a1 Institute of Cognitive Neuroscience and Department of Psychology, University College London, London WC1N 3AR, United Kingdom email@example.com firstname.lastname@example.org http://www.icn.ucl.ac.uk/Research-Groups/Visual-Cognition-Group/index.php
In their target article, Rips et al. have presented the view that there is no necessary dependency between natural numbers and internal magnitude. However, they do not give enough weight to neuroimaging and neuropsychological studies. We provide evidence demonstrating that the acquisition of natural numbers depends on magnitude representation and that natural numbers develop from a general magnitude mechanism in the parietal lobes.