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Stix K, Dalkner N, Bengesser SA, Birner A, Fellendorf FT, Häussl A, Lenger M, Maget A, Painold A, Platzer M, Queissner R, Schmiedhofer F, Schönthaler E, Schwerdtfeger A, Stross T, Tmava-Berisha A, Weber B, Unterrainer HF, Reininghaus EZ. Theory of mind abilities during the course of bipolar disorder: A longitudinal study using mixed models. Psychiatry Res 2024; 339:116039. [PMID: 38924901 DOI: 10.1016/j.psychres.2024.116039] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/17/2023] [Revised: 03/11/2024] [Accepted: 06/13/2024] [Indexed: 06/28/2024]
Abstract
Theory of mind (ToM) deficits, difficulties in recognizing the intentions, propensities, and beliefs of others have been shown in individuals with bipolar disorder in several studies; however, it is not yet elucidated how ToM abilities changes over the course of bipolar disorder and is related to illness symptoms. This is one of the first longitudinal studies to compare the ToM abilities of euthymic bipolar individuals and healthy controls over a four and a half years period. ToM abilities were measured using the Reading the Mind in the Eyes Test (RMET). A total of 91 euthymic bipolar individuals and 91 healthy controls were included in the analyses. Linear mixed models were used to compare ToM abilities of bipolar individuals and healthy controls. It was found that bipolar individuals scored lower on average on the RMET than healthy controls and that these RMET scores were stable over four and a half years. The results of this study suggest that ToM deficits are a stable (possibly endophenotypic) trait of bipolar disorder. This understanding can contribute to better identification, assessment, and treatment strategies for individuals with bipolar disorder, ultimately improving their overall care and outcome.
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Affiliation(s)
- Katharina Stix
- Department of Psychiatry and Psychotherapeutic Medicine, Medical University Graz, Auenbruggerplatz 31, 8036 Graz, Austria
| | - Nina Dalkner
- Department of Psychiatry and Psychotherapeutic Medicine, Medical University Graz, Auenbruggerplatz 31, 8036 Graz, Austria.
| | - Susanne A Bengesser
- Department of Psychiatry and Psychotherapeutic Medicine, Medical University Graz, Auenbruggerplatz 31, 8036 Graz, Austria
| | - Armin Birner
- Department of Psychiatry and Psychotherapeutic Medicine, Medical University Graz, Auenbruggerplatz 31, 8036 Graz, Austria
| | - Frederike T Fellendorf
- Department of Psychiatry and Psychotherapeutic Medicine, Medical University Graz, Auenbruggerplatz 31, 8036 Graz, Austria
| | - Alfred Häussl
- Department of Psychiatry and Psychotherapeutic Medicine, Medical University Graz, Auenbruggerplatz 31, 8036 Graz, Austria
| | - Melanie Lenger
- Department of Psychiatry and Psychotherapeutic Medicine, Medical University Graz, Auenbruggerplatz 31, 8036 Graz, Austria
| | - Alexander Maget
- Department of Psychiatry and Psychotherapeutic Medicine, Medical University Graz, Auenbruggerplatz 31, 8036 Graz, Austria
| | - Annamaria Painold
- Department of Psychiatry and Psychotherapeutic Medicine, Medical University Graz, Auenbruggerplatz 31, 8036 Graz, Austria
| | - Martina Platzer
- Department of Psychiatry and Psychotherapeutic Medicine, Medical University Graz, Auenbruggerplatz 31, 8036 Graz, Austria
| | - Robert Queissner
- Department of Psychiatry and Psychotherapeutic Medicine, Medical University Graz, Auenbruggerplatz 31, 8036 Graz, Austria
| | - Franziska Schmiedhofer
- Department of Psychiatry and Psychotherapeutic Medicine, Medical University Graz, Auenbruggerplatz 31, 8036 Graz, Austria
| | - Elena Schönthaler
- Department of Psychiatry and Psychotherapeutic Medicine, Medical University Graz, Auenbruggerplatz 31, 8036 Graz, Austria
| | | | - Tatjana Stross
- Department of Psychiatry and Psychotherapeutic Medicine, Medical University Graz, Auenbruggerplatz 31, 8036 Graz, Austria
| | - Adelina Tmava-Berisha
- Department of Psychiatry and Psychotherapeutic Medicine, Medical University Graz, Auenbruggerplatz 31, 8036 Graz, Austria
| | | | - Human-F Unterrainer
- Department of Psychiatry and Psychotherapeutic Medicine, Medical University Graz, Auenbruggerplatz 31, 8036 Graz, Austria; Institute of Psychology, University of Graz, Austria; Faculty of Psychotherapy Science, Sigmund Freud University, Vienna, Austria; Center for Integrative Addiction Research (CIAR), Grüner Kreis Society, Vienna, Austria; Department of Religious Studies, University of Vienna, Austria
| | - Eva Z Reininghaus
- Department of Psychiatry and Psychotherapeutic Medicine, Medical University Graz, Auenbruggerplatz 31, 8036 Graz, Austria
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Ding C, Li A, Xie S, Tian X, Li K, Fan L, Yan H, Chen J, Chen Y, Wang H, Guo H, Yang Y, Lv L, Wang H, Zhang H, Lu L, Zhang D, Zhang Z, Wang M, Jiang T, Liu B. Mapping Brain Synergy Dysfunction in Schizophrenia: Understanding Individual Differences and Underlying Molecular Mechanisms. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2024:e2400929. [PMID: 38900070 DOI: 10.1002/advs.202400929] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/25/2024] [Revised: 05/22/2024] [Indexed: 06/21/2024]
Abstract
To elucidate the brain-wide information interactions that vary and contribute to individual differences in schizophrenia (SCZ), an information-resolved method is employed to construct individual synergistic and redundant interaction matrices based on regional pairwise BOLD time-series from 538 SCZ and 540 normal controls (NC). This analysis reveals a stable pattern of regionally-specific synergy dysfunction in SCZ. Furthermore, a hierarchical Bayesian model is applied to deconstruct the patterns of whole-brain synergy dysfunction into three latent factors that explain symptom heterogeneity in SCZ. Factor 1 exhibits a significant positive correlation with Positive and Negative Syndrome Scale (PANSS) positive scores, while factor 3 demonstrates significant negative correlations with PANSS negative and general scores. By integrating the neuroimaging data with normative gene expression information, this study identifies that each of these three factors corresponded to a subset of the SCZ risk gene set. Finally, by combining data from NeuroSynth and open molecular imaging sources, along with a spatially heterogeneous mean-field model, this study delineates three SCZ synergy factors corresponding to distinct symptom profiles and implicating unique cognitive, neurodynamic, and neurobiological mechanisms.
