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versión impresa ISSN 0213-6163
Eur. J. Psychiat. vol.26 no.2 abr./jun. 2012
Wiebke Wolfkühler*,**; Karina Majorek*,**; Cumhur Tas*,**; Christian Küper***; Nahlah Saimed****; Georg Juckel*; Martin Brüne*,***
*Department of Psychiatry, University of Bochum, LWL University Hospital. Germany.
**Research Department of Cognitive Neuropsychiatry and Psychiatric Preventive Medicine, University of Bochum, LWL University Hospital. Germany.
***Department of Child and Adolescence Psychiatry, Bertha Hospital Oberhausen. Germany.
****Department of Forensic Psychiatry, LWL Hospital Lippstadt. Germany.
Background and Objectives: Abundant research has demonstrated that patients with schizophrenia have difficulties in recognizing the emotional content in facial expressions. However, there is a paucity of studies on emotion recognition in schizophrenia patients with a history of violent behavior compared to patients without a criminal record.
Methods: Emotion recognition skills were examined in thirty-three forensic patients with schizophrenia. In addition, executive function and psychopathology was assessed. Results were compared to a group of 38 schizophrenia patients in regular psychiatric care and to a healthy control group.
Results: Both patient groups performed more poorly on almost all tasks compared to controls. However, in the forensic group the recognition of the expression of disgust was preserved. When the excitement factor of the Positive and Negative Syndrome Scale was co-varied out, forensic patients outperformed the non-forensic patient group on emotion recognition across modalities.
Conclusions: The superior recognition of disgust could be uniquely associated with delinquent behavior.
Key words: Emotion recognition; Disgust; Executive functioning; Psychopathology; Schizophrenia.
Emotion recognition from facial expressions is a cornerstone of social interaction1,2. The ability to decipher emotions in faces is universal across cultures, especially when focusing on the basic emotions of happiness, anger, disgust, sadness, fear, surprise and contempt3. Impairment in recognizing facial expressions of emotion is characteristic of schizophrenia4-7. Poor emotion recognition in schizophrenia has been found to be associated with poor social functioning8-10. There is still contest about the question, however, whether poor emotion recognition in schizophrenia is more profound for negative emotions such as fear, anger, sadness, and disgust1,6,11,12, or whether patients with schizophrenia exhibit a more global deficit in emotion recognition13,14. Also, the question of whether or not the emotion recognition deficit in schizophrenia is limited to facial expressions15 or the consequence of a more generalized performance deficit16,17 remains to some extent elusive.
In any event, false interpretation of facial affect may lead to inappropriate social behavior, including impulsive aggression even in innocuous social situations18. Conversely, aggressive responses seem to be suppressed in healthy individuals when recognizing fear in others19. Consistent with this explanation, Hoaken et al.18 found that non-clinical violent offenders were significantly worse in facial affect recognition compared to non-violent offenders and controls, and that emotion recognition correlated with executive functioning abilities including associative learning, strategy formulation as well as working memory18.
In forensic samples diagnosed with schizophrenia, only a few studies have addressed emotion recognition abilities. Weiss et al.19 discovered in patients with either schizophrenia or schizoaffective disorder with a criminal record that emotion recognition impairments were associated with higher numbers of incarcerations19. Likewise, Fullam and Dolan20 revealed impaired emotion recognition in male schizophrenia patients who also fulfilled the criteria for psychopathy20. The degree of impairment in recognising emotions in facial expressions was associated with the severity of psychopathy, particularly regarding fear and sadness. However, these studies have limited explanatory power due to a lack of a clinical control group.
Accordingly, in the present study we sought to investigate whether or not emotion recognition from facial expressions is impaired in forensic patients with schizophrenia compared to non-violent schizophrenic patients and a group of healthy controls. Moreover, we were interested in the question as to what extent emotion recognition was associated with executive functioning, and whether different patterns between the clinical groups emerged regarding the recognition of any specific expression of emotion.
Thirty patients (29 males, 1 female) diagnosed with schizophrenia according to ICD-10 diagnostic criteria for research21, who were treated in a high security forensic psychiatric hospital, were examined. Findings were compared with a sample of 30 schizophrenia patients (18 males, 12 females) in a regular psychiatric hospital, diagnosed with schizophrenia according to ICD-10 diagnostic criteria for research, and with a group of 20 healthy controls (9 male, 11 female) recruited from students of psychology, their relatives, and hospital staff. Subjects with a history of traumatic brain injury or severe somatic disorders were excluded from the study. All participants gave full informed consent in writing after the procedure was fully explained and understood.
