Out of Context, Beyond the Face: Neuroanatomical Pathways of Emotional Face-Body Language Integration in Adolescent Offenders
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Added: February 26, 2019
Out of Context, Beyond the Face: Neuroanatomical Pathways of Emotional Face-Body Language Integration in Adolescent Offenders
The term “adolescent offenders” (AOs) refers to subjects below 18 years of age who disrupt social and legal regulations and manifest delinquent behavior, ranging from minor offenses (such as underage smoking/drinking) to property crimes and violent crimes (Dodge et al., 1990; Philipp-Wiegmann et al., 2017). These individuals usually transgress social norms and exhibit antisocial and aggressive conduct (Gonzalez-Gadea et al., 2014; Piotrowska et al., 2015; Piquero et al., 2015). This pattern of disruptive behaviors can be understood as a general maladjustment to the immediate social context. For instance, disorderly conduct in AOs is associated to reduced abilities in different socio-cognitive functions, crucially including emotion recognition (Fairchild et al., 2009; Sato et al., 2009). This domain, which proves vital predicting social behavior (Frith, 2009; Ibáñez et al., 2014), entails highly context-dependent dynamic processes (Frith, 2009) that are sensitive to surrounding visual scenes (Barrett et al., 2011), verbal cues (Hassin et al., 2013), bodily signals (Aviezer et al., 2012), and other faces (Oosterhof and Todorov, 2008). Although AOs have been shown to exhibit difficulties in this domain (Fairchild et al., 2009; Sato et al., 2009), most studies have employed isolated stimuli indexing recognition of decontextualized emotions, thus proving blind to how the phenomenon operates under more ecological circumstances. To bridge this gap, here we evaluated how contextual information (i.e., body language) modulates facial emotion recognition in AOs, also assessing neuroanatomical markers of this process.
Adolescence is considered a critical period for developing socio-cognitive and affective processes in response to social-context requirements (Burnett et al., 2011). Many of those processes appear to be affected in AOs, who exhibit abnormal performance in empathy (Gonzalez-Gadea et al., 2014), moral judgment (Stams et al., 2006), and social decision-making (van den Bos et al., 2014) tasks, alongside different types of dysfunctional and delinquent behaviors (Hubble et al., 2015; Piquero et al., 2015).
Critically, socio-cognitive and behavioral problems in AOs have also been associated to facial emotion recognition difficulties (Fairchild et al., 2008, 2009; Passamonti et al., 2010). In the same vein, adolescents with conduct disorders manifest impairments on behavioral and psychophysiological measures of emotional recognition function, including facial expression recognition (Fairchild et al., 2009) and fear conditioning (Fairchild et al., 2008). In addition, compared to controls, AOs exhibit increased amygdala activation in presence of faces with negative valence (Passamonti et al., 2010).
Two contrastive theories have linked aggression to emotion recognition in AOs. On the one hand, aggressive behaviors may reflect increased sensitivity towards hostile signals (e.g., stimuli conveying disgust or anger), leading to defensive and maladaptive behaviors (Dodge et al., 1990; Jusyte and Schonenberg, 2017). This hostile misattribution bias in adult samples has been associated to reactive behaviors, including neural modulations in action preparation areas and physiological reactions related to stress (de Gelder et al., 2004; Grèzes et al., 2007; Fairchild et al., 2008, 2009). One the other hand, a reduced ability in recognizing social signals of distress (for instance the recognition of sad or fear emotions in others) may also be associated to disruptive behaviors observed in AOs (Blair et al., 2001; Bowen et al., 2014). Arguably, a decreased ability in negative emotions lead to offenders to ignore alarm or suffering cues in others and it could increase a non-prososcial behavior (Blair et al., 2001). The evidence suggests that both factors may be operative in the distinctive pattern observed in AOs.
Facial emotion recognition rests on the implicit integration of interoceptive signals and features external to facial expressions proper, including body language (de Gelder et al., 2004; Aviezer et al., 2012), voices (de Gelder et al., 1999; Davies-Thompson et al., 2018), verbal descriptions (Ferrari et al., 2016), visual scenes (Van den Stock et al., 2014; Wieser and Keil, 2014), and other forms of contextual information (Aviezer et al., 2012; Hassin et al., 2013; Couto et al., 2015; Adolfi et al., 2016). The perception of body signals and the surrounding context is highly relevant for unveiling emotional integration (de Gelder, 2006), with bodily cues affecting emotion recognition more than faces that express intense emotions (Aviezer et al., 2012).
The implicit integration of emotional information involves the activity of different brain networks, including: (a) areas of the visual network, such as the primary visual cortex (V1), the lateral geniculate nucleus, and the superior colliculus (de Gelder, 2006; Tamietto and de Gelder, 2010; Bachmann et al., 2018); (b) regions subserving action observation and motion perception, such as the premotor cortices, the inferior frontal gyrus, the inferior parietal lobe, the extrastriate body area, the fusiform body area, and the superior temporal sulcus (de Gelder, 2006; Tamietto and de Gelder, 2010; Burra et al., 2017); (c) areas involved in perceiving social information, like the temporo-parietal junction, the medial prefrontal cortex, the precuneus, and the orbitofrontal cortex (de Gelder, 2006; Tamietto and de Gelder, 2010; Bachmann et al., 2018); and (d) regions implicated in emotional processing, including the orbitofrontal cortex, the anterior cingulate cortex (CC), the precuneus, the amygdala, hypothalamus, the basal ganglia, and the periaqueductal gray (Grèzes et al., 2007; Vytal and Hamann, 2010; Van den Stock et al., 2014; Diano et al., 2017; Bachmann et al., 2018).
By the same token, the integration of emotional and social information from different sources (e.g., conveyed through direct or indirect gazes in a social context) may rely on dissociable cellular and physiological substrates. In particular, congruent social signals (e.g., a direct gaze in a social context) are mainly integrated by magnocellular channels tuned to low spatial frequencies, whereas incongruent signals (e.g., indirect eye gaze in a social context) are more integrated in parvocellular channels and high spatial frequencies. Note, however, that low spatial frequency emotional signals are also processed non-consciously (Burra et al., 2017).
