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It has been proposed that this is due to \u2018cortical recycling\u2019, where numerosity processing takes over circuits originally processing space. Do such \u2018recycled\u2019 circuits retain their original functionality? Here, we investigate interactions between numerosity and motion direction, two functions that both localize to parietal cortex. We describe a new phenomenon in which visual motion direction adapts nonsymbolic numerosity perception, giving rise to a repulsive aftereffect: motion to the left adapts small numbers, leading to overestimation of numerosity, while motion to the right adapts large numbers, resulting in underestimation. The reference frame of this effect is spatiotopic. Together with the tuning properties of the effect this suggests that motion direction-numerosity cross-adaptation may occur in a homolog of area LIP. \u2018Cortical recycling\u2019 thus expands but does not obliterate the functions originally performed by the recycled circuit, allowing for shared computations across domains.<\/jats:p>","DOI":"10.7554\/elife.10806","type":"journal-article","created":{"date-parts":[[2016,1,15]],"date-time":"2016-01-15T10:20:08Z","timestamp":1452853208000},"source":"Crossref","is-referenced-by-count":23,"title":["Motion along the mental number line reveals shared representations for numerosity and space"],"prefix":"10.7554","volume":"5","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-0661-8859","authenticated-orcid":true,"given":"Caspar M","family":"Schwiedrzik","sequence":"first","affiliation":[{"name":"Laboratory of Neural Systems, The Rockefeller University, New York, United 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