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In the social neuroscience of face processing, multiple roles are attributed to amygdala: signalling of fear/threat-stimuli, of emotional expression, and general salience. The current study aimed at a direct comparison of amygdala activation attributable to these conditions by contrasting amygdala responses to matched emotional (threatening and non-threatening) and of non-emotional salient faces in a visual search paradigm using cartoon faces. Participants (21 healthy volunteers) had to detect a target face (angry, happy, blue, red, differing in the exact same features) in an array of closely matched non-target faces. Behavioural results revealed a pop-out effect for all targets compared to non-targets, indicating that they were all salient, independently of being emotional or non-emotional. While significant amygdala activation was obtained for all trials with salient faces (compared to those containing only non-target faces), no significant differences in activation emerged between emotional threatening, emotional non-threatening, and non-emotional targets. Moreover, right and left amygdala activation for target trials was found correlated to the behavioural measure of target detection. These findings provide evidence for a general role of the amygdala in signalling salience in a visual search independent of modality. Given the critical involvement of the amygdala in several neuropsychiatric disorders, the current findings may contribute to further our understanding on dysfunctional neural circuits in these disorders., (Copyright © 2010 Elsevier Inc. All rights reserved.)

The detection of social threat is crucial for adaptive behaviour. Previous studies have shown that angry faces capture attention and are processed more efficiently than happy faces. While this anger superiority effect has been found in typical and atypical development, it is unknown whether it exists in individuals with Williams syndrome (WS), who show reduced social fear and atypical sociability. In this study, children with WS searched for angry or happy target faces surrounded by 2, 5 or 8 distracters (happy or angry faces, respectively). Performance was compared to that of mental age-matched controls. Results revealed no group differences for happy faces, however for angry faces, the WS, but not the control group, showed a significant performance decrease for the 8-distracters condition, indicating the absence of an anger superiority effect, in good agreement with evidence for abnormal structure and function in brain areas for social threat processing in WS., (Copyright (c) 2009 Elsevier Ltd. All rights reserved.)

In the current study, typically developing children and children with autism spectrum disorders (ASD) were presented with a facial-feature discrimination task including both real and cartoon faces, displayed either upright or inverted. Results demonstrated that typically developing children were more accurate at discriminating facial features from upright than from inverted faces and that this effect was specific to real faces. By contrast, children with ASD failed to show such a specific pattern of performance for processing facial features displayed in real faces. Findings of the current study suggest that face type (real vs. cartoon) does not affect perceptual ability in children with ASD as it does in typically developing children.

Increased motivation towards social stimuli in Williams syndrome (WS) led us to hypothesize that a face's human status would have greater impact than face's orientation on WS' face processing abilities. Twenty-nine individuals with WS were asked to categorize facial emotion expressions in real, human cartoon and non-human cartoon faces presented upright and inverted. When compared to both chronological and mental age-matched controls, WS participants were able to categorize emotions from human, but not from non-human faces. The use of different perceptual strategies to process human and non-human faces could not explain this dissociation. Rather, the findings suggest an increased sensitivity to socially relevant cues, such as human facial features, possibly related to the hallmark feature of WS-hypersociability.

Several studies suggest that children with ADHD tend to perform worse than typically developing children on emotion recognition tasks. However, most of these studies have focused on the recognition of facial expression, while there is evidence that context plays a major role on emotion perception. This study aims at further investigating emotion processing in children with ADHD, by assessing not only facial emotion recognition (Experiment 1) but also emotion recognition on the basis of contextual cues (Experiment 2). Twenty-seven children and adolescents with ADHD were compared to age-matched typically developing controls. Importantly, findings of this study show that emotion-processing difficulties in children with ADHD extend beyond facial emotion and also affect the recognition of emotions on the basis of contextual information. Our data thus indicate that children with ADHD have an overall emotion-processing deficit.

The aim of the present study was to determine whether individuals with Williams syndrome (WS) are able to recognize facial expressions of emotion and objects missing on the basis of contextual cues. Sixteen individuals with WS were compared to typically developing individuals matched on chronological and mental age. WS group performed significantly lower than both control groups in object recognition. By contrast, no such group differences were found in facial expression recognition, suggesting that individuals with WS do have the ability to process contextual cues. However, this ability seems to be boosted when they are to process socially relevant cues.

This study compared the influence of categorization on perceptual processing in adults with autistic spectrum disorders (ASD) and normal control participants. Participants were asked to categorize hybrid faces (composed of two overlapped faces of different spatial bandwidths) by gender and emotion. Control participants exhibited a bias for low-pass information during gender categorization and a bias for high-pass information during emotion categorization. By contrast, adults with ASD showed the same low-pass bias in both tasks. This absence of a shift in processing style in the ASD group is discussed in terms of diminished top-down modulation in autism.

Abstract: Children with Williams syndrome (WS) show an uneven cognitive profile with relatively spared face-processing skills contrasting with impaired visuospatial cognition. More precisely, deficits to process spatial relationships between elements of a visual pattern (that is, configural processing) have been found in children with WS. The present study aimed at determining whether this configural-processing deficit affects facial-emotion recognition. To this aim, 15 children with WS were asked to recognize emotional expressions displayed in upright and inverted faces and their performance was compared to that of 15 mental and 15 chronological age-matched controls. Results revealed that children with WS, as typically developing controls, were more accurate to recognize emotions displayed in upright than in inverted faces. This indicates that children with WS are able to use a typical perceptual strategy, that is., a configural strategy, to process facial expressions of emotion. Findings of this study are interpreted in relation to the hallmark feature of WS–hypersociability. [Copyright &y& Elsevier]

Abstract: The aim of the present study was to determine whether children with autism spectrum disorders (ASD) are able to recognize facial expressions of emotion and objects missing on the basis of contextual cues. While most of these studies focused on facial emotion recognition, here we examined the ability to extract emotional information on the basis contextual cues. Nineteen children and adolescents with ASD were asked to recognize emotions and objects (control condition) masked within visual scenes and their performance was compared to that of 19 typically developing controls matched on chronological age and gender. Results revealed that children with ASD were able to use contextual cues to recognize objects but not emotions. Findings of this study are discussed within the framework of specific emotional processing deficits in ASD. [Copyright &y& Elsevier]

This study evaluated whether atypical face processing in autism extends from human to cartoon faces for which they show a greater interest. Twenty children with autistic spectrum disorders (ASD) were compared to two groups of typically developing children, matched on chronological and mental age. They processed the emotional expressions of real faces, human cartoon and non-human cartoon faces. Children with ASD were as capable as controls in processing emotional expressions, but strategies differed according to the type of face. Controls relied on a configural strategy with all faces. By contrast, ASD children exploited this typical configural strategy with cartoons but used a local strategy with real faces. This atypical visual processing style is discussed in the context of face expertise. [ABSTRACT FROM AUTHOR]