Despite its cross-dimensional nature, emotion recognition in AOs has been mainly studied through decontextualized photographs of isolated facial expressions (Fairchild et al., 2008, 2009; Passamonti et al., 2010) –for an exception, see the study by Gonzalez-Gadea et al. (2014), although no body language or neural markers were assessed. Importantly, since such atomistic tasks can be solved via explicit knowledge, they seem insufficient for capturing emotion processing as manifested in daily life (Aviezer et al., 2012; Gonzalez-Gadea et al., 2014).
To date, only a few studies have explored face-body integration processes, targeting only adult offenders. Most of these works have reported impaired facial emotion recognition and attentional biases towards angry body postures (Kret and de Gelder, 2013; Kuin et al., 2017). Violent offenders tend to exhibit a bias towards aggressive body language, including anger or disgust postures (Kret and de Gelder, 2013). Emotional recognition is also biased by specific types of violent behavior, with deficits in recognizing distressful cues (e.g., sadness or fear) proving more marked in reactive rather than proactive violent offenders (Philipp-Wiegmann et al., 2017).
Neurally speaking, performance in social and emotional tasks has been previously associated to the gray matter (GM) volume (Ashburner and Friston, 2000; Yue et al., 2016; Uono et al., 2017) and activity (Vytal and Hamann, 2010; Diano et al., 2017; Bachmann et al., 2018) of specific brain areas, including the ventral medial frontal cortices (implicated in the recognition of sadness), the inferior frontal gyrus (associated with anger and disgust), the superior temporal gyrus (STG; linked to recognition of happiness), the bilateral insula (a putative substrate of anger recognition and disgust), and the amygdala (putatively related to the recognition of fear; Vytal and Hamann, 2010; Diano et al., 2017; Bachmann et al., 2018).
Concerning the integration of contextual body signals in facial emotion perception, previous studies have shown an association with the GM volume of temporal areas—including the parahippocampus, the amygdala (Kumfor et al., 2018), and the fusiform gyrus (FG; Van den Stock et al., 2014; Kumfor et al., 2018)—as well as to regions implicated in the processing of emotional body language—i.e., the CC (Maier and di Pellegrino, 2012) and the precuneus (Ahmed et al., 2015). Also, emotion processing has been linked to motor-related regions, including the cerebellum (Kumfor et al., 2018; Poyo Solanas et al., 2018).
In addition, previous studies have shown that bodies convey not only emotional and social information, but also emotion-related action intentions (de Gelder et al., 2004, 2006; Van den Stock et al., 2014). A dissociable pattern of brain activation has been reported in response to emotional body postures. Particularly, happy bodily postures activate visual areas, including the middle occipital gyrus, the inferior temporal gyrus, and the intraparietal sulcus (Poyo Solanas et al., 2018). By contrast, the recognition of fearful body positions has been associated with activity in areas supporting emotional and social processing, like the posterior superior temporal sulcus, the ventral prefrontal cortex, and the amygdala (de Gelder et al., 2004; de Gelder, 2006; Vuilleumier and Driver, 2007). Also, recognition of fearful body postures has been related to motor resonance areas [e.g., supplementary motor area (SMA; Peelen et al., 2007)] and regions involved in the monitoring and representation of bodily states (i.e., insula; Karnath et al., 2005; Peelen and Downing, 2007; Peelen et al., 2007).
Against this background, and through a well-validated task (Aviezer et al., 2012; Kumfor et al., 2018), we aimed to investigate the integration of emotional information from faces and bodies with contextual information in a AOs compared to non-offenders (NOs). Our focus was on how contextual cues (i.e., emotional body language and surrounding context) influence facial emotion recognition in the former group. Additionally, we sought to establish key neuroanatomical correlates of such contextual integration.
We predicted that, compared to NOs, AOs would exhibit reduced ability to integrate bodily and facial emotional cues, alongside a major bias in perceiving the former. Considering that AOs exhibit difficulties in recognizing negative emotions (Blair et al., 2001; Bowen et al., 2014) and present a marked bias towards perceiving hostile scenarios (Kret and de Gelder, 2013), we hypothesized that they would be unable to properly recognize negative emotions while showing major sensitivity towards body signals that convey hostile positions (i.e., anger or disgust body positions). This bias should prove more salient in incongruent contexts, as those scenarios convey more conflicting body-face contextual information and require more robust integration mechanisms. We further surmised that these patterns would be related to levels of disorderly conduct (Bowen et al., 2014). Additionally, those difficulties should be related to the subjects’ executive functioning, considering that this domain is crucial for social adaptation in adolescents and represents a key determinant for the perception and integration of emotional cues (Escobar et al., 2014; Gonzalez-Gadea et al., 2014).
Furthermore, we predicted that contextual integration in AOs would be associated with GM volume in areas subserving context integration (i.e., temporal regions, body language areas; Ibañez and Manes, 2012; Baez and Ibanez, 2014; Baez et al., 2017a) and emotion recognition processes (frontal and cingulate regions and precuneus; Kumfor et al., 2018).
Materials and Methods
The study comprised 65 male participants, including 35 AOs and 30 NOs, matched for age (F(1,64) = 0.26, p = 0.21). However, AOs and NOs differed in education level (F(1,64) = 4.56, p < 0.05; see Table 1). AOs were recruited from a reform school for young male offenders in Barranquilla, Colombia. These subjects had been imprisoned for various reasons, including homicide attempt, homicide, theft, and illegal arm possession, among others (see Table 2). NOs were recruited from schools located in the same district of residence of AOs.
Table 1. Demographical and neuropsychological data comparison between offender adolescents (AOs) and non-offenders (NOs).
Recruitment was authorized and assisted by the schools’ principals and teachers. Inclusion criteria for control participants were: (a) gender (male); (b) age (between 15 and 18 years old); (c) education level (less than 12 years of education); and (d) absence of history of psychiatric or neurological disorders.
