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Neural evidence from both human and non-human primates suggests the parietal cortex as a primary locus of numerical estimation, but it is unclear whether the numerical competencies observed across non-primate species are subserved by similar neural mechanisms. Moreover, because studies with non-human animals typically involve extensive training, little is known about the spontaneous numerical capacities of non-human animals. To address these questions, we examined the neural underpinnings of number perception using awake canine functional magnetic resonance imaging. Dogs passively viewed dot arrays that varied in ratio and, critically, received no task-relevant training or exposure prior to testing. We found evidence of ratio-dependent activation, which is a key feature of the ANS, in canine parietotemporal cortex in the majority of dogs tested. This finding is suggestive of a neural mechanism for quantity perception that has been conserved across mammalian evolution.<\/jats:p>","DOI":"10.1098\/rsbl.2019.0666","type":"journal-article","created":{"date-parts":[[2019,12,18]],"date-time":"2019-12-18T03:06:03Z","timestamp":1576638363000},"update-policy":"https:\/\/doi.org\/10.1098\/crossmark-policy","source":"Crossref","is-referenced-by-count":22,"title":["Canine sense of quantity: evidence for numerical ratio-dependent activation in parietotemporal cortex"],"prefix":"10.1098","volume":"15","author":[{"given":"Lauren S.","family":"Aulet","sequence":"first","affiliation":[{"name":"Atlanta, GA 30322, USA 1","department":["Department of Psychology, Emory University,"]}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Veronica C.","family":"Chiu","sequence":"additional","affiliation":[{"name":"Atlanta, GA 30322, USA 1","department":["Department of Psychology, Emory University,"]}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Ashley","family":"Prichard","sequence":"additional","affiliation":[{"name":"Atlanta, GA 30322, USA 1","department":["Department of Psychology, Emory University,"]}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Mark","family":"Spivak","sequence":"additional","affiliation":[{"name":"Atlanta, GA 30328, USA 2","department":["Comprehensive Pet Therapy,"]}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Stella F.","family":"Lourenco","sequence":"additional","affiliation":[{"name":"Atlanta, GA 30322, USA 1","department":["Department of Psychology, Emory University,"]}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8691-7973","authenticated-orcid":true,"given":"Gregory S.","family":"Berns","sequence":"additional","affiliation":[{"name":"Atlanta, GA 30322, USA 1","department":["Department of Psychology, Emory University,"]}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"175","published-online":{"date-parts":[[2019,12,18]]},"reference":[{"key":"2026010519285955000_RSBL20190666C1","unstructured":"Brannon\n              EM\n            \n          . 2005What animals know about numbers. 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