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Affiliation(s)
- Chaoyue Ding
- School of Artificial Intelligence, University of Chinese Academy of Sciences, Beijing, 100049, China
- Brainnetome Center, Institute of Automation, Chinese Academy of Sciences, Beijing, 100190, China
| | - Ang Li
- State Key Laboratory of Brain and Cognitive Science, Institute of Biophysics, Chinese Academy of Sciences, Beijing, 100101, China
| | - Sangma Xie
- School of Automation, Hangzhou Dianzi University, Hangzhou, 310018, China
| | - Xiaohan Tian
- State Key Laboratory of Cognitive Neuroscience and Learning, Beijing Normal University, Beijing, 100875, China
| | - Kunchi Li
- Brainnetome Center, Institute of Automation, Chinese Academy of Sciences, Beijing, 100190, China
| | - Lingzhong Fan
- Brainnetome Center, Institute of Automation, Chinese Academy of Sciences, Beijing, 100190, China
| | - Hao Yan
- Institute of Mental Health, Peking University Sixth Hospital, Beijing, 100191, China
| | - Jun Chen
- Department of Radiology, Renmin Hospital of Wuhan University, Wuhan, 430060, China
| | - Yunchun Chen
- Department of Psychiatry, Xijing Hospital, The Fourth Military Medical University, Xi'an, 710032, China
| | - Huaning Wang
- Department of Psychiatry, Xijing Hospital, The Fourth Military Medical University, Xi'an, 710032, China
| | - Hua Guo
- Zhumadian Psychiatric Hospital, Zhumadian, 463000, China
| | - Yongfeng Yang
- Department of Psychiatry, Henan Mental Hospital, The Second Affiliated Hospital of Xinxiang Medical University, Xinxiang, 453002, China
| | - Luxian Lv
- Department of Psychiatry, Henan Mental Hospital, The Second Affiliated Hospital of Xinxiang Medical University, Xinxiang, 453002, China
| | - Huiling Wang
- Department of Psychiatry, Renmin Hospital of Wuhan University, Wuhan, 430060, China
| | - Hongxing Zhang
- Department of Psychiatry, Henan Mental Hospital, The Second Affiliated Hospital of Xinxiang Medical University, Xinxiang, 453002, China
| | - Lin Lu
- Institute of Mental Health, Peking University Sixth Hospital, Beijing, 100191, China
| | - Dai Zhang
- Institute of Mental Health, Peking University Sixth Hospital, Beijing, 100191, China
| | - Zhanjun Zhang
- State Key Laboratory of Cognitive Neuroscience and Learning, Beijing Normal University, Beijing, 100875, China
| | - Meng Wang
- State Key Laboratory of Cognitive Neuroscience and Learning, Beijing Normal University, Beijing, 100875, China
| | - Tianzi Jiang
- School of Artificial Intelligence, University of Chinese Academy of Sciences, Beijing, 100049, China
- Brainnetome Center, Institute of Automation, Chinese Academy of Sciences, Beijing, 100190, China
| | - Bing Liu
- State Key Laboratory of Cognitive Neuroscience and Learning, Beijing Normal University, Beijing, 100875, China
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Zhong J, Jia Y, Zhu H, Wang D, Jia H. Effects of Ziprasidone or Haloperidol on Theory of Mind in Patients With Schizophrenia: A 16-week Pilot Trial. J Psychiatr Pract 2024; 30:32-42. [PMID: 38227725 DOI: 10.1097/pra.0000000000000752] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/18/2024]
Abstract
OBJECTIVES Schizophrenia is associated with impairment in theory of mind (ToM), which is defined as the ability to make judgments about mental states and is related to medial prefrontal cortical activity. Ziprasidone, but not haloperidol, is known to have a protective effect in the medial prefrontal cortex. Thus, we hypothesized that these 2 drugs would have different efficacy in improving ToM task performance in patients with schizophrenia. METHODS Patients with a Diagnostic and Statistical Manual of Mental Disorders, Fourth Edition (DSM-IV) diagnosis of schizophrenia matched for sex, duration of illness, and education were randomized to receive ziprasidone (n=30) or haloperidol (n=30). All patients were assessed using the Positive and Negative Syndrome Scale and the Personal and Social Functioning Scale. ToM was assessed using a first-order false belief task, a second-order false belief task, the faux-pas task, and the Reading the Mind in the Eyes Task, in order of developmental complexity and difficulty. The primary outcome was change in ToM performance from baseline to 16 weeks of treatment. RESULTS For the first-order false belief task, there were no significant differences between the groups (P>0.05). For the second-order false belief task, the interaction effect was significant (P<0.05), and the simple effect of time showed a significant difference only in the ziprasidone group (P<0.001). For the faux-pas task, the interaction effect was not significant (P>0.05). For the Reading the Mind in the Eyes Task, the interaction effect was significant (P<0.05), and the simple effect of time showed a significant difference only in the ziprasidone group (P<0.001). The Positive and Negative Syndrome Scale results were similar between the groups. The ziprasidone group performed better than the haloperidol group on the Personal and Social Functioning Scale. There were no major safety concerns or adverse events. CONCLUSIONS The findings of this study suggest that ziprasidone could improve ToM and might be superior to haloperidol for improving complex ToM as well as personal and social functioning in patients with schizophrenia. TRIAL REGISTRATION CHINESE CLINICAL TRIAL REGISTER ChiCTR2200060542.
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Affiliation(s)
- Jie Zhong
- ZHONG, JIA, ZHU, and JIA: The National Clinical Research Center for Mental Disorders & Beijing Key Laboratory of Mental Disorders, Beijing Anding Hospital, Capital Medical University, and Advanced Innovation Center for Human Brain Protection, Capital Medical University, Beijing, People's Republic of China; WANG: Inner Mongolia Autonomous Region Mental Health Center, Hohhot, Inner Mongolia, People's Republic of China
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Wu Y, Song S, Shen Y. Characteristics of theory of mind impairment and its relationship with clinical symptoms and neurocognition in patients with schizophrenia. BMC Psychiatry 2023; 23:711. [PMID: 37784072 PMCID: PMC10544361 DOI: 10.1186/s12888-023-05224-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/03/2023] [Accepted: 09/26/2023] [Indexed: 10/04/2023] Open
Abstract
BACKGROUND Schizophrenia (SCZ) is a mental disorder that can cause severe disability, including impairment of social cognition, which is considered a core feature of SCZ, and the Theory of Mind (ToM) is a core component of social cognition. Although many studies have confirmed the presence of ToM impairment in patients with SCZ, its characteristics in terms of different orders (first-order and second-order) and components remain unclear, and no studies have investigated the independent correlations between such impairment and clinical symptoms. Therefore, this study aimed to identify the characteristics of ToM impairment in patients with SCZ. METHODS This study included 30 patients with SCZ and 30 healthy controls who were matched for age, sex, and level of education. The clinical symptoms of the patients with SCZ were evaluated using the Positive and Negative Symptom Scale (PANSS), and the neurocognitive ability of the subjects was evaluated using the Trail Making Test, Symbol Coding Test, and Digit Span Test. The degree of ToM impairment of the subjects at different stages (first- and second-order) and for individual components was evaluated using the Yoni task. Latent profile analysis and network analysis were conducted to identify and analyze the potential ToM performance types, and independent correlations were assessed between ToM impairment and clinical symptoms. RESULTS The patients with SCZ exhibited significant first-order and second-order impairment (P < 0.05), and the second-order affective ToM component was mainly reflected by complex affective states (P = 0.003). The latent profile analysis revealed that ToM impairments in patients with SCZ could be classified into groups with complete, second-order, and comprehensive defects, whereas it was impossible to classify patients according to differences in the cognitive and affective ToM components. The Network analysis demonstrated that the cognitive component of ToM was associated with positive symptoms, whereas the affective ToM component was associated with negative symptoms. CONCLUSION Patients with SCZ exhibited differences in order levels and ToM impairments, as well as different defect types. In addition, cognitive and affective ToM components may be related to different psychotic symptoms; therefore, understanding these differences could promote the rehabilitation of patients with SCZ.
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Affiliation(s)
- Ying Wu
- School of Humanities and Social Sciences, Shanxi Medical University, No. 56 South Xinjian Road, Taiyuan, 030001, China.
| | - Song Song
- School of Humanities and Social Sciences, Shanxi Medical University, No. 56 South Xinjian Road, Taiyuan, 030001, China
| | - Yueqi Shen
- School of Humanities and Social Sciences, Shanxi Medical University, No. 56 South Xinjian Road, Taiyuan, 030001, China
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Temporal self and reflected appraisals in euthymic and depressed individuals. J Affect Disord 2023; 327:340-347. [PMID: 36773762 DOI: 10.1016/j.jad.2023.02.022] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/10/2021] [Revised: 02/01/2023] [Accepted: 02/04/2023] [Indexed: 02/11/2023]
Abstract
BACKGROUND Temporal self-appraisal (TSA) theory, reflected appraisal theory, and their clinical applications have previously been explored as independent constructs. This study investigates how TSA corresponds to temporal reflected appraisal (TRA), and how the relationship between them differs in the presence of depression. METHODS 273 adults (57 % female), recruited using Amazon Mechanical Turk, filled out a series of measures of mood and self-appraisal assessments (TSA and TRA versions of the Me/Not Me task). Repeated measures MANOVAs were used to assess between group differences. RESULTS The TSA trajectory of depressed individuals replicated the 'V' shape found in previous research, whereas the TRA of depressed individuals did not decline from past to present. There was little difference between TSA and TRA "past" and "future" appraisals, though there was a significant difference in appraisal of the "present." Individuals with depression believe that others perceive them as doing much better currently than the way they view themselves. By contrast, euthymic individuals had no significant differences between the TSA and TRA appraisals of their present selves, indicating they think their self-perception matches how others view them. LIMITATIONS We assessed depression using online self-reports. Cross-sectional data limits causality determination but suffices for studying mood-related self-perceptions over time. CONCLUSIONS Temporal self-appraisal and temporal reflected appraisal have varying relationships among euthymic and depressed individuals. This more precise characterization of depressed individuals' identity can further aid clinicians in understanding the nature of identity development and treating identity disruption among depressed individuals.