All participants completed a structured admission interview to rule out psychiatric disorders and ensure that they were not under pharmacological treatment during the assessment. All participants and parents/tutors provided written informed consent in agreement with the Helsinki declaration. The protocol was approved by the Ethics Committee of the Universidad Autónoma del Caribe.
Participants completed a battery of tasks tapping executive functions (EFs) and fluid intelligence (FI). The former were assessed via the INECO Frontal Screening (IFS) test (Torralva et al., 2009), a sensitive tool that has been used in different clinical and non-clinical populations (Baez et al., 2014, 2017b; Nunes et al., 2014), including AOs (Gonzalez-Gadea et al., 2014). The IFS comprises eight subtasks tapping on motor programming, conflicting instructions, verbal inhibitory control, abstraction ability (proverbs interpretation), backward digit span, spatial working memory, and a go/no-go test. A mean total score is calculated from the sum of the subtask scores (30 points). A 25-point cutoff score has shown a sensitivity of 96.2% and a specificity of 91.5% in detecting executive impairments (Torralva et al., 2009). Relative to NOs, AOs showed significantly lower IFS scores (F(1,64) = 8.0, p < 0.01). Comparisons for each subtask are reported in Table 1.
Fluid Intelligence Measure
FI was examined through Raven’s Standard Progressive Matrices (Raven, 1960). Following this procedure, participants completed a series of drawings by considering the spatial organization of an array of objects, identifying relevant features, and choosing one object that matched one or more of the identified features. In this study we used an adapted and validated local version of the battery (de Pedraza et al., 2012). No significant difference in FI was observed between groups (F(1,64) = 0.45, p = 0.51).
Levels of disorderly conduct in AOs were established by considering two independent indices: months of jail sentence [mean = 27.9 months; standard deviation (SD) = 2.2 months] and number of relapses (mean = 1.6 relapses; SD = 1.08) during the entire life of AOs. Types of delinquent behaviors in AOs are further described in Table 2. Participants in this group did not differ in terms EFs and education according to the type of offense (F(5,34) = 2.16, p = 0.75).
Emotion Recognition Task
Task A: Recognition of Context (Body Alone).
Participants viewed 40 pictures of bodies (with covered faces) belonging to four conditions (anger, disgust, fear, sadness), with 10 pictures per emotion. They were asked to point to the label that best described the emotion expressed through body language (“anger,” “disgust,” “fear,” “sadness”) and context information (some cues supporting body emotions, such as a knife accompanying a threatening body context).
Task B: Contextual Effects (Body and Face Assessment).
As in task A, participants were presented with pictures of male faces depicting four types of emotion (anger, disgust, fear, sadness) and pictures of male bodies depicting the same four types of emotions. Participants viewed 80 pictures of subjects in which a congruent (n = 40) or an incongruent (n = 40) context (i.e., emotional body language) accompanied the facial expression. Thus, the participants saw 10 congruent trials per emotion (face and body emotion coincided). Furthermore, the participants saw five incongruent trials for each incongruent face-body combination (e.g., face of anger with body of disgust, face of anger with body of fear, among other combinations). Participants were asked to point to the label that best matched the facial expression. Following previous procedures (Aviezer et al., 2012; Kumfor et al., 2018), performance was assessed via two indices: categorization accuracy and contextual influence. The former consisted in the mean of correctly labeled trials for both congruent and incongruent contexts. The latter was defined as the percentage of times the face was labeled as expressing the contextual emotion (e.g., when a disgust face in a fear context is labeled as expressing fear), as opposed to any other emotion. We calculated: (a) a measure for congruent context—identical to categorization accuracy for congruent trials; and (b) a measure for incongruent contexts—the degree to which contextual information (i.e., body language) affects facial emotion recognition.
For both tasks, images were randomized and presented one at a time with the emotional labels at the bottom of the screen, and they remained visible until a response was made. No time limit was set for responding and no feedback was provided (Figure 1).
Figure 1. Panel (A) shows the procedure of Task A. Panel (B) shows the procedure used in Task B, including a trial with a congruent item and a trial with an incongruent item. The stimuli of this procedure were adapted from Aviezer et al. (2008). Reproduced with permission from Aviezer et al. (2008). *Indicates attention fixation signal.
A subsample of 20 AOs and 19 NOs were scanned in a 1.5 T Siemens Magnetom equipped with a standard head coil following previous procedures (Lenroot and Giedd, 2010; Terribilli et al., 2011). The anatomical and 3D T1-weighted images had the following parameters: TR = 7.9, TE = 3.8, ACQ matrix 220 × 220 pixels, voxel size 0.5 × 0.5 × 0.5 mm, 310 sections.
All imaging analysis steps were conducted as described in the VBM pipeline, as follows. The T1-weighted images were normalized to the same stereotaxic space generated from the complete data set using the DARTEL algorithm, which significantly reduces the imprecision of inter-subject recordings. The images were then segmented into white matter, and GM, and non-brain voxels (cerebrospinal fluid). Subsequently, all images were modulated to correct volume changes by Jacobian determinants. Finally, images were smoothed by convolution with an isotropic 8-mm full-width Gaussian kernel at half maximum for statistical analyses.
Demographic and cognitive assessment data were compared between groups through ANOVAs, while categorical variables were assessed via chi-square tests.
The mean of correct responses for Task A was compared between groups through a one-way ANOVA.
Contextual indices for Task B were compared using 2 × 2 × 4 repeated-measures ANOVAs, comprising the factors of group (AOs, NOs), condition (congruent, incongruent), and type of emotion (anger, sadness, disgust, fear).
To calculate categorization accuracy, we analyzed the mean of correct responses to determine the emotion conveyed by the face in congruent scenarios (where face and body convey the same emotions) and in incongruent scenarios (where face and body convey different types of emotions). To estimate the contextual index, we analyzed the percentage of times the face was labeled as expressing the contextual body emotion (e.g., when a disgust face in a fear context is labeled as expressing fear), as opposed to any other emotion. We calculated: (a) a measure for congruent context—identical to categorization accuracy for congruent trials; and (b) a measure for incongruent contexts—the degree to which contextual information (i.e., body language) affects facial emotion recognition.
