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In numerical processing, evidence was found for differential directional preferences of space\u2013number associations in cultures with opposite reading direction systems. This may affect finger\u2010counting preferences like the starting hand, which in turn have previously been associated with differing lateralization. Such studies raise the question of whether number culture may also play a distinct role in the lateralization of the intraparietal sulcus (IPS), the hallmark region of numerical magnitude processing.<\/jats:p><\/jats:sec><jats:sec><jats:title>Method<\/jats:title><jats:p>In our preregistered cross\u2010cultural study, we applied anodal transcranial direct current stimulation (tDCS) over the left versus right IPS to investigate the effect of stimulation as compared to sham in Iranians (with right\u2010to\u2010left reading system) and Germans (with left\u2010to\u2010right reading system).<\/jats:p><\/jats:sec><jats:sec><jats:title>Finding<\/jats:title><jats:p>Results indicated no overall effect of stimulation; however, exploratory analyses revealed that tDCS over the left and right IPS facilitated number processing in Iranians compared to Germans after controlling for training effects. Finger\u2010counting direction was not found to be decisive for this effect.<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusion<\/jats:title><jats:p>At the end, number processing might be bilaterally represented in the IPS; however, our exploratory analyses emphasize the need for further investigation on the potential role of culture in the representations of numbers.<\/jats:p><\/jats:sec>","DOI":"10.1002\/brb3.70353","type":"journal-article","created":{"date-parts":[[2025,3,12]],"date-time":"2025-03-12T04:50:45Z","timestamp":1741755045000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Does the Brain Care Which Direction We Read? 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