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Thibaudeau E, Rae J, Raucher-Chéné D, Bougeard A, Lepage M. Disentangling the Relationships Between the Clinical Symptoms of Schizophrenia Spectrum Disorders and Theory of Mind: A Meta-analysis. Schizophr Bull 2023; 49:255-274. [PMID: 36244001 PMCID: PMC10016420 DOI: 10.1093/schbul/sbac150] [Citation(s) in RCA: 10] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
BACKGROUND AND HYPOTHESIS Previous studies have suggested links between clinical symptoms and theory of mind (ToM) impairments in schizophrenia spectrum disorders (SSD), but it remains unclear whether some symptoms are more strongly linked to ToM than others. STUDY DESIGN A meta-analysis (Prospero; CRD42021259723) was conducted to quantify and compare the strength of the associations between ToM and the clinical symptoms of SSD (Positive, Negative, Cognitive/Disorganization, Depression/Anxiety, Excitability/Hostility). Studies (N = 130, 137 samples) including people with SSD and reporting a correlation between clinical symptoms and ToM were retrieved from Pubmed, PsycNet, Embase, Cochrane Library, Science Direct, Proquest, WorldCat, and Open Gray. Correlations for each dimension and each symptom were entered into a random-effect model using a Fisher's r-to-z transformation and were compared using focused-tests. Publication bias was assessed with the Rosenthal failsafe and by inspecting the funnel plot and the standardized residual histogram. STUDY RESULTS The Cognitive/Disorganization (Zr = 0.28) and Negative (Zr = 0.24) dimensions revealed a small to moderate association with ToM, which was significantly stronger than the other dimensions. Within the Cognitive/Disorganization dimension, Difficulty in abstract thinking (Zr = 0.36) and Conceptual disorganization (Zr = 0.39) showed the strongest associations with ToM. The association with the Positive dimension (Zr = 0.16) was small and significantly stronger than the relationship with Depression/Anxiety (Zr = 0.09). Stronger associations were observed between ToM and clinical symptoms in younger patients, those with an earlier age at onset of illness and for tasks assessing a combination of different mental states. CONCLUSIONS The relationships between Cognitive/Disorganization, Negative symptoms, and ToM should be considered in treating individuals with SSD.
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Affiliation(s)
- Elisabeth Thibaudeau
- McGill University, Department of Psychiatry, Montreal, Canada
- Douglas Research Centre, Montreal, Canada
| | - Jesse Rae
- Douglas Research Centre, Montreal, Canada
- McGill University, Department of Psychology, Montreal, Canada
| | - Delphine Raucher-Chéné
- McGill University, Department of Psychiatry, Montreal, Canada
- Douglas Research Centre, Montreal, Canada
- Cognition, Health, and Society Laboratory (EA 6291), University of Reims Champagne-Ardenne, Reims, France
- Academic Department of Psychiatry, University Hospital of Reims, EPSM Marne, Reims, France
| | | | - Martin Lepage
- McGill University, Department of Psychiatry, Montreal, Canada
- Douglas Research Centre, Montreal, Canada
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Jarsch M, Piguet O, Berres M, Sluka C, Semenkova A, Kressig RW, Monsch AU, McDonald S, Sollberger M. Development of the Basel Version of the Awareness of Social Inference Test - Theory of Mind (BASIT-ToM) in healthy adults. J Neuropsychol 2023; 17:125-145. [PMID: 36129703 PMCID: PMC10947008 DOI: 10.1111/jnp.12290] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2021] [Accepted: 08/13/2022] [Indexed: 11/27/2022]
Abstract
Impairments of Theory of Mind (ToM) abilities occur in a wide range of brain disorders. Therefore, reliable and ecologically valid examination of these abilities is a crucial part of any comprehensive neuropsychological assessment. An established and ecologically valid, English-language test identifying deficits in ToM abilities is "The Awareness of Social Inference Test - Social Inference Minimal (TASIT-SIM)". However, no comparable German-language ToM test currently exists. In this study, we aimed to develop the first German-language adaption of TASIT-SIM in healthy adults. We selected 13 scenes [four scenes per message type (i.e., honesty, simple sarcasm, paradoxical sarcasm) and one practice scene] out of the 30 TASIT-SIM scenes. In collaboration with a film institute, we filmed each scene at three different intensities. These intensity version scenes were then administered to 240 healthy adults, equally distributed in sex and age, ranging from 35 to 92 years. By applying Rasch analysis, we selected intensity versions that showed neither floor nor ceiling effects in the majority of ToM questions in participants whose ToM abilities were in the medium range. In conclusion, we have developed the first German-language adaption of TASIT-SIM, i.e., the "Basel Version of the Awareness of Social Inference Test - Theory of Mind (BASIT-ToM)". The BASIT-ToM incorporates the strengths of TASIT-SIM, while overcoming its limitations such as inconsistencies in cinematic realization and ceiling effects in healthy participants. Next, the BASIT-ToM needs to be validated in healthy people and clinical populations.
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Affiliation(s)
- Marianne Jarsch
- Memory ClinicUniversity Department of Geriatric Medicine Felix PlatterBaselSwitzerland
- Faculty of PsychologyUniversity of BaselBaselSwitzerland
| | - Olivier Piguet
- School of Psychology and Brain and Mind CentreThe University of SydneySydneyNew South WalesAustralia
| | - Manfred Berres
- Faculty of Mathematics and TechnologyUniversity of Applied Sciences KoblenzKoblenzGermany
| | - Constantin Sluka
- Department of Clinical ResearchUniversity of Basel and University Hospital BaselBaselSwitzerland
| | - Anna Semenkova
- Memory ClinicUniversity Department of Geriatric Medicine Felix PlatterBaselSwitzerland
- Faculty of PsychologyUniversity of BaselBaselSwitzerland
| | - Reto W. Kressig
- Memory ClinicUniversity Department of Geriatric Medicine Felix PlatterBaselSwitzerland
| | - Andreas U. Monsch
- Memory ClinicUniversity Department of Geriatric Medicine Felix PlatterBaselSwitzerland
- Faculty of PsychologyUniversity of BaselBaselSwitzerland
| | - Skye McDonald
- University of New South Wales PsychologySydneyNew South WalesAustralia
| | - Marc Sollberger
- Memory ClinicUniversity Department of Geriatric Medicine Felix PlatterBaselSwitzerland
- Department of NeurologyUniversity Hospital Basel and University of BaselBaselSwitzerland
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Yeh YC, Hung CF, Lin CY, Wu YY, Kuo CH, Potenza MN, Cheng CH, Chen KL. The animated assessment of theory of mind for people with schizophrenia (AToMS): development and psychometric evaluation. Eur Arch Psychiatry Clin Neurosci 2022; 273:663-677. [PMID: 36253583 DOI: 10.1007/s00406-022-01498-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/12/2022] [Accepted: 09/27/2022] [Indexed: 11/24/2022]
Abstract
Theory of mind (ToM) deficits in people with schizophrenia have been reported and associated with impaired social interactions. Thus, ToM deficits may negatively impact social functioning and warrant consideration in treatment development. However, extant ToM measures may place excessive cognitive demands on people with schizophrenia. Therefore, the study aimed to develop a comprehensible Assessment of ToM for people with Schizophrenia (AToMS) and evaluate its psychometric properties. The AToMs was developed in 5 stages, including item formation, expert review, content validity evaluation, animation production, and cognitive interviews of 25 people with schizophrenia. The psychometric properties of the 16-item AToMS (including reliability and validity) were then tested on 59 people with schizophrenia. The newly developed animated AToMS assesses 8 ToM concepts in the cognitive and affective dimensions while placing minimal neurocognitive demands on people with schizophrenia. The AToMS presented satisfactory psychometric properties, with adequate content validity (content validity index = 0.91); mostly moderate item difficulty (item difficulty index = 0.339-0.966); good discrimination (coefficients = 0.379-0.786), internal consistency (Cronbach's α = 0.850), and reliability (intraclass correlation coefficient = 0.901 for test-retest, 0.997 for inter-rater); and satisfactory convergent and divergent validity. The AToMS is reliable and valid for evaluating ToM characteristics in people with schizophrenia. Future studies are warranted to examine the AToMS in other populations (e.g., people with affective disorders) to cross-validate and extend its utility and psychometric evidence.