Additionally, and based on the presence of a triple interaction between group, condition, and type of emotion, we ran new independent 2 × 2 ANOVA for each emotion using group (AOs, NOs) as a between-subjects factor and condition (congruent, incongruent) as a within-subjects factor. We followed this procedure to determine, in each emotion, which particular contrast between group and condition could exhibit significant differences. Since the groups differed in educational level and EFs (Table 1), both variables were entered as covariates in the behavioral analyses of tasks A and B, adjusted independently for years of education and IFS scores. Only those effects that remained significant after covariation were reported. Effect sizes were calculated through partial eta squared (η2).
We ran post hoc Tukey analyses to assess significant differences in the contrast of congruency of situations, type of emotions, and group. We used this post hoc index considering that the observations to be tested are independent within and among the groups. We assumed that the mean of results should be normally distributed, and that there is equal within-group variance across the groups associated with each mean in the test (homogeneity of variance).
The relationship between EFs, behavioral disturbances, and performance on contextual indices in AOs was explored conducting multiple regression analyses. We ran a regression model for each contextual index. Different measures tracking behavioral disturbances (including months of jail imprisonment and number of relapses) were introduced as predictors in each regression model.
We also assessed whether measures of disorderly conduct in AOs (months of jail sentence and number of relapses) mediated the association between total IFS scores and measures of face-body emotion integration (e.g., categorization accuracy and contextual influence index). To this end, we ran an independent mediation analysis for each face-body emotion integration measure.
VBM Data Analysis
To explore regional GM reduction in AOs relative to NOs, we performed a two-sample comparison including total intracranial volume, IFS scores, and years of education as confounding covariates. Additionally, we searched for possible associations between brain morphometry and task performance. To this end, we used the tasks’ performance indexes as regressors and implemented a whole-brain analysis following previous procedures (Santamaría-García et al., 2017; Baez et al., 2018b). The statistical threshold for all whole-brain analyses was set at p < 0.001 (extent threshold ≥30 voxels).
Relationship Between Brain Morphometry and Contextual Indices.
Multiple regression analyses were performed to explore the association between regional GM and measures showing significant between-group differences. To this end, and following previous procedures (Melloni et al., 2016; O’Callaghan et al., 2016; Santamaría-García et al., 2017), we included both AOs and NOs in a single set (all subjects) to increase behavioral variance and statistical power by increasing sample size, giving stability of VBM results, and enhancing the consistency of the anatomical correlates of the cognitive measure analyzed.
In a second stage aimed to assess the specific association between brain volume and behavior, we conducted the same analysis only in AOs. This approach allows exploring which areas are critical for a particular cognitive process (see Melloni et al., 2016; O’Callaghan et al., 2016; Santamaría-García et al., 2017; Shahid et al., 2017). As a complementary analysis, we also examined the specific association between GM volume and behavior in the NO group. For all analyses, total IFS scores, years of education, and total intracranial volume were included as covariates of no-interest (p < 0.001 uncorrected, extent threshold ≥30 voxels).
Task A: Recognition of Context (Body Alone)
This task yielded no type of emotion effect (F(3,189) = 1.79, p = 0.45, η = 0.01), no group differences (F(1,64) = 0.38, p = 0.84), and no interaction between emotion and group (F(3,189) = 1.25, p = 0.49, η2 = 0.01; Figure 2A). In agreement with a previous study (Kret and de Gelder, 2013), accuracy in each group exceeded 75%.
Figure 2. Panel (A) shows percentage of correct labeling of emotions in Task A (context alone) in adolescents offenders (AOs) and non-offenders (NOs). Panels (B,C) show the performance in the two contextual indices (categorization accuracy and contextual influence) of Task B. Asterisks depict significant differences between groups. Panels (D,E) show the significant correlations between gray matter (GM) volume and performance in categorization accuracy (D) and contextual influence (E) in all subjects. Colored brain areas depict significant brain-behavior correlations at p < 0.001 (uncorrected). *Indicates a statistically significant contrast.
Task B: Contextual Effects
As regards categorization accuracy, ANOVA results revealed a main effect of congruency (F(1,60) = 141.91, p < 0.0000, η2 = 0.70), a main effect of type of emotion (F(3,180) = 25.79, p < 0.000, η2 = 0.30), an interaction between emotion and group (F(3,180) = 4.25, p < 0.01, η2 = 0.06), and a triple interaction among group, congruency, and emotion (F(3.180) = 3.45, p < 0.01, η2 = 0.06). A post hoc analysis (Tukey’s HSD, MS = 81.24, df = 63) showed that AOs performed worse than NOs on incongruent items (p < 0.01). No differences were observed for the congruent condition (p > 0.3; Figure 2B). The group’s differences in EFs did not explain the aforementioned pattern of results as the contrasts remained significant when it was introduced the EFs as covariate. In particular, it was maintained the main effect of congruency (F(1,60) = 11.30, p < 0.001, η2 = 0.16), as well as the main effect of the type of emotion (F(3,180) = 5.58, p < 0.001, η2 = 0.08), and the triple interaction among group, congruency and emotion (F(3,180) = 3.09, p < 0.05, η2 = 0.05).
Concerning the contextual influence index, ANOVA results revealed a main effect of congruency (F(1,189) = 439.15, p < 0.0000, η2 = 0.88), a main effect of type of emotion (F(3,189) = 26.6, p < 0.000, η2 = 0.28), an interaction between group and congruency (F(3,189) = 11.42, p < 0.001, η2 = 0.15), an interaction between emotion and group (F(3,189) = 4.57, p < 0.01, η2 = 0.06), and a triple interaction among group, congruency, and emotion (F(3,189) = 4.14, p < 0.01, η2 = 0.06). The post hoc analysis (Tukey’s HSD, MS = 85.49, df = 63) revealed that, compared to NOs, AOs were significantly more likely to label the facial emotion as that displayed by the context for incongruent items (p < 0.01), there being no differences on congruent ones (p > 0.4; Figure 2C). As occurred with categorization accuracy, the EFs did not fully explain the pattern of results as most of contrast remained significant after introduced as covariate factor the EFs. In particular, results revealed a significant interaction group by congruency (F(1,62) = 5.18, p < 0.05, η2 = 0.07), a main effect of the type of emotion (F(3,180) = 2.71, p < 0.05, η2 = 0.04), as well as it was significant the triple interaction among group, congruency and emotion (F(3,180) = 2.69, p < 0.05, η2 = 0.03). The rest of contrast did not reach significant results.
