Outpatient care for adolescents' and young adults' mental health: promoting self- and others' understanding through a metacognitive interpersonal therapy-informed psychological intervention.

Introduction: Psychological distress may result in impairment and difficulty understanding oneself and others. Thus, addressing metacognitive issues in psychotherapy may improve psychopathology in adolescents and young adults (AYAs). We aimed to compare metacognitive interpersonal therapy (MIT)-informed psychotherapy with other treatment-as-usual (TAU) therapies. Methods: We administered the Global Assessment of Functioning (GAF) scale, the Clinical Global Impressions-Severity (CGI-S) scale, and the Brief Psychiatric Rating Scale (BPRS) at baseline (BL) and at treatment termination (the endpoint was at 6 months and any last results obtained before that term were carried forward in analyzes). Patients received concomitant psychiatric and psychological treatment. Results: Sixty AYAs were involved in the study. There was a significant reduction in symptomatology after the intervention. Twelve patients (17%) dropped out; treatment adherence was 83%. In the MIT group, 2 patients dropped out (11%), and in the TAU group, 9 patients dropped out (19%). All scales showed a significant reduction in symptoms between baseline (BL) and the 6-month endpoint: GAF (χ2 = 6.61, p < 0.001), BPRS (χ2 = 6.77, p < 0.001), and CGI (χ2 = 7.20, p < 0.001). There was a greater efficacy for the MIT group in terms of symptom reduction on the BPRS (t = 2.31; p < 0.05). Conclusion: The study confirmed the efficacy of early and integrated care in adolescence and suggested greater symptom reduction for a psychotherapeutic intervention focused on stimulating mentalization skills. The study indicates the usefulness of this type of approach in the treatment of adolescent psychopathology. Due to the small sample size, the results need replication.

Investigating the relationship between specific negative symptoms and metacognitive functioning in psychosis: A systematic review.

BACKGROUND: Disrupted metacognition is implicated in development and maintenance of negative symptoms, but more fine-grained analyses would inform precise treatment targeting for individual negative symptoms. AIMS: This systematic review identifies and examines datasets that test whether specific metacognitive capacities distinctly influence negative symptoms. MATERIALS & METHODS: PsycINFO, EMBASE, Medline and Cochrane Library databases plus hand searching of relevant articles, journals and grey literature identified quantitative research investigating negative symptoms and metacognition in adults aged 16+ with psychosis. Authors of included articles were contacted to identify unique datasets and missing information. Data were extracted for a risk of bias assessment using the Quality in Prognostic Studies tool. RESULTS: 85 published reports met criteria and are estimated to reflect 32 distinct datasets and 1623 unique participants. The data indicated uncertainty about the relationship between summed scores of negative symptoms and domains of metacognition, with significant findings indicating correlation coefficients from 0.88 to -0.23. Only eight studies investigated the relationship between metacognition and individual negative symptoms, with mixed findings. Studies were mostly moderate-to-low risk of bias. DISCUSSION: The relationship between negative symptoms and metacognition is rarely the focus of studies reviewed here, and negative symptom scores are often summed. This approach may obscure relationships between metacognitive domains and individual negative symptoms which may be important for understanding how negative symptoms are developed and maintained. CONLCLUSION: Methodological challenges around overlapping participants, variation in aggregation of negative symptom items and types of analyses used, make a strong case for use of Individual Participant Data Meta-Analysis to further elucidate these relationships.

Metacognitive interpersonal therapy-eating disorders versus cognitive behavioral therapy for eating disorders for non-underweight adults with eating disorders: study protocol for a pilot pre-registered randomized controlled trial.