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Affiliation(s)
- Ya-Chin Yeh
- Department of Occupational Therapy, Shu-Zen Junior College of Medicine and Management, Kaohsiung, 821004, Taiwan
| | - Chi-Fa Hung
- School of Medicine, College of Medicine, National Sun Yat-sen University, Kaohsiung, 804201, Taiwan.,Department of Psychiatry, Kaohsiung Chang Gung Memorial Hospital and Chang Gung University College of Medicine, Kaohsiung, 833401, Taiwan.,College of Humanities and Social Sciences, National Pingtung University of Science and Technology, 912301, Pingtung, Taiwan
| | - Chung-Ying Lin
- Institute of Allied Health Sciences, College of Medicine, National Cheng Kung University, Tainan, 701401, Taiwan. .,Department of Occupational Therapy, College of Medicine, National Cheng Kung University, Tainan, 701401, Taiwan. .,Department of Public Health, College of Medicine, National Cheng Kung University, Tainan, 701401, Taiwan. .,Biostatistics Consulting Center, National Cheng Kung University Hospital, College of Medicine, National Cheng Kung University, Tainan, 701401, Taiwan.
| | - Yuh-Yih Wu
- Department of Special Education, National Kaohsiung Normal University, Kaohsiung, 802561, Taiwan
| | - Chun-Hong Kuo
- Department of Academic Office, Kaohsiung Municipal Nan-Zih Special School, Kaohsiung, 811214, Taiwan
| | - Marc N Potenza
- Department of Psychiatry, Yale School of Medicine, New Haven, CT, USA.,Connecticut Mental Health Center, New Haven, CT, USA.,Connecticut Council on Problem Gambling, Wethersfield, CT, USA.,Child Study Center, Yale School of Medicine, New Haven, CT, USA.,Department of Neuroscience, Yale University, New Haven, CT, USA.,Wu Tsai Institute, Yale University, New Haven, CT, USA
| | - Chun-Hua Cheng
- Department of Occupational Therapy, Kaohsiung Municipal Kai-Syuan Psychiatric Hospital, Kaohsiung, 802211, Taiwan
| | - Kuan-Lin Chen
- Institute of Allied Health Sciences, College of Medicine, National Cheng Kung University, Tainan, 701401, Taiwan. .,Department of Occupational Therapy, College of Medicine, National Cheng Kung University, Tainan, 701401, Taiwan. .,Department of Physical Medicine and Rehabilitation, College of Medicine, National Cheng Kung University Hospital, National Cheng Kung University, Tainan, 701401, Taiwan.
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Lai S, Zhong S, Wang Y, Zhang Y, Xue Y, Zhao H, Ran H, Yan S, Luo Y, He J, Zhu Y, Lv S, Song Z, Miao H, Hu Y, Huang X, Lu X, Zhou J, Jia Y. The prevalence and characteristics of MCCB cognitive impairment in unmedicated patients with bipolar II depression and major depressive disorder. J Affect Disord 2022; 310:369-376. [PMID: 35504401 DOI: 10.1016/j.jad.2022.04.153] [Citation(s) in RCA: 13] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/20/2021] [Revised: 03/16/2022] [Accepted: 04/26/2022] [Indexed: 01/10/2023]
Abstract
BACKGROUND Cognitive impairment has been acknowledged as a core clinical manifestation of bipolar disorder (BD) as well as major depressive disorder (MDD). Determining the prevalence and characteristics of cognitive impairment is important for clinical interventions. This study investigated the prevalence and characteristics of cognitive impairment based on the Measurement and Treatment Research to Improve Cognition Schizophrenia Consensus Cognitive Battery (MCCB) in both BD and MDD. METHOD One hundred and forty-nine BD II depression, 147 MDD, and 124 demographically matched healthy controls (HC) underwent MCCB cognitive assessment. The prevalence of MCCB cognitive impairment and group difference comparisons were performed. Additionally, association analysis was performed to investigate the relationship between cognitive performance and clinical variables. RESULTS Compared to the HC group, both BD II depression and MDD groups had a significantly reduced performance for all MCCB cognitive domains (all p < 0.05). The numerical scores for visual learning were lower in the BD II depression group compared to the MDD group. 32.89% of the BD II depression patients had clinically significant impairment (>1.5 SD below the normal mean) in two or more MCCB domains compared to 23.13% for MDD patients. CONCLUSIONS A high percent of patients in the BD II depression and MDD group exhibited MCCB cognitive impairments with clinical significance. Cognitive impairments were more common in BD II depression patients compared to MDD patients, particularly for visual learning. These findings suggest that clinicians should be aware of the severe cognitive impairment in mood disorders and establish effective cognitive screening and intervention strategies.
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Affiliation(s)
- Shunkai Lai
- Department of Psychiatry, First Affiliated Hospital of Jinan University, Guangzhou 510630, China; Medical Imaging Center, First Affiliated Hospital of Jinan University, Guangzhou 510630, China
| | - Shuming Zhong
- Department of Psychiatry, First Affiliated Hospital of Jinan University, Guangzhou 510630, China
| | - Ying Wang
- Medical Imaging Center, First Affiliated Hospital of Jinan University, Guangzhou 510630, China
| | - Yiliang Zhang
- Department of Psychiatry, First Affiliated Hospital of Jinan University, Guangzhou 510630, China
| | - Ying Xue
- Department of Psychiatry, First Affiliated Hospital of Jinan University, Guangzhou 510630, China
| | - Hui Zhao
- Department of Psychiatry, First Affiliated Hospital of Jinan University, Guangzhou 510630, China
| | - Hanglin Ran
- School of Management, Jinan University, Guangzhou 510316, China
| | - Shuya Yan
- School of Management, Jinan University, Guangzhou 510316, China
| | - Yange Luo
- School of Management, Jinan University, Guangzhou 510316, China
| | - Jiali He
- Department of Psychiatry, First Affiliated Hospital of Jinan University, Guangzhou 510630, China
| | - Yunxia Zhu
- Department of Psychiatry, First Affiliated Hospital of Jinan University, Guangzhou 510630, China
| | - Sihui Lv
- School of Management, Jinan University, Guangzhou 510316, China
| | - Zijing Song
- School of Management, Jinan University, Guangzhou 510316, China
| | - Haofei Miao
- School of Management, Jinan University, Guangzhou 510316, China
| | - Yilei Hu
- School of Management, Jinan University, Guangzhou 510316, China
| | - Xiaosi Huang
- Department of Psychiatry, First Affiliated Hospital of Jinan University, Guangzhou 510630, China
| | - Xiaodan Lu
- Department of Psychiatry, First Affiliated Hospital of Jinan University, Guangzhou 510630, China
| | - Jiansong Zhou
- Department of Psychiatry, and National Clinical Research Center for Mental Disorders, The Second Xiangya Hospital of Central South University, Changsha 410011, Hunan, China.
| | - Yanbin Jia
- Department of Psychiatry, First Affiliated Hospital of Jinan University, Guangzhou 510630, China.
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10
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Current understanding of developmental changes in adolescent perspective taking. Curr Opin Psychol 2022; 45:101308. [DOI: 10.1016/j.copsyc.2022.101308] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2021] [Revised: 01/24/2022] [Accepted: 02/04/2022] [Indexed: 11/20/2022]
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11
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Pagnoni I, Gobbi E, Alaimo C, Campana E, Rossi R, Manenti R, Balconi M, Cotelli M. The relationship between theory of mind and executive functions in major depressive disorders: A review. Front Psychiatry 2022; 13:980392. [PMID: 36051550 PMCID: PMC9424552 DOI: 10.3389/fpsyt.2022.980392] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/28/2022] [Accepted: 07/25/2022] [Indexed: 11/13/2022] Open
Abstract
Patients suffering from major depressive disorder (MDD) experience difficulties in multiple cognitive and affective abilities. A large body of literature has argued that MDD patients show impaired executive functions (EFs) and deficits in theory of mind (ToM), the ability to infer the mental states of others. However, the relationship between ToM and EFs has been poorly investigated. The aim of this review is to provide an overview of studies that evaluated the association between ToM and EFs in patients with MDD diagnosis. A literature review was conducted to identify all published studies in which ToM and EFs measures were administered to individuals with MDD and in which the relationship between these two domains was investigated. Eleven studies were included, and for each study, we discussed the findings related to ToM, EFs, and the nature of the link between these two aspects. Most of the studies reported that patients with MDD, compared with healthy controls, showed significant impairments in both ToM and EFs abilities. Moreover, this review indicates the presence of a significant association between these two domains in MDD patients, supporting the evidences that executive functioning is important to perform ToM tasks. Although the results that emerged are interesting, the relationship between ToM and EFs in MDD needs further investigation.
