the same person or different people. This is a remarkably difficult task, so the current study investigated whether it can be improved when observers receive feedback for their performance. In five experiments, observers' initial matching performance was recorded before feedback for their accuracy was administered across three blocks. Improvements were then assessed with faces that had been seen previously with or without feedback and with completely new, previously unseen faces. In all experiments, feedback failed to improve face‐matching accuracy. However, trial‐by‐trial feedback helped to maintain accuracy at baseline level after feedback was withdrawn again, even with new faces (Experiments 1–3). By contrast, when no feedback was given throughout the experiment (Experiments 1–3) or when outcome feedback was administered at the end of blocks (Experiments 4 and 5), a continuous decline in matching accuracy was found, whereby observers found it increasingly difficult to tell different facial identities apart. A sixth experiment showed that this decline in accuracy continues throughout when the matching task is prolonged substantially. Together, these findings indicate that observers find it increasingly difficult to differentiate faces in matching tasks over time, but trial‐by‐trial feedback can help to maintain accuracy. The theoretical and practical implications of these findings are discussed. Copyright © 2013 John Wiley & Sons, Ltd.     

Matching Face Images Taken on the Same Day or Months Apart: the Limitations of Photo ID

It is well‐established that matching images of unfamiliar faces is rather error prone. However, there is an important mismatch between face matching in laboratory and realistic settings. All of the currently available face‐matching databases were designed to establish the baseline level of unfamiliar face perception. Therefore, target and test images for each face identity have been taken on the same day, minimizing within‐face variations. In realistic settings, on the other hand, faces do vary, even day to day. This study examined the proficiency of matching images of unfamiliar faces, which were taken on the same day or months apart. In two experiments, same‐day images were matched substantially more accurately and faster than different‐date photographs using the standard 1‐in‐10 and pairwise face‐matching tasks. This suggests that experimental studies on face matching underestimate its difficulty in real‐world situations. Photographs of unfamiliar faces seem to be unreliable proofs of identity, especially if the ID documents do not use very recent images of the holders. Copyright © 2013 John Wiley & Sons, Ltd.     

A matching advantage for dynamic human faces

In a series of three experiments, we used a sequential matching task to explore the impact of non-rigid facial motion on the perception of human faces. Dynamic prime images, in the form of short video sequences, facilitated matching responses relative to a single static prime image. This advantage was observed whenever the prime and target showed the same face but an identity match was required across expression (experiment 1) or view (experiment 2). No facilitation was observed for identical dynamic prime sequences when the matching dimension was shifted from identity to expression (experiment 3). We suggest that the observed dynamic advantage, the first reported for non-degraded facial images, arises because the matching task places more emphasis on visual working memory than typical face recognition tasks. More specifically, we believe that representational mechanisms optimised for the processing of motion and/or change-over-time are established and maintained in working memory and that such 'dynamic representations' (Freyd, 1987 Psychological Review 94 427-438) capitalise on the increased information content of the dynamic primes to enhance performance.     

When preschoolers follow their eyes and older children follow their noses: visuo‐olfactory social affective matching in childhood

Recognition of emotional facial expressions is a crucial skill for adaptive behavior that most often occurs in a multi‐sensory context. Affective matching tasks have been used across development to investigate how people integrate facial information with other senses. Given the relative affective strength of olfaction and its relevance in mediating social information since birth, we assessed olfactory–visual matching abilities in a group of 140 children between the ages of 3 and 11 years old. We presented one of three odor primes (rose, fish and no‐odor, rated as pleasant or unpleasant by individual children) before a facial choice task (happy vs. disgusted face). Children were instructed to select one of two faces. As expected, children of all ages tended to choose happy faces. Children younger than 5 years of age were biased towards choosing the happy face, irrespective of the odor smelled. After age 5, an affective matching strategy guided children's choices. Smelling a pleasant odor predicted the choice of happy faces, whereas smelling the unpleasant or fish odor predicted the choice of disgusted faces. The present study fills a gap in the developmental literature on olfactory‐visual affective strategies that affect decision‐making, and represents an important step towards understanding the underlying developmental processes that shape the typical social mind.     

Attention to internal face features in unfamiliar face matching

Accurate matching of unfamiliar faces is vital in security and forensic applications, yet previous research has suggested that humans often perform poorly when matching unfamiliar faces. Hairstyle and facial hair can strongly influence unfamiliar face matching but are potentially unreliable cues. This study investigated whether increased attention to the more stable internal face features of eyes, nose, and mouth was associated with more accurate face‐matching performance. Forty‐three first‐year psychology students decided whether two simultaneously presented faces were of the same person or not. The faces were displayed for either 2 or 6 seconds, and had either similar or dissimilar hairstyles. The level of attention to internal features was measured by the proportion of fixation time spent on the internal face features and the sensitivity of discrimination to changes in external feature similarity. Increased attention to internal features was associated with increased discrimination in the 2‐second display‐time condition, but no significant relationship was found in the 6‐second condition. Individual differences in eye‐movements were highly stable across the experimental conditions.     