Eating disorders (ED) are serious disorders characterized by an alteration of eating habits and excessive concern about weight and body shapes (Fairburn, 2002), accompanied by significant impairment inequality of life, high mortality rates and serious organic consequences (Jenkins et al., 2011; Treasure et al., 2015; 2020). Although evidence-based psychological therapies for nonunderweight ED presentations such as cognitive behavioral therapy for eating disorders (CBT-ED) are widely available, there is substantial scope for improvements, particularly in terms of efficacy and adherence. One option is to develop interventions to address elements of pathology not fully addressed by existing empirical supported treatments, such as incorporating techniques aimed at addressing interpersonal problems and personality disorder features into existing treatment delivery. We adapted Metacognitive Interpersonal Therapy, a psychological intervention supported by evidence for treating personality disorders and integrated it with existing CBT techniques for eating disorders (MIT-ED). MIT-ED targets aspects of ED that are not included in the transdiagnostic CBT-E model such as poor metacognition, or maladaptive interpersonal schemas. This is a pre-registered (Protocol number: 0000781) pilot randomized clinical trial aimed at assessing acceptability and feasibility of MIT-ED and establishing preliminary evidence of effectiveness for future larger studies. Twenty patients (10 in each arm) will be randomized to 20 sessions of individual psychotherapy, either MIT-ED or CBTE. Repeated follow-ups will be collected up to 24 months. Participants are recruited at a private outpatient clinic for ED treatment. Acceptability will be assessed via session attendance, completion rates and preliminary outcomes. The primary outcome is ED pathology assessed with the Eating Disorder Examination Questionnaire-6. Other ED outcomes assessed will be eating disorder attitudes, clinical impairment and binge eating pathology. Secondary treatment outcomes are anxiety, depression, and global symptomatology. We will also assess emotional awareness, emotion regulation and therapeutic alliance. Based on previous studies of MIT for personality disorders we hypothesize that MIT-ED will be acceptable to patients, evidenced by high treatment adherence and retention. We hypothesize that MIT-ED will be associated with reductions in eating disorder pathology, at least equivalent to CBT-E. Results will be used to inform the study design, sampling, likely effect sizes and choice of outcome measures for future larger trials of MIT-ED in ED samples.

Investigating the relationship between negative symptoms and metacognitive functioning in psychosis: An individual participant data meta-analysis.

PURPOSE: Negative symptoms are a persistent, yet under-explored problem in psychosis. Disturbances in metacognition are a potential causal factor in negative symptom development and maintenance. This meta-analysis uses individual participant data (IPD) from existing research to assess the relationship between negative symptoms and metacognition treated as summed scores and domains. METHODS: Data sets containing individuals with negative symptoms and metacognition data, aged 16+ with psychosis, were identified according to pre-specific parameters. IPD integrity and completeness were checked and data were synthesized in two-stage meta-analyses of each negative symptoms cluster compared with metacognition in seemingly unrelated regression using restricted maximum likelihood estimation. Planned and exploratory sensitivity analyses were also conducted. RESULTS: Thirty-three eligible data sets were identified with 21 with sufficient similarity and availability to be included in meta-analyses, corresponding to 1301 participants. The strongest relationships observed were between summed scores of negative symptoms and metacognition. Metacognitive domains of self-reflectivity and understanding others' minds, and expressive negative symptoms emerged as significant in some meta-analyses. The uncertainty of several effect estimates increased significantly when controlling for covariates. CONCLUSIONS: This robust meta-analysis highlights the impact of using summed versus domain-specific scores of metacognition and negative symptoms, and relationships are not as clear-cut as once believed. Findings support arguments for further differentiation of negative symptom profiles and continued granular exploration of the relationship between metacognition and negative symptoms.

Experiential techniques and therapeutic relationship in the treatment of narcissistic personality disorder: The case of Laura.

Experiential techniques can be used to address maladaptive interpersonal patterns in patients with personality disorders (PDs) as long as they are delivered minding about the therapeutic relationship. We present the case study of Laura, a 38-year-old woman presenting with covert narcissism, generalized anxiety disorder, depression, and complicated grief treated with metacognitive interpersonal therapy. Laura initially refused to engage in any experiential work out of fear of being judged and abandoned by her therapist. To navigate this therapeutic obstacle, the therapist focused on exploring and eventually repairing early alliance ruptures. Thereafter, Laura engaged in experiential work, which helped her address her narcissistic interpersonal patterns. After 2 years, Laura's symptoms and narcissistic problematic behaviors decreased. This case study can help us understand how experiential techniques can be successfully used in PD psychotherapy as long as attention to the therapy relationship is paid.

Metacognitive interpersonal group therapy for adolescents with avoidant personality disorder: The case of Sofia.

INTRODUCTION: Early intervention studies for adolescents and early adults are required to explore the acceptability and effectiveness of psychological therapies across the full range of personality disorders (PDs) beyond just borderline PD. The main aim of the current paper was to describe a Metacognitive Interpersonal Therapy group adaptation for adolescents (MIT-GA) presenting with PDs featuring overcontrol and social inhibition, and in particular Avoidant PD characteristics. METHODS: We report findings from a single case of a female adolescent diagnosed with Avoidant PD providing preliminary data on feasibility and the possible effectiveness of MIT-GA. RESULTS: Evidence of acceptability and meaningful clinical gains are described. CONCLUSIONS: Results suggest that MIT-GA could be a powerful treatment option in patients with generalized social avoidance who do not currently receive gold-standard psychotherapeutic treatments. This intervention also appears to be effective and cost-effective in initiating significant clinical changes in profiles of young patients with non-borderline PD symptoms.