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Affiliation(s)
- Ilaria Pagnoni
- Neuropsychology Unit, IRCCS Istituto Centro San Giovanni di Dio Fatebenefratelli, Brescia, Italy
| | - Elena Gobbi
- Neuropsychology Unit, IRCCS Istituto Centro San Giovanni di Dio Fatebenefratelli, Brescia, Italy
| | - Cristina Alaimo
- Neuropsychology Unit, IRCCS Istituto Centro San Giovanni di Dio Fatebenefratelli, Brescia, Italy
| | - Elena Campana
- Neuropsychology Unit, IRCCS Istituto Centro San Giovanni di Dio Fatebenefratelli, Brescia, Italy
| | - Roberta Rossi
- Unit of Psychiatry, IRCCS Istituto Centro San Giovanni di Dio Fatebenefratelli, Brescia, Italy
| | - Rosa Manenti
- Neuropsychology Unit, IRCCS Istituto Centro San Giovanni di Dio Fatebenefratelli, Brescia, Italy
| | - Michela Balconi
- International Research Center for Cognitive Applied Neuroscience (IrcCAN), Catholic University of the Sacred Heart, Milan, Italy.,Research Unit in Affective and Social Neuroscience, Department of Psychology, Catholic University of the Sacred Heart, Milan, Italy
| | - Maria Cotelli
- Neuropsychology Unit, IRCCS Istituto Centro San Giovanni di Dio Fatebenefratelli, Brescia, Italy
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12
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Group and sex differences in social cognition in bipolar disorder, schizophrenia/schizoaffective disorder and healthy people. Compr Psychiatry 2021; 109:152258. [PMID: 34252633 DOI: 10.1016/j.comppsych.2021.152258] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/31/2020] [Revised: 06/11/2021] [Accepted: 06/21/2021] [Indexed: 12/30/2022] Open
Abstract
BACKGROUND Impairment of social cognition is documented in bipolar disorder (BD) and schizophrenia/schizoaffective disorder (SCH). In healthy individuals, women perform better than men in some of its sub-domains. However, in BD and SCH the results are mixed. Our aim was to compare emotion recognition, affective Theory of Mind (ToM) and first- and second-order cognitive ToM in BD, SCH and healthy subjects, and to investigate sex-related differences. METHODS 120 patients (BD = 60, SCH = 60) and 40 healthy subjects were recruited. Emotion recognition was assessed by the Pictures of Facial Affect (POFA) test, affective ToM by the Reading the Mind in the Eyes Test (RMET) and cognitive ToM by several false-belief stories. Group and sex differences were analyzed using parametric (POFA, RMET) and non-parametric (false-belief stories) tests. The impact of age, intelligence quotient (IQ) and clinical variables on patient performance was examined using a series of linear/logistic regressions. RESULTS Both groups of patients performed worse than healthy subjects on POFA, RMET and second-order false-belief (p < 0.001), but no differences were found between them. Instead, their deficits were related to older age and/or lower IQ (p < 0.01). Subthreshold depression was associated with a 6-fold increased risk of first-order false-belief failure (p < 0.001). Sex differences were only found in healthy subjects, with women outperforming men on POFA and RMET (p ≤ 0.012), but not on first/second-order false-belief. LIMITATIONS The cross-sectional design does not allow for causal inferences. CONCLUSION BD and SCH patients had deficits in emotion recognition, affective ToM, and second-order cognitive ToM, but their performance was comparable to each other, highlighting that the differences between them may be subtler than previously thought. First-order cognitive ToM remained intact, but subthreshold depression altered their normal functioning. Our results suggest that the advantage of healthy women in the emotional and affective aspects of social cognition would not be maintained in BD and SCH.
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13
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Lemvigh CK, Karantonis JA, Furlong LS, Carruthers SP, Pantelis C, Rossell SL, Van Rheenen TE. Characterization and interrelationships of theory of mind, socially competitive emotions and affective empathy in bipolar disorder. BRITISH JOURNAL OF CLINICAL PSYCHOLOGY 2021; 61:76-92. [PMID: 34232514 DOI: 10.1111/bjc.12318] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2021] [Revised: 06/22/2021] [Indexed: 11/28/2022]
Abstract
OBJECTIVE Evidence shows impaired theory of mind (ToM) in patients with bipolar disorder (BD), yet research examining its cognitive and affective components simultaneously is sparse. Moreover, recognition of socially competitive 'fortune of others' emotions (e.g. envy/gloat) may be related to ToM, but has not been assessed in BD. Finally, if and how ToM and 'fortune of others' emotions relate to affective empathy in BD is currently unclear. This study aimed to address these points. METHODS 64 BD patients and 34 healthy controls completed the Yoni task, a visual task assessing first- and second-order cognitive and affective ToM as well as 'fortune of others' emotions. The Toronto Empathy Questionnaire was used to assess self-reported affective empathy. RESULTS Patients with BD showed no deficits in cognitive and affective ToM or recognition of 'fortune of others' emotions. The ability to infer 'fortune of others' emotions correlated with several ToM measures, indicating that these functions are part of the same system. Patients with BD reported similar levels of affective empathy to healthy controls, and this was not related to ToM or 'fortune of others' emotions, suggesting that affective empathy represents a separate social domain. CONCLUSIONS These findings highlight areas of spared social functioning in BD, which may be utilized in therapeutic strategies. PRACTITIONER POINTS Our results suggest theory of mind and empathy may represent areas of potentially spared cognitive functioning in BD. As many BD patients have experienced adversity during developmental periods in which theory of mind and empathy develop, our findings suggest that these abilities may be markers of resilience in the disorder. Our findings are important for the formulation of therapeutic interventions for BD, which may include considering practical ways that a patients' knowledge of intact ToM and empathy could be utilized to reduce self-stigma and promote self-efficacy, improved well-being and functioning.
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Affiliation(s)
- Cecilie K Lemvigh
- Center for Clinical Intervention and Neuropsychiatric Schizophrenia Research (CINS) and Center for Neuropsychiatric Schizophrenia Research (CNSR), Mental Health Center Glostrup, Glostrup, Denmark.,Department of Psychology, Faculty of Social Sciences, University of Copenhagen, Copenhagen, Denmark.,Melbourne Neuropsychiatry Centre, Department of Psychiatry, University of Melbourne and Melbourne Health, Carlton, Victoria, Australia
| | - James A Karantonis
- Melbourne Neuropsychiatry Centre, Department of Psychiatry, University of Melbourne and Melbourne Health, Carlton, Victoria, Australia.,Faculty of Health, Arts and Design, Centre for Mental Health, Swinburne University of Technology, Melbourne, Victoria, Australia
| | - Lisa S Furlong
- Melbourne Neuropsychiatry Centre, Department of Psychiatry, University of Melbourne and Melbourne Health, Carlton, Victoria, Australia
| | - Sean P Carruthers
- Faculty of Health, Arts and Design, Centre for Mental Health, Swinburne University of Technology, Melbourne, Victoria, Australia
| | - Christos Pantelis
- Center for Clinical Intervention and Neuropsychiatric Schizophrenia Research (CINS) and Center for Neuropsychiatric Schizophrenia Research (CNSR), Mental Health Center Glostrup, Glostrup, Denmark.,Melbourne Neuropsychiatry Centre, Department of Psychiatry, University of Melbourne and Melbourne Health, Carlton, Victoria, Australia.,Florey Institute of Neuroscience and Mental Health, Melbourne, Victoria, Australia
| | - Susan L Rossell
- Faculty of Health, Arts and Design, Centre for Mental Health, Swinburne University of Technology, Melbourne, Victoria, Australia.,Department of Psychiatry, St Vincent's Hospital, Melbourne, Victoria, Australia
| | - Tamsyn E Van Rheenen
- Melbourne Neuropsychiatry Centre, Department of Psychiatry, University of Melbourne and Melbourne Health, Carlton, Victoria, Australia.,Faculty of Health, Arts and Design, Centre for Mental Health, Swinburne University of Technology, Melbourne, Victoria, Australia
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14
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A Systematic Review of the Current Measures of Theory of Mind in Adults with Schizophrenia. INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH 2021; 18:ijerph18137172. [PMID: 34281109 PMCID: PMC8297277 DOI: 10.3390/ijerph18137172] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/27/2021] [Revised: 06/17/2021] [Accepted: 06/29/2021] [Indexed: 12/19/2022]
Abstract
Adults with schizophrenia usually have impairments in theory of mind (ToM), which subsequently cause them problems in social interaction. Therefore, it is important for healthcare providers to assess their ToM using adequate measures. This systematic review evaluated current ToM measures (or ToM tasks) for adults with schizophrenia and summarized their specific characteristics, including the concept and construct, administration, and psychometric properties. From a review of 117 articles, 13 types of ToM tasks were identified, and the findings from these articles were qualitatively synthesized. The results showed that ToM tasks are diverse in their presentation modalities, answer modes, strategies of controlling cognitive confounders, and scoring. Most tasks employ cognitive and affective dimensions and target a specific, single ToM concept. The present systematic review found that psychometric evidence supporting the ToM tasks, such as internal consistency, test–retest reliability, unidimensionality, and convergent, criterion, and ecological validities, is insufficient. Based on the results, we propose several principles for selecting appropriate ToM tasks in practice, e.g., selecting a task with multiple ToM concepts, or an exclusive ToM construct containing the cognitive and affective dimensions. Moreover, future studies are needed to provide more psychometric evidence on each type of ToM task applied in people with schizophrenia.