In the forensic group all but three patients (10%) received antipsychotic medication, four patients (13.3%) were treated with first-generation antipsychotics (FGA), another 11 (36.7%) received second-generation antipsychotics (SGA), and 11 patients (36.7%) received both FGA and SGA. In the non-forensic patient group, one patient (3.3%) was on FGA, 24 (80%) were treated with SGA, and five patients (16.7%) received a combination of FGA and SGA.
Among the forensic patients, 25 patients (83.3%) had a history of either drug or alcohol abuse, compared to 18 patients (60%) in the non-forensic group. No history of drug or alcohol abuse was found in the healthy control group. The forensic patients' mean age at onset of the disorder was 22.2 years (15-38 years; SD = 5.1 yrs.), and the mean duration of illness was 9.9 years (1-28 years; SD = 7.7 yrs.). The non-forensic patients' mean age at onset of the disorder was 23.8 years (15-44 years; SD = 6.6 yrs.), their mean duration of illness was 8.9 years (0-33 years; SD = 8.6 yrs.). At the time of assessment, the forensic patients' mean age was 32.2 years (range 20-50 years; SD = 7.3 yrs.), the non-forensic patients' mean age was 32.4 years (18-52 years; SD = 9.3 yrs.), and the healthy controls' mean age was 31.4 years (19-58 years; SD = 12.1 yrs.). The forensic group showed a heterogeneous pattern of criminal records, ranging from repetitive minor offenses (obstructing the police (n = 1), encroachment on traffic (n = 1), drink-driving (n = 1)) to capital crime (theft/robbery (n = 9), arson (n = 3), coercion (n = 1), criminal assault (n = 1), serial sexual offences (n = 4), severe bodily harm (n = 9), and manslaughter (n = 9)).
Emotion recognition tasks
Emotion recognition was assessed using the "Japanese And Caucasian Brief Affect Recognition Test"22, comprising 56 photographs of facial expressions of seven universal emotions (i.e., anger, contempt, disgust, fear, happiness, sadness, and surprise) with an equal distribution of poser race (28 expressions each) and sex (28 expressions each) across emotions. Every item was composed of the emotional expression embedded in the same poser's neutral expression and presented for 200 ms. Facial expressions were presented in randomized order. Participants were asked to name the respective emotion by clicking the allocated button on the computer screen using a standard PC mouse. To control for attention deficits, the same 56 photographs were shown expressing the neutral expression phase for 200 ms only. Participants were asked to indicate the gender of the presented face in the same way as they responded to the facial affect stimuli.
Executive functioning tasks
Cognitive flexibility was examined using a computerized and simplified version of the Wisconsin Card Sorting Test23. In addition, the first part of the Zoo Map Test taken from the Behavioral Assessment of the Dysexecutive Syndrome24 was used for testing executive planning skills.
Psychopathology was measured using the Positive and Negative Syndrome Scale25. We used a five-factor structure for the PANSS comprising a negative, positive, excitement, cognitive and depression/anxiety component26. The patients' psychopathology was assessed blind to their performance on the executive functioning and emotion recognition tasks.
For normally distributed variables, we used parametric tests including Bonferroni-corrected ANOVAs for post-hoc comparisons between healthy controls and the two patient groups, as well as student's t-tests for comparisons between forensic and non-forensic patients. For non-normally distributed variables we used the appropriate nonparametric tests including Mann-Whitney-U test for comparisons between the two patient groups and Kruskal-Wallis tests for comparisons between all three groups. Correlations were carried out using Pearson's correlation coefficient for normally distributed variables and Spearman's rho for non- normally distributed or interval-scaled variables. Statistical analysis was conducted using SPSS 16.0 for Windows.
Demographic variables and behavioral measures
No differences between the groups were found with regard to age (F = 0.67, df = 2, p = 0.935). However, there was a significant difference between the groups in terms of gender distribution. In particular, males were over-represented in the forensic patient group (male to female ratio 29:1), com-pared to the non-forensic schizophrenia group (male to female ratio 18:12), and controls (male to female ratio 9:11). This difference was statistically significant (chi-square = 12.800, df = 1, p < 0.001). Both patient groups differed from controls regarding education, but not between each other (forensic vs. non-forensic: t = 0.684; df = 58; p = 0.497; forensic vs. controls: Mann-Whitney-U = 182.000; Z = -2.445; p = 0.014; non-forensic vs. controls: Mann-Whitney-U = 161.000; Z = -3.014; p = 0.003). Also, as expected, both patient groups made more errors in the executive functioning tasks than controls (WCST: p < 0.001; Zoo Map task p = 0.003), but did not differ between each other (ps = 0.64, and 1.0, respectively). Similarly, the amount of antipsychotic medication, as measured by the amount of chlorpromazine equivalents (t = 1.363; df = 42.421; p = 0.180) as well as the age at onset of the disorder (t = -1.016; df = 57; p= 0.314) did not differ between the two patient groups. However, forensic patients showed more frequently a history of drug or alcohol abuse than the non-forensic patients (Mann-Whitney-U = 345.000; Z = -1.989; p = 0.047). Demographic comparisons are summarized in Table 1.
