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However, heterogeneity and small effect sizes remain a common issue. One potential cause may be interindividual variability of the electric fields induced by tDCS. Here, we compared electric field distributions and directions between two conventionally used electrode montages (i.e., one placing the return electrode over the ipsilateral buccinator muscle and one placing the return electrode [25 and 35\u00a0cm<jats:sup>2<\/jats:sup> surface area, respectively] over the contralateral supraorbital area; Experiment 1) and six alternative montages (electrode size: 9\u00a0cm<jats:sup>2<\/jats:sup>; Experiment 2) targeting the right posterior cerebellar hemisphere at 2\u00a0mA. Interindividual and montage differences in the achieved maximum field strength, focality, and direction of current flow were evaluated in 20 head models and the effects of individual differences in scalp\u2013cortex distance were examined. Results showed that while maximum field strength was comparable for all montages, focality was substantially improved for the alternative montages over inferior occipital positions. Our findings suggest that compared to several conventional montages extracerebellar electric fields are significantly reduced by placing smaller electrodes in closer vicinity of the targeted area.<\/jats:p>","DOI":"10.1038\/s41598-021-01755-9","type":"journal-article","created":{"date-parts":[[2021,11,12]],"date-time":"2021-11-12T11:02:44Z","timestamp":1636714964000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":37,"title":["Electrode montage-dependent intracranial variability in electric fields induced by cerebellar transcranial direct current stimulation"],"prefix":"10.1038","volume":"11","author":[{"given":"Jana","family":"Klaus","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Dennis J. L. 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