Processing Of Negative Facial Expressions Research Articles

The relationship between early and recent life stress and emotional expression processing: A functional connectivity study

The aim of this study was to characterize neural activation during the processing of negative facial expressions in a non-clinical group of individuals characterized by two factors: the levels of stress experienced in early life and in adulthood. Two models of stress consequences were investigated: the match/mismatch and cumulative stress models. The match/mismatch model assumes that early adversities may promote optimal coping with similar events in the future through fostering the development of coping strategies. The cumulative stress model assumes that effects of stress are additive, regardless of the timing of the stressors. Previous studies suggested that stress can have both cumulative and match/mismatch effects on brain structure and functioning and, consequently, we hypothesized that effects on brain circuitry would be found for both models. We anticipated effects on the neural circuitry of structures engaged in face perception and emotional processing. Hence, the amygdala, fusiform face area, occipital face area, and posterior superior temporal sulcus were selected as seeds for seed-based functional connectivity analyses. The interaction between early and recent stress was related to alterations during the processing of emotional expressions mainly in to the cerebellum, middle temporal gyrus, and supramarginal gyrus. For cumulative stress levels, such alterations were observed in functional connectivity to the middle temporal gyrus, lateral occipital cortex, precuneus, precentral and postcentral gyri, anterior and posterior cingulate gyri, and Heschl’s gyrus. This study adds to the growing body of literature suggesting that both the cumulative and the match/mismatch hypotheses are useful in explaining the effects of stress.

Neural Temporal Dynamics of Facial Emotion Processing: Age Effects and Relationship to Cognitive Function.

This study used event-related potentials (ERPs) to investigate the effects of age on neural temporal dynamics of processing task-relevant facial expressions and their relationship to cognitive functions. Negative (sad, afraid, angry, and disgusted), positive (happy), and neutral faces were presented to 30 older and 31 young participants who performed a facial emotion categorization task. Behavioral and ERP indices of facial emotion processing were analyzed. An enhanced N170 for negative faces, in addition to intact right-hemispheric N170 for positive faces, was observed in older adults relative to their younger counterparts. Moreover, older adults demonstrated an attenuated within-group N170 laterality effect for neutral faces, while younger adults showed the opposite pattern. Furthermore, older adults exhibited sustained temporo-occipital negativity deflection over the time range of 200–500 ms post-stimulus, while young adults showed posterior positivity and subsequent emotion-specific frontal negativity deflections. In older adults, decreased accuracy for labeling negative faces was positively correlated with Montreal Cognitive Assessment Scores, and accuracy for labeling neutral faces was negatively correlated with age. These findings suggest that older people may exert more effort in structural encoding for negative faces and there are different response patterns for the categorization of different facial emotions. Cognitive functioning may be related to facial emotion categorization deficits observed in older adults. This may not be attributable to positivity effects: it may represent a selective deficit for the processing of negative facial expressions in older adults.

Deficits in attentional processing of fearful facial expressions in schizophrenic patients.

Impaired attentional processing of negative facial expressions is prominent in schizophrenia and has been shown to be associated with patients’ social dysfunctions. However, little is known about when and which specific attention deficits influence social functions. Given the dynamic feature of attention, it is necessary to investigate the attention deficits in negative emotional processing unfolding in time. The current study used event-related potentials (ERPs) to investigate the temporal dynamics of attention deficits in emotion perception and their potential relationship with emotional/social impairments in neuroleptic naive schizophrenic patients. Two specific attention deficits were identified and were found to be associated with emotional/social impairments. More specifically, the deficit in orienting attention (evidenced with the reduced P1 amplitude) was correlated with expressive deficits, while the deficit in executive control of attention (evidenced with the reduced P3 amplitude) was correlated with avolition/asociality. Together, these findings may provide novel insights into the core pathophysiological processes and offer objective biomarkers for specific emotional/social impairments in schizophrenia. It is also hoped that this study helps to bridge the gap between basic cognitive deficits and relative high-level social dysfunctions in schizophrenic patients.

The role of the cannabinoid receptor in adolescents′ processing of facial expressions

The processing of emotional faces is an important prerequisite for adequate social interactions in daily life, and might thus specifically be altered in adolescence, a period marked by significant changes in social emotional processing. Previous research has shown that the cannabinoid receptor CB1R is associated with longer gaze duration and increased brain responses in the striatum to happy faces in adults, yet, for adolescents, it is not clear whether an association between CBR1 and face processing exists. In the present study we investigated genetic effects of the two CB1R polymorphisms, rs1049353 and rs806377, on the processing of emotional faces in healthy adolescents. They participated in functional magnetic resonance imaging during a Faces Task, watching blocks of video clips with angry and neutral facial expressions, and completed a Morphed Faces Task in the laboratory where they looked at different facial expressions that switched from anger to fear or sadness or from happiness to fear or sadness, and labelled them according to these four emotional expressions. A-allele versus GG-carriers in rs1049353 displayed earlier recognition of facial expressions changing from anger to sadness or fear, but not for expressions changing from happiness to sadness or fear, and higher brain responses to angry, but not neutral, faces in the amygdala and insula. For rs806377 no significant effects emerged. This suggests that rs1049353 is involved in the processing of negative facial expressions with relation to anger in adolescence. These findings add to our understanding of social emotion-related mechanisms in this life period.

Perceptual Sensitivity and Response Bias in Social Anxiety: An Application of Signal Detection Theory

Social anxiety is associated with tendencies to perceive other people’s facial expressions in a negative manner. Two independent factors, sensitivity to and response criteria for emotional faces, may contribute to this bias. By applying signal detection theory and employing morphed facial stimuli with equated levels of intensity, we examined sensitivity to and response criteria for faces that were subtly angry or happy with a sample of 88 college students. Higher levels of social anxiety were associated with both greater sensitivity to mild anger and tendencies to label facial expressions as angry. In contrast, levels of social anxiety were not significantly associated with either sensitivity to or response criteria for mildly happy faces. These results indicate that the processing of negative facial expressions in social anxiety is affected by both greater sensitivity to the detection of threats and a bias for judging ambiguous social cues as threatening.