Regarding psychopathology, no significant differences occurred between the two patient groups concerning positive symptoms (t = 0.976; df = 57; p = 0.333) or negative symptoms (t = 1.014; df = 51.016; p = 0.315). However, forensic patients showed significantly more cognitive symptoms (t = 2.298; df = 56; p= 0.025) and excitement-associated symptoms (t = 4.057; df = 57; p = < 0.001) than non-forensic schizophrenia patients (summarized in Table 2). Conversely, non-forensic patients showed more depression and anxiety symptoms than forensic patients (t = -2.261; df = 57; p = 0.028).
Both patient groups performed more poorly on most emotional displays than controls. Specifically, the non-forensic group was impaired, relative to controls, in the recognition of all seven basic emotions (all p < 0.05), except sadness, where non-forensic patients did not differ significantly from controls (MD = -1.233; SE = 0.522; p = 0.062). The same was true for the forensic group (all p < 0.05), except for disgust and fear where the forensic patients performed similar to controls (as regards disgust: MD = -0.700; SE = 0.511; p = 0.523; as regards fear: MD = -1.050; SE = 0.529; p = 0.152).
Concerning the comparison of emotion recognition between the two patient groups, no significant differences emerged in emotion recognition abilities (all p > 0.05), except for disgust, where the forensic group outperformed the non-forensic patient group (t = 3.225; df= 58; p=0.002). Notably, there was no difference between the patient groups and controls regarding sex recognition in either ethnicity (chi-square = 4.052, df = 2, p = 0.132).
Due to the significant differences regarding the participants' sex ratio we conducted ANCOVAs using sex as co-variate. However, no differences to the whole-group comparisons emerged, apart from the recognition of the emotions of sadness and fear, where no difference between the controls and either one of the patient groups occurred. Thus, the mixed-gender groups were used for further comparisons.
Since the two patient groups differed with regard to the cognitive, the excitement and the depression and anxiety component of the PANSS, we conducted ANCOVAs using the respective psychopathology subscores as co-variates. Accordingly, the forensic group still outperformed the non-forensic patient group with respect to disgust recognition (F = 8.277; df = 1; p = 0.006), and reached higher total scores in the emotion recognition task (F = 4.960; df = 1; p = 0.030) as well as in the recognition of emotions in Caucasian faces (F = 6.562; df = 1; p = 0.013) when the cognitive factor on the PANSS was co-varied out. When controlling for "excitement", the forensic group outperformed the non-forensic group regarding happiness (F = 4.417; df = 1; p = 0.040), fear (F = 5.401; df = 1; p = 0.024), disgust (F = 7.032; df = 1; p = 0.010), total emotion recognition score (F = 4.576; df = 1; p = 0.037) and emotion recognition in Caucasian faces (F = 4.654; df = 1; p = 0.035). When co-varying out the depression and anxiety component of the PANSS, the difference between the two patient groups with respect to disgust recognition remained significant (F = 7.978; df = 1; p = 0.007) but no other difference was obtained. No difference in emotion recognition - except disgust - emerged when controlling for age at onset of the schizophrenia (all p = > 0.05).
As expected, both patient groups performed more poorly than controls on both measures of executive functioning, but did not differ between each other. They both made more perseverative errors in the WCST than controls (forensic vs. controls: Mann-Whitney-U = 75.000; Z = -4.400 p = < 0.001; non-forensic vs. controls: Mann-Whitney-U = 117.000; Z = -3.465; p = 0.001; forensic vs. non-forensic: Mann-Whitney-U = 335.500; Z = -1.525; p = 0.127), and performed more poorly on the executive planning task. No difference emerged between the clinical groups regarding executive planning skills as measured using the Zoo Map Test (t = 0.620; df = 58; p = 0.538). For more details see Table 1.
