{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,5,18]],"date-time":"2026-05-18T06:14:21Z","timestamp":1779084861065,"version":"3.51.4"},"reference-count":147,"publisher":"Frontiers Media SA","license":[{"start":{"date-parts":[[2023,10,27]],"date-time":"2023-10-27T00:00:00Z","timestamp":1698364800000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":["frontiersin.org"],"crossmark-restriction":true},"short-container-title":["Front. Hum. Neurosci."],"abstract":"<jats:p>In 1974, Roger Sperry, based on his seminal studies on the split-brain condition, concluded that math was almost exclusively sustained by the language dominant left hemisphere. The right hemisphere could perform additions up to sums less than 20, the only exception to a complete left hemisphere dominance. Studies on lateralized focal lesions came to a similar conclusion, except for written complex calculation, where spatial abilities are needed to display digits in the right location according to the specific requirements of calculation procedures. Fifty years later, the contribution of new theoretical and instrumental tools lead to a much more complex picture, whereby, while left hemisphere dominance for math in the right-handed is confirmed for most functions, several math related tasks seem to be carried out in the right hemisphere. The developmental trajectory in the lateralization of math functions has also been clarified. This corpus of knowledge is reviewed here. The right hemisphere does not simply offer its support when calculation requires generic space processing, but its role can be very specific. For example, the right parietal lobe seems to store the operation-specific spatial layout required for complex arithmetical procedures and areas like the right insula are necessary in parsing complex numbers containing zero. Evidence is found for a complex orchestration between the two hemispheres even for simple tasks: each hemisphere has its specific role, concurring to the correct result. As for development, data point to right dominance for basic numerical processes. The picture that emerges at school age is a bilateral pattern with a significantly greater involvement of the right-hemisphere, particularly in non-symbolic tasks. The intraparietal sulcus shows a left hemisphere preponderance in response to symbolic stimuli at this age.<\/jats:p>","DOI":"10.3389\/fnhum.2023.1288154","type":"journal-article","created":{"date-parts":[[2023,10,27]],"date-time":"2023-10-27T22:04:40Z","timestamp":1698444280000},"update-policy":"https:\/\/doi.org\/10.3389\/crossmark-policy","source":"Crossref","is-referenced-by-count":14,"title":["The brain lateralization and development of math functions: progress since Sperry, 1974"],"prefix":"10.3389","volume":"17","author":[{"given":"Elena","family":"Salillas","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Silvia","family":"Benavides-Varela","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Carlo","family":"Semenza","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1965","published-online":{"date-parts":[[2023,10,27]]},"reference":[{"key":"ref1","doi-asserted-by":"publisher","first-page":"3048","DOI":"10.1016\/j.neuroimage.2010.11.009","article-title":"Role of distinct parietal areas in arithmetic: an fMRI-guided TMS study","volume":"54","author":"Andres","year":"2011","journal-title":"NeuroImage"},{"key":"ref2","doi-asserted-by":"publisher","first-page":"283","DOI":"10.1016\/j.cogbrainres.2005.06.002","article-title":"Hemispheric lateralization of number comparison","volume":"25","author":"Andres","year":"2005","journal-title":"Cogn. 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