Treating Avoidant Personality Disorder With Combined Individual Metacognitive Interpersonal Therapy and Group Mentalization-Based Treatment: A Pilot Study.

ABSTRACT: Avoidant personality disorder (AvPD) is a severe but understudied condition. The current pilot project reports data on acceptability and outcomes of a novel treatment combining biweekly individual metacognitive interpersonal therapy (MIT) and weekly mentalization-based therapy (MBT) group therapy. A total of 30 patients with AvPD were consecutively included in the program. The primary outcome was AvPD-specific personality functioning measured by self-report after treatment. Secondary outcomes were symptom distress, interpersonal problems, quality of life, and psychosocial functioning. Twenty-two patients completed treatment, with a mean duration of 13 months. On the primary outcome, effect sizes were generally moderate to large (effect size range: 0.59-1.10). On secondary outcomes, effect sizes were large (effect size range: 0.77-2.3). Both in terms of acceptability and outcomes, results are promising for the combination of MIT and MBT for AvPD. The approach is a strong candidate for further investigation in future large-scale randomized controlled trial.

Metacognitive interpersonal therapy in group versus TAU + waiting list for young adults with personality disorders: Randomized clinical trial.

Young adults presenting with personality disorders (PDs) featuring overcontrol and social inhibition urgently require effective psychological interventions to help them navigate important life transitions. metacognitive interpersonal therapy-group (MIT-G) is a time-limited group program designed to enable individuals to find adaptive solutions to their social difficulties. A small randomized clinical trial (RCT) of MIT-G versus treatment as usual (TAU) was conducted with the primary outcomes of improvements in social and interpersonal functioning and global psychological symptoms. Secondary outcomes were specific symptoms of anxiety and depression and changes in alexithymia and emotion dysregulation. From 40 participants, 20 were randomized to 16 weekly sessions of MIT-G, plus 3 individual sessions and 20 to TAU + waiting list. All 20 patients allocated to MIT-G completed treatments, while 2 dropped-out in the TAU arm. Patients in the MIT-G arm reported significant improvements on primary outcomes of functioning, interpersonal problems and global symptoms of medium magnitude, medium effect sizes for changes in depression and anxiety, and large magnitude changes for alexithymia. However, other than alexithymia no significant differences were observed between groups at treatment end. A Time × Condition interaction, indicated that MIT-G was associated with more rapid and larger magnitude improvements in functioning and alexithymia. MIT-G is a well-tolerated treatment option for young adults with overcontrolled PD. Further effectiveness studies in larger samples are underway. (PsycInfo Database Record (c) 2022 APA, all rights reserved).

A case study on a severe paranoid personality disorder client treated with metacognitive interpersonal therapy.

Paranoid personality disorder (PPD) is a severe condition, lacking specialized and empirically supported treatment. To provide the clinician with insights into how to treat this condition, we present a case study of a 61-year-old man with severe PPD who presented with ideas of persecution, emotionally charged hostility, and comorbid antisocial personality disorder. The client was treated with 6 months of Metacognitive Interpersonal Therapy, which included: creating a shared formulation of his paranoid attitudes; trying to change his inner self-image of self-as-inadequate and his interpersonal schemas where he saw the others as threatening. Guided imagery and rescripting techniques, coupled with behavioral experiments, were used to promote a change. At the end of the therapy the client reported a reliable change in general symptomatology and, specifically, in interpersonal sensitivity, hostility, and paranoid ideation; he could no longer be diagnosed as PPD and only some paranoid and antisocial characteristics remained.

Building the alliance and using experiential techniques in the early phases of psychotherapy for avoidant personality disorder.

Individuals experiencing avoidant personality disorder (AvPD) tend to make sense of social interactions via maladaptive self-and other attributions. They also experience difficulties in recognizing emotions. A further feature of AvPD psychopathology is the tendency to resort to maladaptive coping strategies, such as behavioral avoidance and perfectionism. Despite its impact, psychological treatments for AvPD remains poorly investigated. Herein, we describe the first five sessions of Metacognitive Interpersonal Therapy with a 28-year-old woman, whose treatment goal was to reduce social avoidance. We describe how this goal was achieved through a combination of working through the therapeutic relationship, alongside experiential techniques such as guided imagery, rescripting, and bodily work. Through this treatment configuration, the patient was able to increase self-awareness of her own emotions, enabling her to realize that she was guided by rigid schemas; specifically seeing herself as inadequate and others as judgmental. Finally, implications for the treatment of AvPD are discussed.