A particular pattern of results was observed for both indices (categorization accuracy and contextual influence) for each emotion (anger, fear, disgust, and sadness). In particular, AOs exhibited lower categorization accuracy than NOs in perceiving incongruent situations of negative emotions including sadness and fear. In addition, AOs exhibited a greater contextual influence in the presence of incongruent situations of hostile emotions including disgust and anger.
Five participants of the AO group showed extreme values in the contextual influence index. Significant values in both contextual indices did not change upon removal of those subjects.
Contextual Influence Scores Without Outliers.
Five participants of the AO group showed extreme values in the contextual influence index as they scored 3 SD above the group’s mean. In general, for both measures (categorization accuracy and contextual influence), the results remained similar to those obtained without excluding the outliers.
In particular, for categorization accuracy, results showed worse performance for AOs than NOs on incongruent items. The analyses showed a main effect of congruency (F(1,58) = 3.34, p < 0.05, η2 = 0.07), group (F(1,58) = 2.91, p < 0.05, η2 = 0.07) as well as a significant group-by-congruency interaction (F(1,58) = 2.45, p < 0.05, η2 = 0.06). A post hoc analysis (Tukey’s HSD, MS = 81.24, df = 63) showed that AOs performed worse than NOs on incongruent items (p < 0.05). No differences in performance were observed for the congruent items (p > 0.7).
In line with categorization accuracy outcomes, results of the contextual influence measure showed that AOs performed worse than NOs on incongruent items. The analyses showed a main effect of congruency (F(1,58) = 2.15, p < 0.05, η2 = 0.05), but not of group (F(1,58) = 1.33, p = 0.29, η2 = 0.01); and a significant group-by-congruency interaction (F(1,58) = 2.14, p < 0.05, η2 = 0.06). The post hoc analysis (Tukey’s HSD, MS = 85.49, df = 63) revealed that the AO group was significantly more able to label the facial emotion as that displayed by the context for incongruent items (p < 0.05), there being no differences for the congruent ones (p > 0.4).
Contextual Indices Analyses for Each Emotion
For categorization accuracy, we observed a main effect of congruency (F(1,63) = 5.06, p < 0.05, η2 = 0.76), but not of group (F(1,63) = 3.07, p = 0.06, η2 = 0.09). The interaction of group by congruency was also non-significant (F(1,63) = 0.47, p = 0.64, η2 = 0.01). For contextual influence, we observed a group-by-congruency interaction (F(1,63) = 8.68, p < 0.001, η2 = 0.21), but no effects of congruency (F(1,63) = 3.32, p = 0.07, η2 = 0.05) no group (F(1,63) = 1.77, p = 0.38, η2 = 0.03). The post hoc analysis (Tukey’s HSD, MS = 85.49, df = 63) revealed more contextual influence for the AOs group compared to NOs on the incongruent items (p < 0.01), without differences for congruent items (p > 0.4).
For categorization accuracy, the only significant result corresponded to the congruency-by-group interaction (F(1,63) = 4.81, p < 0.01, η2 = 0.13). No effects of group (F(1,63) = 0.9, p = 0.41, η2 = 0.02) or congruency (F(1,63) = 0.03, p = 0.85, η2 = 0.01) were observed. The post hoc analysis (Tukey’s HSD, MS = 85.49, df = 63) revealed worse performance in the AOs group compared to NOs for the incongruent items (p < 0.01), without differences for congruent items (p > 0.4). Contextual influence analyses showed no significant effects of congruency (F(1,63) = 0.02, p = 0.96, η2 = 0.00) or group (F(1,63) = 2.08, p = 0.13, η2 = 0.06). The group-by-congruency was also non-significant (F(1,63) = 0.21, p = 0.81, η2 = 0.00).
For categorization accuracy analyses showed no effects of congruency (F(1,63) = 1.32, p = 0.25, η2 = 0.02), group (F(1,63) = 2.85, p = 0.06, η2 = 0.08), or interactions (F(1,63) = 1.94, p = 0.15, η2 = 0.05) were observed. For contextual influence, a main effect of congruency (F(1,63) = 5.74, p < 0.02, η2 = 0.08), and an interaction of group × congruency (F(1,63) = 4.51, p < 0.05, η2 = 0.12) were observed. No effects of group (F(1,63) = 2.83, p = 0.09, η2 = 0.07) were observed. A post hoc analysis (Tukey’s HSD, MS = 85.49, df = 63) revealed more contextual influence in the AOs group compared to the NOs group for the congruent items (p < 0.01), without differences for incongruent items (p > 0.42).
For categorization accuracy analyses showed significant effects of congruency (F(1,63) = 4.91, p < 0.05, η2 = 0.07), group (F(1,63) = 4.26, p < 0.05, η2 = 0.12), and an interaction of group × congruency (F(1,63) = 3.6, p < 0.05, η2 = 0.11). A post hoc analysis (Tukey’s HSD, MS = 85.49, df = 63) revealed worst performance in the AOs group compared to NOs group for the incongruent items (p < 0.01), without differences for congruent items (p > 0.1). For contextual influence, only a main effect of congruency (F(1,63) = 18.5, p < 0.001, η2 = 0.22) was observed. No effects of group (F(1,63) = 0.57, p = 0.56, η2 = 0.01) or interaction group × congruency (F(1,63) = 0.62, p = 0.54, η2 = 0.01) were observed.
