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The current study systematically reviews experimental methods used in studies on the main theories of BD: Reward Hypersensitivity Theory (RST) or Behavioral Activation System (BAS), Integrative Cognitive Model (ICM), Positive Emotion Persistence (PEP), Manic Defense theory (MD), and Mental Imagery (MI). The primary aim is to provide an overview of the used methods and to identify limitations and suggest areas of improvement.<\/jats:p><\/jats:sec><jats:sec><jats:title>Methods<\/jats:title><jats:p>A systematic search of six databases until October 2023 was conducted. Study selection involved two independent reviewers extracting data on experimental study design and methodology.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>A total of 84 experimental studies were reviewed. BAS and RST were the most frequently studied theories. The majority of these experimental studies focus on mechanisms of reward sensitivity. Other important elements of the reviewed theories, such as goal setting and\u2014attainment, situation selection (avoidance or approach), activation, affective\/emotional reactivity, and regulatory strategies, are understudied. Self\u2010report and neuropsychological tasks are most often used, while mood induction and physiological measures are rarely used.<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusion<\/jats:title><jats:p>There is a need for more consensus on the operationalization of psychological theories of mania. Standardization of test batteries could improve comparability among studies and foster a more systematic approach to experimental research. Research on affective (activated) states is still underrepresented in comparison with studies on trait vulnerabilities.<\/jats:p><\/jats:sec>","DOI":"10.1111\/bdi.13463","type":"journal-article","created":{"date-parts":[[2024,7,24]],"date-time":"2024-07-24T02:46:16Z","timestamp":1721789176000},"page":"646-660","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":3,"title":["How to study psychological mechanisms of mania? A\u00a0systematic review on the methodology of experimental studies on manic mood dysregulation of leading theories on bipolar disorder"],"prefix":"10.1111","volume":"26","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-4468-3934","authenticated-orcid":false,"given":"V. F. 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