El Cambio De Los Patrones Corporales Relacionales En La Terapia Metacognitiva Interpersonal / Changing Embodied Relational Patterns In Metacognitive Interpersonal Therapy

Las personas con trastornos de personalidad tienden a atribuir significados según patrones mentales estereotipados que les dificultan alcanzar una adaptación y satisfacción social. Estos patrones van más allá de ser meras representaciones cognitivas sobre uno mismo y los demás, sino que están repletos de emociones, disposiciones de conducta y experiencias somáticas. El objetivo principal de este trabajo es presentar cómo la terapia metacognitiva interpersonal trabaja con los patrones corporales a través del uso de imágenes mentales y ejercicios sensoriomotores. Como se expone, este tipo de técnicas ayudan a revisar los componentes corporales de los patrones interpersonales desadaptativos y promueven la aparición de otros nuevos más saludables. Se pretende que los patrones resultantes incluyan aspectos más funcionales que impidan la puesta en marcha de las estrategias de afrontamiento impulsadas por los esquemas problemáticos. A través de la exposición de un caso clínico, se subraya que el trabajo experiencial debe llevarse siempre a cabo en el contexto de una regulación constante de la relación terapéutica que permita detectar cualquier posible impasse o ruptura. Igualmente, se muestra cómo el uso de ciertas técnicas en las fases iniciales puede permitir una formulación más dinámica y enriquecida de los esquemas disfuncionales. Finalmente, se discuten algunas implicaciones clínicas y se sugiere el trabajo experiencial como un componente crucial en el tratamiento de pacientes con problemas interpersonales graves, como ocurre en los trastornos de personalidad. (AU)

Individuals with personality disorders tend to attribute meaning according to stereotyped relationship patterns which prevent them from achieving social adaptation and fulfilment. These mental patterns are more than mere cognitive representations of the self and others. They are embodied and laden with affect, behavioral dispositions, and somatic experiences. The main purpose of this workis to present how metacognitive interpersonal therapy provides a platform for changing embodied patterns, via imagery and sensorimotor work. As discussed, these techniques facilitate the revision of the embodied component of maladaptive patterns and promote the emergence of new and healthier patterns. These new patterns comprise more adaptive aspects and corresponding lyimpede the enactment of previous maladaptive coping strategies that were driven by pathological schemas. We note howexperiential work is best performed in a context of constant regulation of the therapeutic relationship, in order to detect any possiblerelational impasses and ruptures, reflecting on them until they are repaired. We also show the use of techniques in the initial phaseof therapy to allow a more dynamic and rich case formulation. Finally, we discuss the implications of how experiential work mightbe a crucial component in psychotherapy for persons experiencing severe interpersonal problems such as personality disorders. (AU)

A cognitive model of diminished expression in schizophrenia: The interface of metacognition, cognitive symptoms and language disturbances.

The resistance of negative symptoms to pharmacologic treatment has spurred interest in understanding the psychological factors that contribute to their formation and persistence. However, little is understood about the psychological processes that reinforce and sustain the negative symptoms domain of diminished expression. Prior research has shown that higher levels of diminished expression relate to deficits in metacognitive capacity. We propose a more complex model in which diminished expression occurs when impairments in metacognitive self-reflectivity, alterations in higher-order language structure, and cognitive symptoms interact and thus interfere with persons' ability to understand and express emotions in ways others can recognize. Individuals with schizophrenia-spectrum disorders (N = 201) provided personal narratives detailing their life story and reflections about their mental illness. Self-reflectivity was measured with the Metacognition Assessment Scale-Abbreviated, and situation models were extracted from participants' personal narratives via Coh-Metrix 3.0, an automated program that calculates language indices. Diminished expression and cognitive symptoms were measured with the Positive and Negative Syndrome Scale. Structural equation models (SEM) examined whether self-reflectivity mediated the impact of cognitive symptoms and situation models on diminished expression. Results of the SEM revealed that self-reflectivity partially mediated the impact of situation models on diminished expression (ß = -.073, p = .008, ±95% CI [-0.126, -0.019]). and fully mediated the influence of cognitive symptoms in diminished expression (ß = 0.099, p = .001, ±95% CI [0.038, 0.160]). In conclusion, results suggest that self-reflectivity, linguistic cohesion, and cognitive symptoms may be useful targets for intervention in efforts to treat diminished expression in psychosis.