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15
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Altschuler MR, Trevisan DA, Wolf JM, Naples AJ, Foss-Feig JH, Srihari VH, McPartland JC. Face perception predicts affective theory of mind in autism spectrum disorder but not schizophrenia or typical development. JOURNAL OF ABNORMAL PSYCHOLOGY 2021; 130:413-422. [PMID: 34180705 PMCID: PMC8244155 DOI: 10.1037/abn0000621] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
Autism spectrum disorder (ASD) and schizophrenia spectrum disorder (SCZ) have overlapping symptomatology related to difficulties with social cognition. Yet, few studies have directly compared social cognition in ASD, SCZ, and typical development (TD). The current study examined individual differences in face recognition and its relation to affective theory of mind (ToM) in each diagnostic group. Adults with ASD (n = 31), SCZ (n = 43), and TD (n = 47) between the ages of 18 and 48 years-old with full scale IQ above 80 participated in this study. The Reading the Mind in the Eyes Test (RMET) measured affective ToM, and the Benton Facial Recognition Test (BFRT) measured face perception. Adults with ASD and SCZ did not differ in their affective ToM abilities, and both groups showed affective ToM difficulties compared with TD. However, better face recognition ability uniquely predicted better affective ToM ability in ASD. Results suggest that affective ToM difficulties may relate to face processing in ASD but not SCZ. By clarifying the complex nature of individual differences in affective ToM and face recognition difficulties in these disorders, the present study suggests there may be divergent mechanisms underlying pathways to social dysfunction in ASD compared with SCZ. (PsycInfo Database Record (c) 2021 APA, all rights reserved).
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Affiliation(s)
| | | | | | | | | | - Vinod H Srihari
- Department of Psychiatry, Yale University School of Medicine
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16
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Mazza M, Pino MC, Keller R, Vagnetti R, Attanasio M, Filocamo A, Le Donne I, Masedu F, Valenti M. Qualitative Differences in Attribution of Mental States to Other People in Autism and Schizophrenia: What are the Tools for Differential Diagnosis? J Autism Dev Disord 2021; 52:1283-1298. [PMID: 33909212 PMCID: PMC8854268 DOI: 10.1007/s10803-021-05035-3] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 04/18/2021] [Indexed: 11/26/2022]
Abstract
The differential diagnosis between schizophrenia spectrum disorders (SSD) and autism spectrum disorders (ASD) remains an important clinical question, because they have overlap in clinical diagnosis. This study explored the differences between ASD (n = 44) and SSD patients (n = 59), compared to typically developing peers (n = 63), in completing an advanced Theory of Mind (ToM) task. The outcome found several differences between groups. The SSD patients showed greater difficulty in understanding social scenarios, while ASD individuals understood the stories, but did not correctly identify the protagonist’s intention. The interesting aspect of the results is that some ToM stories are more informative about the mentalistic reasoning of the two clinical groups, namely, the stories that investigate pretend, persuasion, double bluff and ironic joke constructs.
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Affiliation(s)
- Monica Mazza
- Department of Applied Clinical Sciences and Biotechnology, University of L’Aquila, Via Vetoio, Località Coppito, 67100 L’Aquila, Italy
- Reference Centre for Autism of the Abruzzo Region, Local Health Unit ASL 1, L’Aquila, Italy
| | - Maria Chiara Pino
- Department of Applied Clinical Sciences and Biotechnology, University of L’Aquila, Via Vetoio, Località Coppito, 67100 L’Aquila, Italy
- Reference Centre for Autism of the Abruzzo Region, Local Health Unit ASL 1, L’Aquila, Italy
| | - Roberto Keller
- Reference Centre for Adult Autism of the Piemonte Region, DSM Local Health Unit ASL Città di Torino, Turin, Italy
| | - Roberto Vagnetti
- Department of Applied Clinical Sciences and Biotechnology, University of L’Aquila, Via Vetoio, Località Coppito, 67100 L’Aquila, Italy
| | - Margherita Attanasio
- Department of Applied Clinical Sciences and Biotechnology, University of L’Aquila, Via Vetoio, Località Coppito, 67100 L’Aquila, Italy
- Reference Centre for Autism of the Abruzzo Region, Local Health Unit ASL 1, L’Aquila, Italy
| | - Angela Filocamo
- Reference Centre for Autism of the Abruzzo Region, Local Health Unit ASL 1, L’Aquila, Italy
| | - Ilenia Le Donne
- Reference Centre for Autism of the Abruzzo Region, Local Health Unit ASL 1, L’Aquila, Italy
| | - Francesco Masedu
- Department of Applied Clinical Sciences and Biotechnology, University of L’Aquila, Via Vetoio, Località Coppito, 67100 L’Aquila, Italy
| | - Marco Valenti
- Department of Applied Clinical Sciences and Biotechnology, University of L’Aquila, Via Vetoio, Località Coppito, 67100 L’Aquila, Italy
- Reference Centre for Autism of the Abruzzo Region, Local Health Unit ASL 1, L’Aquila, Italy
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17
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Wade M, Plamondon A, Jenkins JM. A Family Socialization Model of Transdiagnostic Risk for Psychopathology in Preschool Children. Res Child Adolesc Psychopathol 2021; 49:975-988. [PMID: 33687647 DOI: 10.1007/s10802-021-00789-x] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 02/11/2021] [Indexed: 12/17/2022]
Abstract
This longitudinal study examined the presence of general (P) and specific internalizing (INT) and externalizing (EXT) psychopathology factors in a community sample of preschool children. We assessed child and contextual correlates of P, INT, and EXT, and tested a model connecting socioeconomic risk to these factors through family socialization processes and child cognitive abilities. Participants were 501 children recruited at birth and followed up at 18 months and 3 years. Child and family functioning were measured using parental reports, observation, and standardized assessments. Both mothers and their partners reported on children's mental health, permitting the estimation of a trifactor model of psychopathology that captured caregivers' shared and unique perspectives with respect to P, INT, and EXT. Results revealed several transdiagnostic correlates of the common-perspective P factor, including family income, maternal education, maternal depression, and maternal responsiveness, as well as marginal associations with sibling negativity and children's language and theory of mind abilities. Several shared and unique correlates of INT and EXT were also observed. Structural equation modelling revealed that the effects of family income and maternal education on P operated indirectly through maternal responsiveness, while the effects of maternal education on INT and EXT operated through maternal reflective capacity, albeit in opposite directions. Together, these results suggest that the effects of socioeconomic disadvantage on general psychopathology are organized in a temporal cascade from distal to proximal risk.
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Affiliation(s)
- Mark Wade
- Department of Applied Psychology and Human Development, University of Toronto, 252 Bloor Street West, Toronto, ON, M5S1V6, Canada.
| | - Andre Plamondon
- Département Des Fondements Et Pratiques en Éducation, Laval University, Québec, Canada.
| | - Jennifer M Jenkins
- Department of Applied Psychology and Human Development, University of Toronto, 252 Bloor Street West, Toronto, ON, M5S1V6, Canada
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18
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Zhong J, Zhu H, Yin D, Ning Y, Zheng S, Zhang Y, Jia H. Paliperidone Compared with Haloperidol on the Theory of Mind Tasks in Schizophrenia: A Pilot Trial. Neuropsychiatr Dis Treat 2021; 17:3683-3691. [PMID: 34934321 PMCID: PMC8684422 DOI: 10.2147/ndt.s335597] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/23/2021] [Accepted: 11/22/2021] [Indexed: 11/23/2022] Open
Abstract
PURPOSE Theory of mind (ToM) is an important part of social cognitive function and is associated with medial prefrontal cortical (mPFC) activity. This study aimed to evaluate the efficacy of paliperidone in improving ToM task performance in patients with schizophrenia compared with haloperidol. PATIENTS AND METHODS This study was a single-center, single-blinded (assessor), parallel-group randomized clinical trial of patients with schizophrenia randomized to paliperidone or haloperidol. ToM was assessed at weeks 0, 8, 12, and 16 using the first-order belief, higher-order belief, faux-pas, and Reading the Mind in the Eyes tests. The primary outcome was the change in the ToM performance scores from baseline to after 16 weeks of treatment. RESULTS The participants received paliperidone (n = 29) or haloperidol (n = 31). For the first-order belief task, there were no between-group differences (P > 0.05) but time differences in both groups (P < 0.05). For the higher-order belief task, there were no between-group differences (P > 0.05), but there were time differences in both groups (P < 0.05) and a time×group interaction in the paliperidone group only (P < 0.05). For the faux-pas task, there was a difference between groups at week 16 (P < 0.05), and the improvement in time was significant for the paliperidone group only (P < 0.05). For the Reading the Mind in the Eyes task, there was an improvement over time for the paliperidone group only (P < 0.05). Safety was manageable in both groups. CONCLUSION Paliperidone treatment might be more effective than haloperidol in improving ToM task performance in schizophrenia. TRIAL REGISTRATION chictr.org.cn_identifier ChiCTR-IPR-15007635.