In the Dock: Chimeric Image Composites Reduce Identification Accuracy

The aim of presenting chimeric images (formed from opposing halves of a pair of same or different faces) in court settings is to optimise the accuracy of identification decisions based on CCTV evidence. The experiments reported here examined the utility of this technique. Experiment 1 examined the accuracy of face matching with vertically split, aligned chimeric images, misaligned hemi‐faces and full‐face images. Experiment 2 replicated the first experiment but replaced the misaligned images with opposing hemi‐faces separated by a gap. The final experiment used horizontally split faces. All three experiments showed that matching was less accurate with aligned chimeric images than with full‐face images. Furthermore, the pattern of responses obtained with chimeric images differed significantly from full‐face matching and misaligned/separated hemi‐face matching. Chimeric images produced a bias towards same responses even when the face halves were different. The results suggest caution in the use of chimeric images in court. Copyright © 2011 John Wiley & Sons, Ltd.     

The allure of status: high-status targets are privileged in face processing and memory

The current research tests the hypothesis that face processing is attuned to high-status faces. Across three experiments, faces of high-status targets were better recognized than faces of low-status targets. In Experiment 2, this memory advantage for high-status targets also extended to an attentional bias toward high-status targets and to stronger sociospatial memory (identity-location link) for high-status targets. Finally, Experiment 3 finds that high-status faces received more expert-style holistic processing than did low-status faces. This suggests that high-status faces also benefit more from the strategic deployment of expert face processing resources than low-status faces. Taken together, these data indicate that perceivers strategically allocate face processing resources to targets perceived to be high in status.     

A developmental investigation of other‐race contact and the own‐race face effect

Research over the past two decades has demonstrated that individuals are better at recognizing and discriminating faces of their own race versus other races. The own‐race effect has typically been investigated in relation to recognition memory; however, some evidence supports an own‐race effect at the level of perceptual encoding in adults. The current study investigated the developmental basis of the own‐race effect in White primary students (aged 7–11), secondary students (aged 12–15) and university students. Face stimuli were generated by morphing South Asian and White parent faces together along a linear continuum. In a same/different perceptual discrimination task, participants judged whether the face stimuli (morphs and parent faces) were physically identical to or different from the original parent faces. Results revealed a significant race of face effect for each age group, whereby participants were better at discriminating White relative to Asian faces. A significantly larger own‐race effect was observed for the secondary and university students than for primary students. A questionnaire was used to assess other‐race social anxiety and contact; however, this self‐report measure was not found to be related to the observed own‐race effect.     

More Inaccurate But Not More Biased: Anxiety During Encoding Impairs Face Recognition Accuracy But Does Not Moderate the Own‐Ethnicity Bias

Heightened state anxiety can have a deleterious impact on memory for faces. In this paper we investigated whether anxiety: (i) moderates the own‐ethnicity bias (OEB) and (ii) impairs face recognition accuracy at the encoding or retrieval phase of an OEB face‐recognition task. Using a typical OEB task, anxiety was induced during encoding and retrieval in Experiment 1, but only during retrieval in Experiment 2. An OEB was found in both experiments, but anxiety did not moderate the OEB in either experiment. In Experiment 1, anxious participants were poorer at face recognition for both own‐ and other‐ethnicity faces. In Experiment 2 anxiety did not impair face recognition. Together, these studies suggest that anxiety impaired participants' encoding, but not retrieval, of faces. The implications of these findings are discussed. Copyright © 2015 John Wiley & Sons, Ltd.     

Facial identity and facial expression matching in 5–12‐year‐old children and adults

Facial identity and facial expression matching tasks were completed by 5–12‐year‐old children and adults using stimuli extracted from the same set of normalized faces. Configural and feature processing were examined using speed and accuracy of responding and facial feature selection, respectively. Facial identity matching was slower than face expression matching for all age groups. Large age effects were found on both speed and accuracy of responding and feature use in both identity and expression matching tasks. Eye region preference was found on the facial identity task and mouth region preference on the facial expression task. Use of mouth region information for facial expression matching increased with age, whereas use of eye region information for facial identity matching peaked early. The feature use information suggests that the specific use of primary facial features to arrive at identity and emotion matching judgments matures across middle childhood. Copyright © 2009 John Wiley & Sons, Ltd.     