Correlations within the two patient groups
Parametric correlation analyses in the forensic group revealed that emotion recognition (total score) correlated inversely with the amount of antipsychotic medication (r = -0.567, p = 0.001). In addition Spearman-Rho correlations revealed an inverse relationship of emotion recognition with the cognitive component (rho = -0.456, p = 0.013) and with the positive component of the PANSS (rho = -0.387, p = 0.038) in the forensic patient group, but with none of the other PANSS components (all other p > 0.05). No correlations of emotion recognition (total score) emerged with any one of the executive functioning tasks (i.e., WCST perseverative errors, Zoo Map Test (all p> 0.05), or with any of the demographic variables (i.e., age at onset of the schizophrenia, duration of illness, education (all p > 0.05) among forensic patients.
Similar to the forensic group, in the non-forensic patient group emotion recognition correlated inversely with the cognitive component of the PANSS (rho = -0.407, p = 0.029). There were no correlations between the non-forensic patients' global performance on the emotion recognition tasks with any of the other subscales of the PANSS (all p> 0.05), with any of the executive functioning tasks (i.e. WCST perseverative errors, Zoo Map Test (all p > 0.05)), or with any of the demographic variables (all p> 0.05). In contrast to the forensic patient group, no relationship emerged between emotion recognition tasks and chlorpromazine equivalents in the non-forensic group (p> 0.05).
Hierarchical regression analyses
Due to several confounding factors such as sex differences between the groups, differences in education and executive functioning, we performed a hierarchical regression analysis with "emotion recognition" as the dependent variable. To examine the contribution of each variable to the overall variance, we entered "sex", "education", the number of perseverative errors in the WCST, the Zoo Map score, the excitement component of the PANSS, the cognitive component of the PANSS and "group" (forensic, non-forensic, control) one at a time as independent variables in the equation. Preliminary analyses were conducted to ensure no violation of the assumptions of normality, linearity, multicollinearity. All steps of the hierarchical model were significant. In the final step, only the cognitive component of the PANSS (B = -0.355, p = 0.014) and diagnostic group (B = 0.274, p = 0.031) contributed significantly, where diagnostic group explained an additional 4% of the variance predicting emotion recognition, after controlling for all confounding factors (R squared change = 0.038, F change (1, 67) = 4.852, p = 0.031), whereas all other factors became non-significant (Table 4).
In a second hierarchical regression model, we used the same approach to determine the predictors of disgust recognition. Since the number of perseverative errors was not a predictor of emotion recognition in any one of the steps, we excluded this variable from the list of independent variables. In contrast to the first hierarchical regression analysis, only the last step of the model approached significance (p = 0.06), whereas the former steps were not significant. However, after controlling for all confounding factors "group" became the only significant factor predicting disgust recognition differences between the groups, explaining 12% of the variance (R2change = 0.123, Fchange (1, 70) = 10.167, p= 0.031) (Table 5). This suggests that the group differences in emotion recognition, including disgust, were largely independent of the confounding factors.
The present study sought to explore differences in the ability to recognize facial expressions of emotions between forensic and non-forensic schizophrenia patients. Similar to previous studies (for a review, see 6), both schizophrenia patient groups performed significantly more poorly on a novel emotion recognition task22 than healthy controls. The control group outperformed the non-forensic patients on all seven basic emotions as well as total emotion recognition score. Unexpectedly, however, the forensic group scored equally well as the control group in the recognition of disgust, whereas the control group outperformed the forensic patients on all other emotions. Accordingly, the forensic group performed significantly better than the non-forensic patient group with regard to disgust recognition, even when all other clinical and demographic parameters distinguishing the two clinical groups were co-varied out. In addition, hierarchical regression analyses demonstrated that the differences between the groups as regards emotion recognition, specifically disgust re-cognition, were independent of sex, education, executive functioning, and notably, lar-gely independent of psychopathology.
Earlier studies in schizophrenia discovered specific impairments of schizophrenia patients with respect to the recognition of disgust and fear12. In contrast, Harmer et al.27 found enhanced recognition of disgust in facial expressions in euthymic patients with bipolar disorder27, what they interpreted as a result of decreased self-esteem because of the illness. Nevertheless, Hayward et al.28 demonstrated an increased recognition of disgust in remitted patients with depression28. A similar argument was put forth by Martin et al.29 who found superior recognition of disgust in subjects with current opiate abuse29, which was interpreted as response to stigmatizing experiences including repeated exposure to facial expressions of disgust that may have caused hypersensitivity with regard to this expression. As an alternative explanation, the authors suggested that a negative self-concept may have heig-htened the sensitivity towards disgust29. Interestingly, a recent study by Hansen et al.30 revealed associations of various subscores of the Hare Psychopathy Checklist-Revised31 with the ability to recognize disgust30. In particular, impulsivity and antisocial behavior were positively correlated with the ability of psychopathic individuals to recognize disgust, whereas a negative relationship was found between an arrogant interpersonal style and the detection of disgust in female faces30. This may apply to the forensic patient group in the present study.