Relationship Between Levels of Disorderly Conduct, EFs, and Contextual Indices
A regression model including the total IFS score (as a measure of EFs) and the measures of disorderly conduct (months of jail sentence and number of relapses) reached significant values (F(1,34) = 3.23, p < 0.05, R2 = 0.23) and showed that EFs (η = 0.36, p < 0.05, η2 = 0.09), number of relapses (η = −0.23, p < 0.05, η2 = 0.09), and months of jail sentence (η = −0.21, p < 0.05, η2 = 0.09) explained the variance of categorization accuracy index. A similar model over the contextual influence index (F(1,34) = 4.21, p < 0.05, R2 = 0.12) showed that its variance was explained by EFs (η = −0.29, p < 0.05, η2 = 0.09) and number of relapses (η = 0.24, p < 0.05, η2 = 0.09), but not months of jail sentence (η = 0.13, p = 0.12, η2 = 0.04).
Mediation of Disorderly Conduct in the Association Between EFs and Contextual Indexes
The analyses revealed a significant association between total IFS score and categorization accuracy (F(1,34) = 4.58, p < 0.05, R2 = 0.26), which was partially mediated by disorderly conduct measures (relapses and months of jail). In particular, an independent regression using the categorization accuracy as dependent measure, EFs as independent measure, and each disorderly conduct measure as mediation indexes remained significant although the values of F decreased in relation to the regression without mediation indexes. On the one hand, the regression using the number of relapses as mediation index showed lower F values (F(1,34) = 3.23, p < 0.05, R2 = 0.23) but revealed that both EFs (η = 0.27, p < 0.05, η2 = 0.06) and relapses (η = 0.21, p < 0.05, η2 = 0.05) explained the variance of the dependent measure. On the other hand, the regression using months of jail as mediation index showed lower F values (F(1,34) = 3.12, p < 0.05, R2 = 0.19) and revealed that both EFs (η = 0.36, p < 0.01, η2= 0.04) and months of jail (η = −0.23, p < 0.05, η2= 0.06) explained the variance of categorization accuracy.
Also, a regression using the contextual influence index as dependent measure and EFs as independent measure reached significant values (F(1,34) = 5.31, p < 0.05, R2 = 0.38). This association remained significant but with reduced F values upon introduction of the relapses as mediation index (F(1,34) = 4.21, p < 0.05, R2 = 0.12). This analysis also revealed that both EFs (η = 0.31, p < 0.05, η2 = 0.06) and relapses (η = −0.29, p < 0.05, η2 = 0.06) partially explained the variance of the contextual influence index. The analyses revealed no mediation effect of months of jail on the relationship between EFs and the contextual influence index (F(1,34) = 3.88, p < 0.05, R2 = 0.08; i.e., the EFs explained the variance of the contextual influence index (η = 0.21, p < 0.02, η2 = 0.04) but months of jail did not reach significant values (η = −0.11, p = 0.21, η2 = 0.01).
Relationship Between EFs and Contextual Indices in AOs and NOs
No significant correlations were observed between categorization accuracy (AOs: r = 0.03, p = 0.84; NOs: r = 0.16, p = 0.37) or contextual influence (AOs: r = 0.03, p = 0.84; NOs: r = 0.16, p = 0.37) and the total IFS scores in any group.
Categorization accuracy was significantly associated with IFS scores in both groups (AOs: r = 0.40, p < 0.01; NOs: r = 0.58, p < 0.01). Contextual influence indices were significantly associated with total IFS scores in AOs (r = −0.38, p < 0.05), but not in NOs (r = −0.32, p = 0.07).
GM Volume Differences Between AOs and NOs
The comparison between groups (at a threshold of p < 0.001 uncorrected) showed that AOs exhibited less GM volume in the postcentral gyrus. Using a more lenient threshold (p < 0.01, uncorrected), the comparison showed that AOs also exhibited GM reduction in the bilateral cerebellum, the right precuneus, the angular gyrus, and the precentral gyrus (see Table 3).
Table 3. Regions of significant (local maxima) reduced gray matter (GM) volume in AOs compared with NOs.
Relationship Between Brain Morphometry and Contextual Indices (Task B) in AOs and NOs
Regression analyses in AOs and NOs revealed a significant positive association between categorization accuracy and GM volume of the bilateral FG, the left CC, the right precuneus, and the right cerebellum (Figure 2D). A negative correlation also emerged between the contextual influence index and GM volume of the bilateral precuneus, the left STG, and the left SMA (Figure 2E and Table 4).
A similar pattern was observed when analyzing brain-behavior correlations in AOs only. In particular, the analyses showed a significant positive association between categorization accuracy and GM volume of the bilateral FG. In addition, a negative correlation also emerged between the contextual influence index and GM volume of the bilateral precuneus and CC (see Table 5).
For NOs, regression analyses revealed a significant positive association between categorization accuracy and GM volume of the right FG. A negative correlation also emerged between the contextual influence index and GM volume of right superior temporal lobe and right insula (Table 6).
This study examined how contextual body language modulates facial emotion recognition in AOs, also exploring neuroanatomical markers of such integration. Results showed a greater influence of context (body language) on face emotion recognition in AOs compared to NOs, mainly affecting the integration of incongruent trials. This increased context-sensitivity was associated to measures of EFs and disruptive behaviors, as well as to the morphology of brain areas involved in body perception, contextual integration, and processing of conflicting emotional stimuli.
In agreement with previous research on similar populations (Kret and de Gelder, 2013), results of Task A showed no between-group differences in recognizing emotional cues conveyed by bodies. Instead, Task B revealed divergent profiles between AOs and NOs for both contextual measures. While the two groups performed similarly on congruent face-body trials, they differed when responding to incongruent contexts. Particularly, AOs exhibited poorer emotion categorization accuracy than NOs and higher susceptibility to the contextual influence of body cues on emotion identification. Although the mismatch between bodily and facial information affected emotion recognition in both groups, AOs were more prone to labeling faces in terms of the emotion conveyed by body language.