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Affiliation(s)
- Jie Zhong
- The National Clinical Research Center for Mental Disorders & Beijing Key Laboratory of Mental Disorders, Beijing Anding Hospital, Capital Medical University, Beijing, People's Republic of China.,Advanced Innovation Center for Human Brain Protection, Capital Medical University, Beijing, People's Republic of China
| | - Hong Zhu
- The National Clinical Research Center for Mental Disorders & Beijing Key Laboratory of Mental Disorders, Beijing Anding Hospital, Capital Medical University, Beijing, People's Republic of China.,Advanced Innovation Center for Human Brain Protection, Capital Medical University, Beijing, People's Republic of China
| | - Dongqing Yin
- The National Clinical Research Center for Mental Disorders & Beijing Key Laboratory of Mental Disorders, Beijing Anding Hospital, Capital Medical University, Beijing, People's Republic of China.,Advanced Innovation Center for Human Brain Protection, Capital Medical University, Beijing, People's Republic of China
| | - Yanzhe Ning
- The National Clinical Research Center for Mental Disorders & Beijing Key Laboratory of Mental Disorders, Beijing Anding Hospital, Capital Medical University, Beijing, People's Republic of China.,Advanced Innovation Center for Human Brain Protection, Capital Medical University, Beijing, People's Republic of China
| | - Sisi Zheng
- The National Clinical Research Center for Mental Disorders & Beijing Key Laboratory of Mental Disorders, Beijing Anding Hospital, Capital Medical University, Beijing, People's Republic of China.,Advanced Innovation Center for Human Brain Protection, Capital Medical University, Beijing, People's Republic of China
| | - Yanbo Zhang
- Department of Psychiatry, Faculty of Medicine, and Dentistry, College of Health Sciences, University of Alberta, Edmonton, Alberta, Canada
| | - Hongxiao Jia
- The National Clinical Research Center for Mental Disorders & Beijing Key Laboratory of Mental Disorders, Beijing Anding Hospital, Capital Medical University, Beijing, People's Republic of China.,Advanced Innovation Center for Human Brain Protection, Capital Medical University, Beijing, People's Republic of China
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19
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Zurlo MC, Ruggiero M. Assessing Pragmatic Language Skills in Adults with Major Depressive Disorder: An Exploratory Study. Psychopathology 2021; 54:78-91. [PMID: 33690229 DOI: 10.1159/000513270] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/23/2020] [Accepted: 11/20/2020] [Indexed: 11/19/2022]
Abstract
INTRODUCTION There is increasing evidence that major depressive disorder (MDD) is associated with significant pragmatic language impairments. However, there is a lack of studies that use standardized tools and simultaneously investigate all pragmatic language skills among MDD patients. The aim of this study was to propose a more thorough investigation of all pragmatic language skills in patients with MDD. METHODS Twenty adults (aged 22-65) with a DSM-5 diagnosis of MDD were assessed using BLED Santa Lucia (Batteria sul Linguaggio dell'Emisfero Destro Santa Lucia), a battery designed to evaluate pragmatic language skills (comprehension of inferences, of picture and written metaphors, of indirect requests, of humoristic expressions, and of prosody). The performance of the MDD participants on all BLED Santa Lucia subscales was compared to 20 healthy control subjects (aged 20-60) matched for gender, age, years of education, and employment status. RESULTS MDD patients performed poorer than controls in comprehension of inferences (p < 0.01), picture metaphors (p < 0.001), written metaphors (p < 0.001), indirect requests (p < 0.01), humoristic expression (p < 0.05), and prosody (p < 0.05). CONCLUSIONS All pragmatic language skills can be significantly impaired in MDD patients. A valid assessment of all pragmatic language skills can allow, for each patient, the definition of a specific profile of risk and protective factors before and during psychotherapy.
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Affiliation(s)
- Maria Clelia Zurlo
- Dynamic Psychology Laboratory, Department of Political Sciences, University of Naples Federico II, Naples, Italy,
| | - Maura Ruggiero
- Department of Humanities, University of Naples Federico II, Naples, Italy
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20
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Giurgi-Oncu C, Bredicean C, Frandeș M, Enătescu V, Papavă I, Riviș I, Ursoniu S. Social Inferences as Mediators of Wellbeing in Depression. Neuropsychiatr Dis Treat 2021; 17:1679-1687. [PMID: 34079265 PMCID: PMC8166309 DOI: 10.2147/ndt.s309009] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/01/2021] [Accepted: 04/29/2021] [Indexed: 11/23/2022] Open
Abstract
BACKGROUND Depression is an increasingly prevalent chronic mental health condition that involves a range of potentially negative implications, in the long term. Theory of Mind (ToM) serves to form and maintain social relationships, by accurately identifying thoughts and emotions in others. Defective ToM abilities have been noted in people with a history of clinical depression. PURPOSE To identify whether impairments of emotion recognition are correlated with a lower subjective feeling of wellbeing in people diagnosed with a chronic depressive illness. PATIENTS AND METHODS In a cross-sectional analysis of a recurrent depressive disorder (RDD, as per WHO ICD-10 nosology) cohort (n=57), the BECK depression scale and the "Reading the mind in the eyes" test were employed for the diagnosis of clinical symptoms, and for the evaluation of individual ToM skills, respectively. Wellbeing was quantified using the FANLCT scale. RESULTS The wellbeing of service-users decreased significantly, in correlation with their defective emotion recognition abilities. Additionally, a low capacity for the correct perception of emotions in other people appears to significantly influence the social relationships status, with scores of 14.00 (10.00-18.50) at low capacity vs 23.00 (17.58-24.75) at normal capacity (Mann-Whitney U-test, p < 0.001). Our study findings indicate that a normal ability for a correct recognition of emotions in others is significantly and strongly correlated with adequate social relationships (Spearman r = 0.757, p < 0.05). CONCLUSION Wellbeing is significantly correlated with the individual ability for a correct recognition of emotions in others.
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Affiliation(s)
- Cătălina Giurgi-Oncu
- Department of Neuroscience, Discipline of Psychiatry, "Victor Babeș" University of Medicine and Pharmacy, Timișoara, Romania.,"Pius Brînzeu" County Emergency Clinical Hospital, Timișoara, Romania
| | - Cristina Bredicean
- Department of Neuroscience, Discipline of Psychiatry, "Victor Babeș" University of Medicine and Pharmacy, Timișoara, Romania.,"Dr. Victor Popescu" Military Clinical Emergency Hospital, Timișoara, Romania
| | - Mirela Frandeș
- Department of Functional Sciences, Discipline of Medical Informatics and Biostatistics, "Victor Babeș" University of Medicine and Pharmacy, Timișoara, Romania
| | - Virgil Enătescu
- Department of Neuroscience, Discipline of Psychiatry, "Victor Babeș" University of Medicine and Pharmacy, Timișoara, Romania.,"Pius Brînzeu" County Emergency Clinical Hospital, Timișoara, Romania
| | - Ion Papavă
- Department of Neuroscience, Discipline of Psychiatry, "Victor Babeș" University of Medicine and Pharmacy, Timișoara, Romania.,"Pius Brînzeu" County Emergency Clinical Hospital, Timișoara, Romania
| | - Ioana Riviș
- "Carol Davila" University of Medicine and Pharmacy, Bucharest, Romania
| | - Sorin Ursoniu
- Department of Functional Sciences, Discipline of Public Health, Center for Translational Research and Systems Medicine, "Victor Babeș" University of Medicine and Pharmacy, Timișoara, Romania
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21
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Naguy A, Hyat AJ. Theory of mind across psychiatric diagnoses-A clinical perspicacity. Asian J Psychiatr 2020; 54:102293. [PMID: 32682302 DOI: 10.1016/j.ajp.2020.102293] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/19/2020] [Revised: 07/03/2020] [Accepted: 07/04/2020] [Indexed: 11/25/2022]
Affiliation(s)
- Ahmed Naguy
- Al-Manara CAP Centre, Kuwait Centre for Mental Health (KCMH), Jamal Abdul-Nassir St, Shuwaikh, Kuwait.
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22
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Konstantakopoulos G, Ioannidi N, Psarros C, Patrikelis P, Stefanatou P, Kravariti E. The impact of neurocognition on mentalizing in euthymic bipolar disorder versus schizophrenia. Cogn Neuropsychiatry 2020; 25:405-420. [PMID: 33050828 DOI: 10.1080/13546805.2020.1829579] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
Introduction: Theory of mind (ToM) or mentalizing deficits have been found in schizophrenia (SZ) and bipolar disorder (BD), but their relationships to patients' coexistent neurocognitive deficits are still unclear. The present study aimed to explore the possible differential involvement of neurocognitive deficits in ToM impairments in SZ and euthymic BD. Methods: Fifty-three euthymic patients with BD type I, 54 clinically stable patients with SZ, and 53 healthy participants were assessed with an advanced ToM task (Faux Pas Recognition Test) which measures cognitive and affective ToM components, and a comprehensive battery of neuropsychological measures. The three groups were matched for gender, age and education. Results: Patients with BD showed significant impairment, comparable to that in SZ, only in the cognitive facet of ToM, whereas SZ patients had significantly poorer performance than both BD patients and healthy participants in overall and affective ToM. In both SZ and euthymic BD, ToM performance was related to deficits in particular cognitive functions. After controlling for coexistent neurocognitive deficits, overall and affective ToM in SZ were still impaired whereas the cognitive ToM impairment in BD and SZ did not remained statistically significant. Conclusions: Our findings suggest a different profile of ToM deficits between SZ and BD and an independence of ToM dysfunction from concurrent neurocognitive deficits in SZ but not in BD.