Inter-hemispherical functional coupling of EEG rhythms during the perception of facial emotional expressions

ObjectiveBrain rhythms of both hemispheres are involved in the processing of emotional stimuli but their interdependence between the two hemispheres is poorly known. Here we tested the hypothesis that passive visual perception of facial emotional expressions is related to a coordination of the two hemispheres as revealed by the inter-hemispherical functional coupling of brain electroencephalographic (EEG) rhythms. MethodsTo this aim, EEG data were recorded in 14 subjects observing emotional faces with neutral, happy or sad facial expressions (about 33% for each class). The EEG data were analyzed by directed transfer function (DTF), which estimates directional functional coupling of EEG rhythms. The EEG rhythms of interest were theta (about 4–6Hz), alpha 1 (about 6–8Hz), alpha 2 (about 8–10Hz), alpha 3 (about 10–12Hz), beta 1 (13–20Hz), beta 2 (21–30Hz), and gamma (31–44Hz). ResultsIn the frontal regions, inter-hemispherical DTF values were bidirectionally higher in amplitude across all frequency bands, during the perception of faces with sad compared to neutral or happy expressions. ConclusionsThese results suggest that the processing of emotional negative facial expressions is related to an enhancement of a reciprocal inter-hemispherical flux of information in frontal cortex, possibly optimizing executive functions and motor control. SignificanceDichotomical view of hemispherical functional specializations does not take into account remarkable reciprocal interactions between frontal areas of the two hemispheres during the processing of negative facial expressions.

A Fake Smile Thwarts Cheater Detection

People can discriminate cheaters from cooperators on the basis of negative facial expressions. However, such cheater detection is far from perfect in real-world situations. Therefore, it is possible that cheaters have the ability to disguise negative emotional expressions that signal their uncooperative attitude. To test this possibility, emotional intensity and trustworthiness were evaluated for facial photographs of cheaters and cooperators defined by scores in an economic game. The facial photographs had either posed happy or angry expressions. The angry expressions of cheaters were rated angrier and less trustworthy than those of cooperators. On the other hand, happy expressions of cheaters were higher in emotional intensity but comparable to those of cooperators in trustworthiness. These results suggest that cheater detection based on the processing of negative facial expressions can be thwarted by a posed or fake smile, which cheaters put on with higher intensity than cooperators.

A Neutral Face Is Not Neutral Even if You Have Not Seen It: Social Anxiety Disorder and Affective Priming with Facial Expressions

Cognitive theories suggest that social anxiety disorder (SAD) is characterized by biased processing of negative facial expressions. Recently, however, it has been proposed that the fear of positive evaluation may play an additional, important role. In order to investigate which specific expressions evoke biased processing, 15 patients diagnosed with SAD and 15 non-anxious controls (NACs) completed an affective priming procedure: they rated neutral symbols which were preceded by sub-optimally presented primes of angry, neutral, and smiling faces. Patients with SAD rated the symbols significantly more negatively than NACs when they were primed with a neutral face. In addition, SAD patients tended to rate all symbols significantly more negatively suggesting that all faces (negative, positive, and neutral) are threatening to SAD patients.

Interference control during recognition of facial affect enhances the processing of expression specific properties — An event-related fMRI study

Though we can almost pre-attentively categorize the valence of facial expressions, we experience emotional ambiguity when confronted with facial expressions in a context with incongruent emotional information. We simultaneously presented interfering background colors during forced-choice categorizations of negative (fear), neutral and positive (happy) expressions. Conflicting information induced strong and differential interference effects on a behavioral level which was mirrored in comparable activations on a neuronal level. Besides a common fronto-parietal attention network which was activated during interference resolution, we found differential interference effects for facial expressions. Incongruent trials with neutral expressions induced a distinct activation pattern in ventral visual regions particularly involved in deeper analysis for both the task-relevant facial expressions (fusiform (FFA) and occipital face area (OFA)) and the task-irrelevant color (V4). Compared to neutral expressions, incongruent trials including either negative or positive expressions elicited attenuated interference effects. Unlike incongruent trials with positive facial expressions which showed only sparse activation in frontal cortex, interference resolution during processing of negative facial expressions resulted in specific activations in regions (V3a, MT +, STS) which might be involved in processing of implicit dynamics of negative expressions. Thus, functional activations in visual processing regions might specifically be related to processing demands of different expressions.

Processing of a simple aversive conditioned stimulus in a divided visual field paradigm: an fMRI study

A left visual hemifield advantage for the processing of negative facial expressions has been demonstrated in a variety of studies. We tested whether the same effect is found for a neutral facial expression that had acquired a negative meaning through pairing with an aversive event. Startle reflex amplitudes, skin-conductance responses (SCR), and two verbal measures of affect (negative valence and arousal) were significantly increased after pairing, but no stimulation side by pairing interaction was observed. Functional magnetic resonance imaging (fMRI) revealed a significant increase of BOLD (blood oxygen level dependent) activity in the medial prefrontal cortex (MPFC), and the right frontal opercular region (RFOP). MPFC activity was correlated with psychophysiological and verbal emotional responses across subjects and, like these responses, was independent of the stimulation side. In contrast, RFOP activity was significantly stronger during left than during right hemifield stimulation but did not correlate with psychophysiological or verbal measures of negative affect. These results suggest that emotional responses to an aversive conditioned expressively neutral face are similar in both visual hemifields. MPFC activity seems to be closely linked to the strength of these responses.