Analyses of face-body integration for each type of emotions reveal two major differences between groups in both contextual indices. First, AOs exhibited poor categorization accuracy for labeling sadness and fear emotions in incongruent situations compared to NOs group. No differences between groups were observed in contextual influence measure for those emotions. Second, AOs had more contextual influence than the NOs group for the incongruent items of hostile emotions including anger and disgust. Categorization accuracy analyses of these emotions did not reveal significant group differences.
The current results seem to suggest that both types of alterations might be coexist in AOs, as they presented reduced categorization accuracy of perceiving negative emotions alongside a greater influence of body context for hostile emotions (disgust and anger). Together, those results reveal major difficulties in processing emotions in incongruent context, as AOs tend to be more affected by body signals.
Our results confirm the increased sensitivity of ecological tasks tapping contextual information (Baez et al., 2012, 2017a; Ibañez and Manes, 2012; Amoruso et al., 2013). Moreover, they suggest that, relative to NOs, AOs tend to overvalue body signals in contextual emotion recognition. These findings align with previous studies on adult offenders (Grèzes et al., 2007) showing that, in incongruent scenarios, the judgment of target emotions may be hampered and become biased toward body-based and contextual emotional cues. Furthermore, our results are consistent with a previous study reporting impaired contextual emotional integration in AOs via emotional situations staged in real-life videos (Gonzalez-Gadea et al., 2014).
The pattern of results in each emotion supports previous theories on the relationship between emotion recognition and aggressive behaviors in offenders (Sato et al., 2009; Bowen et al., 2014). Those theories postulate that offenders present defensive and maladaptive behaviors associated to both greater sensitivity towards negative signals, such as disgust or anger emotions (Dodge et al., 1990), and reduced ability in recognizing social signals of distress—including negative emotions such as sadness and fear (Blair et al., 2001; Bowen et al., 2014). These patterns have also been associated with reduced activity of frontal networks (Best et al., 2002; Sato et al., 2009).
Our results align with previous studies showing that implicit integration of emotional signals transcends facial information and relies on the dynamic perception of internal and external stimuli, including interoceptive signals, complex sensory-perceptual inputs, and contextual cues (de Gelder et al., 1999, 2004; Aviezer et al., 2012; Van den Stock et al., 2014; Wieser and Keil, 2014; Ferrari et al., 2016; Davies-Thompson et al., 2018). Furthermore, in agreement with previous studies, our results support the idea that body signals are highly salient in the process of perceiving relevant emotional information from context (Aviezer et al., 2009, 2012; Bachmann et al., 2018). This is particularly relevant in offenders, considering that those subjects are continuously tracking potential threats in the environment.
Previous studies associated facial emotion recognition in AOs to disruptive behaviors (Fairchild et al., 2009, 2010; Sato et al., 2009). As predicted, our results showed that, in these subjects, the latter variable (i.e., number relapses and months of jail sentence) was related to an over-estimation of body signals. Misinterpretation of body cues may impel AOs to activate a “fight mode,” increasing behavioral reactivity and externalized behaviors. This explanation is supported by evidence that adult offenders tend to infer hostile messages in undifferentiated body cues (Kret and de Gelder, 2013). Thus, externalizing behaviors and poor appraisal of contextual information could be considered a key determinant of AOs’ social behavior.
Also, in agreement with previous studies (Escobar et al., 2014; Ibáñez et al., 2014), we showed that EFs are associated with emotion recognition. However, the described pattern of results for both contextual measures remained significant after covariation with EFs and education level, suggesting that contextual integration effects in AOs are not completely explained by (domain-general) cognitive difficulties.
Furthermore, mediation analyses revealed that disorderly conduct mediated the relationship between EFs and contextual integration tasks. The presence of conduct disorders could affect emotion perception by introducing less adaptive bodily and behavioral postures for perceiving emotional information. In fact, previous studies have suggested that emotional information is situated and embodied, the perception of emotional cues is supported by congruent corporal dynamic (Neal and Chartrand, 2011). Thus, the presence of an altered behavioral and corporal disposition, as occurs in AOs with disorderly conduct, could affect more flexible and embodied forms of emotional perception.
Additionally, our results point to a dynamic cycle of cognitive-behavioral functioning in AOs. These subjects usually exhibit alterations in executive functioning, emotional regulation, and emotional perception, as well as a tendency to overvalue body emotional signals and detect them as threats. Those dysfunctions are implicitly associated to externalizing behaviors including conduct disorders (Tamietto and de Gelder, 2010). Arguably, AOs with more severe behavior disorders could exhibit greater reactivity in perceiving the most salient behavioral and emotional signals (in this case, body signals over other subtle signals), as they can convey implicit threats. Future studies should assess how AOs perceive and integrate subtle emotional information and non-threatening signals in comparison to healthy individuals. Furthermore, the extent to which conduct disturbances affect emotional integration processes should be more actively explored in future studies.
Arguably, subjects with more externalizing and anxiety symptoms tend to recognize ambiguous signals as threatening cues (Kret and de Gelder, 2013; Philipp-Wiegmann et al., 2017). Thus, negative emotions, rather than positive ones, seem to be more sensitive in revealing difficulties for integrating contextual cues. Given that this study only included negative emotions, future studies in AOs should assess contextual effects on positive emotion recognition, and relevant structural correlates.
Crucially, our results revealed brain volume differences between AOs and NOs. In agreement with previously reported evidence (Rogers and De Brito, 2016; Budhiraja et al., 2017), the AOs group showed reduced GM volumes in the right precuneus, the angular gyrus, and the precentral gyrus. These areas have been previously implicated in different socio-cognitive operations, including the detection of social and emotional signals, mentalizing processes, regulation of social behaviors, and moral judgment (Cope et al., 2014).