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Affiliation(s)
- George Konstantakopoulos
- First Department of Psychiatry, National & Kapodistrian University of Athens, Eginition Hospital, Athens, Greece.,Department of Psychosis Studies, Institute of Psychiatry, Psychology and Neuroscience, King's College London, London, UK
| | - Nikoleta Ioannidi
- First Department of Psychiatry, National & Kapodistrian University of Athens, Eginition Hospital, Athens, Greece
| | - Constantin Psarros
- First Department of Psychiatry, National & Kapodistrian University of Athens, Eginition Hospital, Athens, Greece
| | - Panayiotis Patrikelis
- Department of Neurosurgery, National & Kapodistrian University of Athens, Evangelismos Hospital, Athens, Greece
| | - Pentagiotissa Stefanatou
- First Department of Psychiatry, National & Kapodistrian University of Athens, Eginition Hospital, Athens, Greece
| | - Eugenia Kravariti
- Department of Psychosis Studies, Institute of Psychiatry, Psychology and Neuroscience, King's College London, London, UK
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23
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Durmaz O, Baykan H. Mentalizing self and others: A controlled study investigating the relationship between alexithymia and theory of mind in major depressive disorder. Indian J Psychiatry 2020; 62:559-565. [PMID: 33678838 PMCID: PMC7909025 DOI: 10.4103/psychiatry.indianjpsychiatry_554_19] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/17/2019] [Revised: 04/10/2020] [Accepted: 07/23/2020] [Indexed: 12/02/2022] Open
Abstract
BACKGROUND Theory of mind (ToM) and alexithymia have been reported to relate with depression in recent studies. However, data regarding the role of alexithymia and ToM in depression remain uncertain. AIM The aim of the current study was to determine the levels of alexithymia and ToM abilities as well as their relationship with each other and clinical features in major depressive disorder (MDD). MATERIALS AND METHODS Patients diagnosed with MDD and healthy controls were undergone sociodemographic data, Beck Depression Inventory, Beck Anxiety Inventory, Toronto Alexithymia Scale (TAS-20), and reading the mind in the eyes test (RMET) to determine the depression, anxiety, alexithymia, and ToM abilities. RESULTS Depression, anxiety, and alexithymia levels were higher, while ToM abilities were found to be decreased in MDD patients relative to controls. A positive correlation was observed between depression levels and alexithymia levels in terms of difficulty in identifying feelings subscale and total scores of TAS-20 (P = 0.006, P = 0.036, respectively), while a positive correlation was also observed between anxiety levels and alexithymia levels in terms of difficulty in describing feelings subscale scores of TAS-20 (P = 0.02) in depressed group. No correlation was found between depression, anxiety levels, and RMET accuracy scores. CONCLUSION Our results suggest alexithymia and impaired ToM abilities might be prominent but prone to be distinct clinical constructs in MDD patients.
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Affiliation(s)
- Onur Durmaz
- Department of Psychiatry, Erenkoy Mental Health and Neurology Training and Research Hospital, Istanbul, Turkey
| | - Hayriye Baykan
- Department of Psychiatry, Faculty of Medicine, Balikesir University, Balikesir, Turkey
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24
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de Siqueira Rotenberg L, Beraldi GH, Okawa Belizario G, Lafer B. Impaired social cognition in bipolar disorder: A meta-analysis of Theory of Mind in euthymic patients. Aust N Z J Psychiatry 2020; 54:783-796. [PMID: 32447967 DOI: 10.1177/0004867420924109] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
OBJECTIVE To conduct a meta-analysis of Theory of Mind studies exclusively in euthymic patients with bipolar disorder. METHOD After the exclusion of studies evaluating symptomatic patients during acute episodes, we performed a meta-analysis including a total of 30 studies, comparing 1294 euthymic bipolar disorder patients and 1116 healthy controls. RESULTS Patients with bipolar disorder presented a significant impairment in Theory of Mind performance when compared to controls (Hedge's g = -0.589, 95% confidence interval: -0.764 to -0.414, Z = -6.594, p < 0.001). When compared to controls, Theory of Mind was impaired in patients with both bipolar disorder I (Hedge's g = -0.663, 95% confidence interval: -0.954 to -0.372, Z = -4.462, p < 0.001) and bipolar disorder II (Hedge's g = -1.165, 95% confidence interval: -1.915 to -0.415, Z = -3.044, p = 0.002). Theory of Mind impairments were also significantly more severe in verbal tasks (Hedge's g = -1.077, 95% confidence interval: -1.610 to -0.544, Z = -3.961 p < 0.001) than visual tasks (Hedge's g =-0.614, 95% confidence interval: -0.844 to -0.384, Z = -5.231, p < 0.001) when compared to controls. CONCLUSION The results obtained confirm that Theory of Mind is impaired in remitted bipolar disorder patients, being a potential endophenotype for bipolar disorder. Moreover, we found higher deficits in verbal Theory of Mind, compared with visual Theory of Mind. Since most studies were cross-sectional, there is a need for longitudinal studies to evaluate whether the deficits detected in Theory of Mind are progressive over the course of the illness.
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Affiliation(s)
- Luisa de Siqueira Rotenberg
- Bipolar Disorder Research Program (PROMAN), Instituto de Psiquiatria, Hospital das Clínicas HCFMUSP, Faculdade de Medicina, Universidade de Sao Paulo, São Paulo, Brazil
| | - Gabriel Henrique Beraldi
- Bipolar Disorder Research Program (PROMAN), Instituto de Psiquiatria, Hospital das Clínicas HCFMUSP, Faculdade de Medicina, Universidade de Sao Paulo, São Paulo, Brazil
| | - Gabriel Okawa Belizario
- Bipolar Disorder Research Program (PROMAN), Instituto de Psiquiatria, Hospital das Clínicas HCFMUSP, Faculdade de Medicina, Universidade de Sao Paulo, São Paulo, Brazil
| | - Beny Lafer
- Bipolar Disorder Research Program (PROMAN), Instituto de Psiquiatria, Hospital das Clínicas HCFMUSP, Faculdade de Medicina, Universidade de Sao Paulo, São Paulo, Brazil
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25
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Network analysis of schizotypal personality traits and their association with other subclinical psychiatric features. Asian J Psychiatr 2019; 44:209-216. [PMID: 31419738 DOI: 10.1016/j.ajp.2019.08.005] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/18/2019] [Revised: 08/01/2019] [Accepted: 08/03/2019] [Indexed: 12/13/2022]
Abstract
Schizotypal personality (SP) traits have been found to be correlated with autistic traits, obsessive-compulsive traits, depressive symptoms and anxiety symptoms. However, the overall pattern of the relationship remains unclear. The purpose of this study was to investigate the network structure between SP traits and other subclinical features (symptoms or traits) and test the replicability of these relationships. A total of 2204 college students completed measurements for SP traits, autistic traits, obsessive-compulsive traits, depressive symptoms and anxiety symptoms, and a validated subsample of 814 completed the same questionnaires again three months later. Using network analysis, we constructed the network structure of subclinical features and then tested its replicability. We found that interpersonal features were the bridge node connecting SP traits and autistic traits (social skill: r = 0.50; attention switching: r = 0.14; communication: r = 0.12), while cognitive-perceptual (obsessing: r = 0.05; neutralizing: r = 0.06) and disorganization (obsessing: r = 0.11) features were the SP traits associated with obsessive-compulsive traits. In addition to interpersonal features (r = 0.10), disorganization (r = 0.12) and cognitive-perceptual (r = 0.05) features were also the overlap between depressive symptoms and SP traits. Anxiety symptoms only connected with interpersonal (r = 0.05) but not cognitive-perceptual features of SP traits. The network showed high predictability (43%) and interpersonal features of SP traits had the highest expected influence (1.67) among all nodes, which may be a potential target for intervention. High similarities were found on network structure (r = 0.86) and expected influence (r = 0.96), and no significant difference on global connectivity was found between these two networks (difference value = 0.45, p = 0.135), suggesting the replicability of the network structure.
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