The intertwined path of perfectionism and self-criticism in a client with obsessive-compulsive personality disorder.

Psychotherapy for obsessive-compulsive personality disorder (OCPD), where perfectionism is a defining criterion, is understudied. Despite a high prevalence few evidence-based treatments are available for the presentation. Here we describe the course of a 6-month program of metacognitive interpersonal therapy with an OCPD patient with prominent perfectionism and self-criticism, which were considered primary outcomes of the case study. Therapy aimed initially at increasing awareness of maladaptive interpersonal schemas and promoting a healthy self. First, behavioral experiments were used to try and counteract perfectionism. Second, experiential techniques, such as guided imagery and rescripting, were used to help the client in connect with different, healthier aspects of the self, thus increasing personal and interpersonal wellbeing. Qualitative and quantitative outcomes at the intervention end and at 1-month follow-up are summarized. Finally, we reflect on how this case study can inform treatment of perfectionism in OCPD.

Cognitive theory of mind in bipolar disorder: Comparisons with healthy controls and associations with function.

Cognitive forms of Theory of Mind (ToM) have been linked to social function in Bipolar Disorder (BD). To explore this social functioning was assessed with the GAF and cognitive ToM was assessed with the Hinting Task and the Picture Sequencing Task (PST) in 45 patients with BP and 45 healthy controls. As predicted, the BD group took longer to complete the PST. The BD group did not offer more incorrect responses to either cognitive ToM task. Greater latency on the PST predicted poorer social function after controlling for symptoms, partially supporting a relationship between ToM and social function in BD.

Metacognitive Interpersonal Mindfulness-Based Training for Worry About Interpersonal Events: A Pilot Feasibility and Acceptability Study.

Individuals with personality disorders experience worry and repetitive thoughts regarding interpersonal scenarios. Mainstream mindfulness-based approaches may be insufficient to soothe these individual's distress due to difficulties in letting thoughts go and refocusing attention to the present moment. For this reason, we devised an adapted form of mindfulness-based program called Metacognitive Interpersonal Mindfulness-Based Training (MIMBT) for personality disorders. In this pilot study, 28 individuals attended nine weekly sessions to evaluate the feasibility and acceptability, and to establish preliminary outcomes. All individuals completed the program. Attendance was very high (96%). Significant changes were observed on the primary outcome of reduction in repetitive thinking, measured using the Metacognition Questionnaire-30. We also observed a decrease in depression severity. Despite important limitations, this pilot study suggests that MIMBT has the potential to be a viable and well-accepted option for increasing positive outcomes in the treatment of personality disorders. Clinical considerations and directions for future research are discussed.

Metacognitive Interpersonal Therapy in group (MIT-G) for young adults with personality disorders: A pilot randomized controlled trial.

Young adults with personality disorders (PD) other than borderline are in urgent need of validated treatments to help them in managing important life transitions. Therapeutic interventions focused upon social and interpersonal difficulties may facilitate these individuals in maximizing opportunities for employment, forming stable romantic relationships, and belong to social groups. It is also important that they are offered evidence-based, first-line time-limited treatments in order to maximize effectiveness and reduce costs. We developed a 16-session programme of group-based Metacognitive Interpersonal Therapy (MIT-G) including psychoeducation on the main interpersonal motives, an experiential component enabling practice of awareness of mental states; and use of mentalistic knowledge for purposeful problem-solving. We report a feasibility, acceptability, and clinical significance randomized clinical trial. Participants meeting inclusion criteria were randomized to receive MIT-G (n = 10) or waiting list+TAU (n = 10). Dropout rate was low and session attendance high (92.19%). Participants in the MIT-G arm had symptomatic and functional improvements consistent with large effect sizes. In the MIT-G arm similarly large effects were noted for increased capacity to understand mental states and regulate social interactions using mentalistic knowledge. Results were sustained at follow-up. Our findings suggest potential for applying MIT-G in larger samples to further test its effectiveness in reducing PD-related symptoms and problematic social functioning.

Metacognitive Interpersonal Therapy for Treating Persecutory Delusions in Schizophrenia.

MIT aims at progressively fostering metacognition until patients are able to understand what kind of interpersonal events or ideas about self and interpersonal interactions trigger their persecutory delusions and to question the delusional meaning they attribute to events.

Emotion dysregulation, impulsivity and personality disorder traits: A community sample study.

