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In this study, we addressed these open issues by applying online TMS during a dual-task situation. For this purpose, participants performed a dual task in fixed-order blocks with a constant order of tasks and in random-order block, in which the order of tasks varied randomly and thus demands on task-order coordination were increased. In Experiment 1, TMS of the lPFC compared with control TMS conditions impaired dual-task performance in random-order blocks, whereas performance in fixed-order blocks was unaffected by TMS. In Experiment 2, we tested for the specificity of the lPFC TMS effect on task-order coordination by applying TMS over the preSMA. We showed that preSMA TMS did not affect dual-task performance, neither in fixed-order nor in random-order blocks. Results of this study indicate that the lPFC, but not the preSMA, is causally involved in implementing task-order coordination processes in dual-task situations. <\/jats:p>","DOI":"10.1162\/jocn_a_01466","type":"journal-article","created":{"date-parts":[[2019,9,3]],"date-time":"2019-09-03T16:16:52Z","timestamp":1567527412000},"page":"1840-1856","source":"Crossref","is-referenced-by-count":16,"title":["The Causal Role of the Lateral Prefrontal Cortex for Task-order Coordination in Dual-task Situations: A Study with Transcranial Magnetic Stimulation"],"prefix":"10.1162","volume":"31","author":[{"given":"Sebastian","family":"K\u00fcbler","sequence":"first","affiliation":[{"name":"Humboldt-Universit\u00e4t zu Berlin"},{"name":"Martin-Luther University Halle-Wittenberg"}]},{"given":"Alexander","family":"Soutschek","sequence":"additional","affiliation":[{"name":"University of 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