Face processing and familiarity: Evidence from eye‐movement data

How is information extracted from familiar and unfamiliar faces? Three experiments, in which eye‐movement measures were used, examined whether there was differential sampling of the internal face region according to familiarity. Experiment 1 used a face familiarity task and found that whilst the majority of fixations fell within the internal region, there were no differences in the sampling of this region according to familiarity. Experiment 2 replicated these findings, using a standard recognition memory paradigm. The third experiment employed a matching task, and once again found that the majority of fixations fell within the internal region. Additionally, this experiment found that there was more sampling of the internal region when faces were familiar compared with when they were unfamiliar. The use of eye fixation measures affirms the importance of internal facial features in the recognition of familiar faces compared with unfamiliar faces, but only when viewers compare pairs of faces.     

Breaking face processing tasks apart to improve their predictive value in the real world: A comment on Ramon,Bobak, and White (2019)

In this commentary, I will expand on three aspects suggested by Ramon et al. (2019, British Journal of Psychology, 110, 461) to improve the predictive value of laboratory‐based tasks in real‐world applications. There are potential benefits that may arise from three interrelated considerations, particularly in terms of predicting agents’ susceptibility to errors in operational settings. The first is a proposal to conduct a detailed examination of performance on face processing tests rather than only analysing overall accuracy scores. The second involves considering non‐face‐related cognitive and meta‐cognitive sub‐processes involved in face processing tasks. The third highlights the contribution of superior recognisers in creating challenging tests that simulate difficult real‐world situations.     

The Effect of Image Pixelation on Unfamiliar‐Face Matching

Low‐resolution, pixelated images from closed‐circuit television (CCTV) can be used to compare the perpetrators of crime with high‐resolution photographs of potential suspects. The current study investigated the accuracy of person identification under these conditions, by comparing high‐resolution and pixelated photographs of unfamiliar faces in a series of matching tasks. Performance decreased gradually with different levels of pixelation and was close to chance with a horizontal image resolution of only 8 pixels per face (Experiment 1). Matching accuracy could be improved by reducing the size of pixelated faces (Experiment 2) or by varying the size of the to‐be‐compared‐with high‐resolution face image (Experiment 3). In addition, pixelation produced effects that appear to be separable from other factors that might affect matching performance, such as changes in face view (Experiment 4). These findings reaffirm that criminal identifications from CCTV must be treated with caution and provide some basic estimates for identification accuracy with different pixelation levels. This study also highlights potential methods for improving performance in this task. Copyright © 2013 John Wiley & Sons, Ltd.     

Domain‐specific development of face memory but not face perception

How does the remarkable human ability for face recognition arise over development? Competing theories have proposed either late maturity (beyond 10 years) or early maturity (before 5 years), but have not distinguished between perceptual and memory aspects of face recognition. Here, we demonstrate a perception–memory dissociation. We compare rate of development for (adult, human) faces versus other social stimuli (bodies), other discrete objects (cars), and other categories processed in discrete brain regions (scenes, bodies), from 5 years to adulthood. For perceptual discrimination, performance improved with age at the same rate for faces and all other categories, indicating no domain‐specific development. In contrast, face memory increased more strongly than non‐face memory, indicating domain‐specific development. The results imply that each theory is partly true: the late maturity theory holds for face memory, and the early maturity theory for face perception.     

Monitoring and Control of Learning Own‐Race and Other‐Race Faces

The own‐race bias refers to the finding that individuals are better able to recognize faces of the same race or ethnicity compared with faces of another race or ethnicity. The current study examined whether the own‐race bias was also evident in participants' predictions of memory performance and their self‐regulation of learning. In three experiments, participants studied own‐race and other‐race faces and predicted the likelihood of recognizing each face on a future test. Experiment 1 showed that participants provided similar predictions for own‐race and other‐race faces, despite superior recognition of own‐race faces. Experiments 2 and 3 permitted participants to control their study of faces and revealed better self‐regulation of learning for own‐race relative to other‐race faces. Collectively, these experiments suggest that the own‐race bias may partially reflect a metacognitive deficiency, as participants are less able to effectively self‐regulate learning for other‐race faces. The implications of these findings are discussed. Copyright © 2013 John Wiley & Sons, Ltd.     

Contact and other‐race effects in configural and component processing of faces

Other‐race faces are generally recognized more poorly than own‐race faces. There has been a long‐standing interest in the extent to which differences in contact contribute to this other‐race effect (ORE). Here, we examined the effect of contact on two distinct aspects of face memory, memory for configuration and for components, both of which are better for own‐race than other‐race faces. Configural and component memory were measured using recognition memory tests with intact study faces and blurred (isolates memory for configuration) and scrambled (isolates memory for components) test faces, respectively. Our participants were a large group of ethnically Chinese individuals who had resided in Australia for varying lengths of time, from a few weeks to 26 years. We found that time in a Western country significantly (negatively) predicted the size of the ORE for configural, but not component, memory. There was also a trend for earlier age of arrival to predict smaller OREs in configural, but not component, memory. These results suggest that memory for configural information in other‐race faces improves with experience with such faces. However, as found for recognition memory generally, the contact effects were small, indicating that other factors must play a substantial role in cross‐race differences in face memory.