The present study was designed to test an emotion regulation framework to understand individual differences in personality disorder (PD) traits in a non-clinical sample. Specifically, we tested whether: selected dimensions of emotion dysregulation were differentially related to PD traits; and whether emotion dysregulation and impulsivity had independent associations with PD traits. A community sample of 399 individuals (mean age = 37.91; 56.6% males) completed self-report measures of PDs, emotion dysregulation and impulsivity. Emotion dysregulation facets and impulsivity had uniform bivariate associations with PD traits, but also evidenced unique associations in multiple regression analyses. Nonacceptance of emotional responses was the emotion dysregulation dimension underlying a wide array of PD. A limited repertoire of effective emotion regulation strategies was characteristic of cluster C PD, whereas emotional unawareness distinctly predicted schizoid PD. Antisocial PD traits were uniquely related to difficulties controlling impulsive behavior when upset. Finally, histrionic, narcissistic, and obsessive-compulsive PD were related to better self-reported emotion regulation. Impulsivity further explained a significant amount of variance in schizotypal, antisocial, borderline (positively), and obsessive-compulsive PD traits (negatively). If replicated in clinical samples, our findings will support the usefulness of targeting both emotional dysregulation and impulsivity in PDs psychotherapy.

The problem of overcontrol: Perfectionism, emotional inhibition, and personality disorders.

BACKGROUND AND AIMS: Some individuals with Personality Disorders (PD), particularly of a non-Borderline type, present with difficulties relating to over-control of cognitions, emotion and behavior, perfectionistic traits, and impaired social interactions. The current study sought to evaluate the strength of association, and interactions of both emotional inhibition and perfectionism in PD's, after controlling for symptoms and interpersonal problems. METHOD: We recruited a sample of 578 treatment seeking outpatients. Diagnosis of PD was made with the SCID-II. Individual's completed measures of perfectionism (Frost-MPS), Emotional Inhibition (EIS), Depression (BDI-II), Anxiety (STAI-Y), Global symptoms (SCL-90-R), and interpersonal problems (IIP-32). RESULTS: Perfectionism was related to interpersonal problems, to the majority of PD symptomatology and to PD severity via number of SCID-II criteria met. Emotional inhibition was linked to symptoms and interpersonal problems as well as with avoidant, dependent, depressive and paranoid PDs; and with overall PD Severity. Inhibition and perfectionism were correlated with each other. Both variables predicted PD above and beyond other variables assessed. Mediation modeling demonstrated that the effect of emotional inhibition on PD severity was fully mediated by perfectionism and interpersonal problems. CONCLUSIONS: Psychological mechanisms of overcontrol are a maintaining factor in many PDs. Both perfectionism and emotional inhibition impact on a broad range of PDs and there is an urgent need for research into these processes, and to adapt psychological interventions to consider these factors.

Metacognitive interpersonal therapy in group: a feasibility study.

Patients with personality disorders (PDs) other than borderline, with prominent features of social inhibition and over-regulation of emotions, are in need of specialized treatments. Individuals present with poor metacognition, that is the capacity to understand mental states and use psychological knowledge for the sake of purposeful problem solving; and are guided by maladaptive interpersonal schemas. We developed a short-term group intervention, Metacognitive Interpersonal Therapy in Groups (MIT-G), incorporating psychoeducational and experiential elements, to help these individuals become more aware of their drives when interacting with others; and to help them adopt more flexible behaviors via improvements in metacognition. We present results of an effectiveness study, evaluating whether we could replicate the initial positive results of our first pilot randomized controlled trial. Seventeen young adults outpatients with personality disorders were included in the 16 session program. Effect sizes were calculated for change from baseline to treatment end for the primary outcome, symptoms and functioning (Clinical Outcomes in Routine Evaluation Outcome Measure) and then for one putative mechanism of change - metacognition. Emotional dysregulation and alexithymia were also assessed. Qualitative evaluations of the acceptability and subjective impact of the treatment were also performed. MIT-G was acceptable to participants. There were medium to large magnitude changes from pre- to post- treatment on wellbeing, emotion dysregulation, alexithymia and metacognition. These gains were maintained at follow-up. There was evidence of clinically significant change on key variables. MITG appears acceptable to patients, as evidenced by the absence of drop-out from treatment. In light of the positive outcomes of this study and the expanding evidence base, MIT-G is a candidate for dissemination and investigations in larger trials as a possible effective intervention for PDs characterized by tendencies to overcontrol.