Origins and endpoints of the core systems of number. Reply to Fias and Verguts

In summary, we follow Feigenson et al.’s proposal todistinguish two core systems of number. In addition weoffer a specific theory of how symbolic and approximatenumber representations can develop and the relationbetween them by describing how one and the same systemcan behave differently depending on the type of input: inan approximate way with non-symbolic stimuli, in anexact way with symbolic stimuli.