Consistent with this finding, forensic patients showed significantly more excitement and cognitive symptoms on the PANSS compared with non-forensic schizophrenia patients. When co-varying out the cognitive component (comprising conceptual disorganization, disorientation, and difficulty in abstract thinking, mannerisms and posturing as well as poor attention), the forensic patients outperformed the non-forensic schizophrenic patients on the total score of the emotion recognition task and recognition of emotions in Caucasian faces. More importantly, when controlling for the excitement component (comprising excitement, poor impulse control, hostility and tension) the expressions of happiness and fear were recognized better by forensic patients than non-forensic patients in addition to the superior disgust recognition of the former.
Interestingly, we found an inverse correlation between emotion recognition ability and antipsychotic medication in the forensic patient group but not in the non-forensic group. Both groups did not differ regarding the amount of antipsychotics as estimated in CPZ equivalents. Notably, forensic patients received more first-generation antipsychotics than the non-forensic patient group, the majority of who were treated with second-generation antipsychotics. It has repeatedly been demonstrated that patients receiving first-generation antipsychotic medication are impaired in comparison to patients treated with second-generation antipsychotics with respect to their emotion recognition ability32,33. However, the fact that the forensic group performed better than the non-forensic patient group on emotion recognition tasks rather supports the interpretation that medication either did not play a decisive role in our sample, or that the difference in favor of the forensic patients would have been even larger, had they received second-generation antipsychotics like the non-forensic patients.
Similar to previous studies34, our mostly Caucasian participants recognized emotional expressions in faces equally well irrespective of poser ethnicity. Notably, we did not obtain any difference regarding the gender recognition tasks between the three groups, which is in line with the findings of Bediou and colleagues1,4. This lends support to the assumption that schizophrenia patients have a specific deficit in facial emotion recognition rather than a more global face processing deficit. In the gender recognition there were only two options to choose the correct answer from, whereas in the emotion recognition task seven alternatives were presented, which arguably renders the gender recognition task easier than the emotion recognition task. However, the presentation time of 200 ms of each face put equal pressure on subjects in both conditions, which makes at least attention deficits unlikely to be the cause for the selective emotion recognition deficit in patients.
This study has several limitations. Firstly, we were unable to obtain PCL-R scores for our forensic sample, such that the possible association of psychopathic dimensions with disgust recognition in our forensic sample remains to some extent speculative, although previous studies have shown high rates of comorbidity between schizophrenia and psychopathy in forensic populations20. However, the usefulness of the PCL-R in schizophrenia has been a matter of some controversy35, since in one older study a large number of patients (50%) with schizophrenia was incorrectly diagnosed with comorbid psychopathy36. Secondly, the limited sample size precluded a meaningful subtyping of schizophrenia. This could be relevant, however, because patients with paranoid schizophrenia have been shown to perform better than non-paranoid patients on emotion recognition tasks5. It is conceivable that a paranoid subgroup of patients was overrepresented in our forensic sample, which might account for their preserved ability to identify disgust. Thirdly, both clinical groups were not ideally matched for sex and antipsychotic treatment. We tried to control for these confounding factors in a hierarchical regression analysis and found that they did not contribute to the differences in emotion recognition between the groups. However, future studies should take such differences into consideration. Fourthly, it would have been ideal to include a forensic and non-forensic control group, to further substantiate the hypothesis that differences in disgust recognition were related to a history of forensically relevant behavior. Finally, the JACBART was not validated in a German sample, so the present findings need to be regarded as explorative.
Novel approaches using specific training modules for improving social cognition in schizophrenia patients have proven successful, especially in forensic patients. The Social Cognition and Interaction (SCIT) program, for example, reduced hostility in forensic patients after a 16-week training of social cognition skills as well as it did increase cognitive flexibility and reduced need for closure37.
In summary, this finding could tentatively be interpreted to suggest that there are differences in emotion recognition between forensic and non-forensic patients within the spectrum of schizophrenia, a finding that could be relevant for the diagnostic evaluation of offenses associated with mental illness.
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Prof. Dr. Martin Brüne
Received: 4 May 2011
Revised: 26 January 2012
Accepted: 6 February 2012