Concerning to the association of contextual indexes and GM, the higher the categorization accuracy was associated to a higher the GM volume in the bilateral FG, the left CC, the right cerebellum, and the right precuneus. The FG is classically implicated in face (Kanwisher and Yovel, 2006) and body (Schwarzlose et al., 2005) perception. Crucially, this area is sensitive to emotional information conveyed by both types of stimulus (Peelen et al., 2007). Compatibly, our findings suggest that, beyond its putative functional roles, FG anatomy is related to face and body recognition skills (Onitsuka et al., 2003). Also, the association between cerebellar GM volume and categorization accuracy confirms the involvement of this area in categorical perception of faces and body (Van den Stock et al., 2014), and its role in motor resonance when body postures revealing movement are perceived (Sokolov et al., 2010). Furthermore, the relationship with CC also supports the role of this area in processing conflictive emotional information (Etkin et al., 2011), mobilizing defensive responses in the presence of conflictive emotions (Pereira et al., 2010), and integrating contextualized emotional information (Maren et al., 2013). Finally, the association with GM volume in the precuneus may reflect this region’s involvement in modulating attention towards dominant facial cues during emotion perception (Zhang and Li, 2012).
Furthermore, we found that a greater bias towards body information (contextual influence) was associated to lower GM volume of the left STG and SMA, and the bilateral precuneus. Consistent with our results, the STG has been implicated in processing affective features of faces and bodies (van de Riet et al., 2009). For their part, the SMA and the precuneus are involved in motor resonance of complex emotional stimuli (Orgs et al., 2016) and attention to emotional information in context (Van den Stock et al., 2011). Of note, in our study, the GM volume of precuneus was associated to both contextual measures. This may suggest a crucial role of such a region in tasks requiring high attentional efforts for integrating conflictive emotional stimuli conveyed by faces and bodies.
For NOs, in line with previous studies (Van den Stock et al., 2014; Kumfor et al., 2018), our results revealed an association between categorization accuracy and GM volume of the right FG. Furthermore, confirming previous evidence, our study revealed an association between the contextual influence index and GM volume of the STG (Kumfor et al., 2018), a region involved in processing of social and emotional signals. Our results also revealed a significant association between the contextual influence index and GM volume in the precuneus and the insula, two areas involved in the processing of emotional body language (Ahmed et al., 2015) and the monitoring and representation of bodily states (Karnath et al., 2005; Peelen and Downing, 2007; Peelen et al., 2007), respectively.
Summarizing, brain-behavior correlations showed that the integration of body cues in emotion recognition are supported by brain areas involved in body-face recognition (FG; Peelen et al., 2007), emotion processing (CC, STG, FG; Pereira et al., 2010), contextual integration (precuneus, STG; van de Riet et al., 2009), and motor resonance (cerebellum, SMA; de Gelder, 2006). This pattern of associations for both measures was maintained when AOs were analyzed separately. These results indicate that the integration of bodily and facial emotional cues in incongruent scenarios is a complex process recruiting areas implicated in tracking conflicting emotion information, beyond classical areas subserving the recognition of bodily and facial signals.
One limitation of our study consists in the lack of standardized measures tracking disruptive and externalized behaviors, which could help to clarify the association between face-body emotion recognition and behavioral disorders in AOs. Future studies might explore the interplay between contextual emotional recognition and levels of disorderly conduct in this population through standardized assessment of relevant factors.
Another potential limitation of our study is that the groups differed in terms of EF scores and educational level. Concerning EFs, previous studies have reported reduced scores in executive tasks in AOs compared to healthy controls (Gonzalez-Gadea et al., 2014; Seruca and Silva, 2016). Additionally, note that AOs typically present high school dropout rates and poor academic achievements (Breslau et al., 2009; McLeod et al., 2012). However, as shown by the covariation and regression analyses, EFs and educational differences did not explain the group’s differences in the categorization accuracy and contextual influence measures. Future studies should explore the extent to which integration of emotional information from faces and bodies modulate particular subtypes of EFs, including emotion regulation and cognitive control. In fact, previous studies have revealed differences in cognitive control flexibility and planning in AOs with different type of offenses (Seruca and Silva, 2016).
Although we targeted a particular sample of Colombian AOs, our sample shared demographic factors, and the profile of offenses to samples assessed in previous studies (Brazil et al., 2013; Zou et al., 2013; Vilà-Balló et al., 2015), including reports assessing specific cognitive, emotional, and socio- cognitive processes (see Gonzalez-Gadea et al., 2014; Baez et al., 2018a). In fact, the AOs tested herein resembled those of previous samples from other countries in terms of demography (sharing sex, ages, socio-cultural background), behavioral disturbances (including months of jail and relapses), and type of offenses (including offenses such as homicide, sexual related offences, extortion among other offenses; see Brazil et al., 2013; Zou et al., 2013; Vilà-Balló et al., 2015). Nevertheless, the assessment of socio-cognitive processes in AOs should include a more varied sample of offenders from different sociocultural backgrounds. Thus, future research should assess to what extent the particular contextual and social conditions experienced by AOs in this study modulate the processes under study.
To summarize in this study, we assessed body-face and contextual emotional integration in AOs and NOs. Our results suggest that AOs tend to overvalue body signals in contextual emotion recognition. The sensitivity to body information in this group was associated to GM volume of brain areas involved in integrating bodily cues, updating contextual information, and processing emotion-laden stimuli in conflictive contexts. Finally, our results pave the way for a better understanding of the association between contextual emotion recognition, behavioral regulation and externalized behaviors in AOs. Further research along these lines may provide insights on potential avenues for rehabilitation of social cognition difficulties in AOs (e.g., by providing complementary contextual information to enhance understanding of social cues).
The dataset generated by this study is available on request to the corresponding author.
HS-G, SB, AI, CI, MP, SM, and AG developed the study concept and the study design. MP, SM, and CA performed testing and data collection. SB, HS-G, and MP-S performed the data analysis and interpretation under the supervision of SB. HS-G, AG, and SB drafted the manuscript. AI and AG provided critical revisions. All authors have participated sufficiently in the work and approved the final version of the manuscript for submission.
This work was partially supported by grants from CONICET, CONICYT/FONDECYT Regular (1170010), FONCyT-PICT 2017-1818, FONCyT-PICT 2017-1820, FONDAP 15150012, the INECO Foundation, the Centro de Memoria y Cognition Intellectus, Hospital Universitario San Ignacio.
Conflict of Interest Statement
The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.
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