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Indicators of low feasibility may be a high dropout rate, a low attendance rate and low treatment satisfaction, which threaten the validity of clinical research studies. Given the severity and chronicity of bipolar disorder and its impact on psychosocial functioning, effective treatments are needed to alleviate depressive and manic symptoms. The study evaluated the feasibility and preliminary treatment effects of a novel disorder\u2010specific metacognitive group training for bipolar disorder (MCT\u2010Bipolar), which targets cognitive biases specific to depressive and manic episodes while also incorporating mindfulness techniques. Forty\u2010eight outpatients with bipolar disorder I and II participated in the training conducted by a clinical psychologist for eight consecutive weeks in groups of six to 10 people. Inclusion criteria were euthymia or mild or moderate depressive symptoms. Predictors of dropout and attendance rates were analysed using regression methods, and secondary exploratory analyses examined changes in various efficacy indicators between baseline, 1\u2009week after training and 6\u2009months after training using linear mixed models. In total, 10 participants (20.8%) dropped out, while completers attended an average of six out of eight sessions. Treatment satisfaction of the completers was high. Linear mixed models revealed an increase in mindfulness from baseline to follow\u2010up. Results on psychosocial functioning showed an increase from baseline to post\u2010training, though this effect disappeared at the 6\u2010month follow\u2010up. Findings support the feasibility of MCT\u2010Bipolar and suggest potential benefits for mindfulness and short\u2010term psychosocial functioning. Further research with larger samples and a control group is needed to assess its efficacy.<\/jats:p>\n                  <jats:p>\n                    <jats:bold>Trial Registration:<\/jats:bold>\n                    The evaluation study is registered in the German Registry of Clinical trials (DRKS, registration number DRKS00035704) and received approval from the ethical committee of Charit\u00e9 \u2013 University Hospital Berlin (No. EA1\/076\/22).\n                  <\/jats:p>","DOI":"10.1002\/cpp.70294","type":"journal-article","created":{"date-parts":[[2026,6,8]],"date-time":"2026-06-08T03:15:26Z","timestamp":1780888526000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Rethinking Cognitive Interventions in Bipolar Disorder: Feasibility and First Insights From Metacognitive Group Training (MCT\u2010Bipolar)"],"prefix":"10.1002","volume":"33","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-8123-5017","authenticated-orcid":false,"given":"Antonie","family":"Schoenleber","sequence":"first","affiliation":[{"name":"Charit\u00e9 \u2013 University Medical Center Berlin, Corporate Member of Freie Universit\u00e4t Berlin and Humboldt\u2010Universit\u00e4t zu Berlin, Department of Psychiatry and Neurosciences, Charit\u00e9 Campus Mitte  Berlin Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Esther","family":"Quinlivan","sequence":"additional","affiliation":[{"name":"Charit\u00e9 \u2013 University Medical Center Berlin, Corporate Member of Freie Universit\u00e4t Berlin and Humboldt\u2010Universit\u00e4t zu Berlin, Department of Psychiatry and Neurosciences, Charit\u00e9 Campus Mitte  Berlin Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Lena","family":"Jelinek","sequence":"additional","affiliation":[{"name":"Department of Psychotherapy and Psychiatry University Medical Center Hamburg\u2010Eppendorf  Hamburg Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2845-8665","authenticated-orcid":false,"given":"Franziska","family":"Miegel","sequence":"additional","affiliation":[{"name":"Department of Psychotherapy and Psychiatry University Medical Center Hamburg\u2010Eppendorf  Hamburg Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Felix","family":"Bermpohl","sequence":"additional","affiliation":[{"name":"Charit\u00e9 \u2013 University Medical Center Berlin, Corporate Member of Freie Universit\u00e4t Berlin and Humboldt\u2010Universit\u00e4t zu Berlin, Department of Psychiatry and Psychotherapy, Charit\u00e9 at St. Hedwig Hospital  Berlin Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8601-0143","authenticated-orcid":false,"given":"Steffen","family":"Moritz","sequence":"additional","affiliation":[{"name":"Department of Psychotherapy and Psychiatry University Medical Center Hamburg\u2010Eppendorf  Hamburg Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9598-0029","authenticated-orcid":false,"given":"Stefanie","family":"Schreiter","sequence":"additional","affiliation":[{"name":"Charit\u00e9 \u2013 University Medical Center Berlin, Corporate Member of Freie Universit\u00e4t Berlin and Humboldt\u2010Universit\u00e4t zu Berlin, Department of Psychiatry and Neurosciences, Charit\u00e9 Campus Mitte  Berlin Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8859-4234","authenticated-orcid":false,"given":"Eva","family":"Friedel","sequence":"additional","affiliation":[{"name":"Charit\u00e9 \u2013 University Medical Center Berlin, Corporate Member of Freie Universit\u00e4t Berlin and Humboldt\u2010Universit\u00e4t zu Berlin, Department of Psychiatry and Neurosciences, Charit\u00e9 Campus Mitte  Berlin Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2026,6,7]]},"reference":[{"key":"e_1_2_10_2_1","doi-asserted-by":"publisher","DOI":"10.1002\/cpp.3065"},{"key":"e_1_2_10_3_1","doi-asserted-by":"publisher","DOI":"10.1521\/ijct.2009.2.4.354"},{"key":"e_1_2_10_4_1","doi-asserted-by":"publisher","DOI":"10.1016\/S0006-3223(96)00548-3"},{"key":"e_1_2_10_5_1","volume-title":"Diagnostic and Statistical Manual of Mental Disorders: DSM\u20105","author":"American Psychiatric Association","year":"2017"},{"key":"e_1_2_10_6_1","doi-asserted-by":"publisher","DOI":"10.1111\/bdi.13243"},{"key":"e_1_2_10_7_1","unstructured":"Aster M. 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