Measuring the approximate number system

Camilla Gilmore, N Attridge, Matthew Inglis

Research output: Contribution to journalArticlepeer-review

96 Citations (SciVal)
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Recent theories in numerical cognition propose the existence of an approximate number system (ANS) that supports the representation and processing of quantity information without symbols. It has been claimed that this system is present in infants, children, and adults, that it supports learning of symbolic mathematics, and that correctly harnessing the system during tuition will lead to educational benefits. Various experimental tasks have been used to investigate individuals' ANSs, and it has been assumed that these tasks measure the same system. We tested the relationship across six measures of the ANS. Surprisingly, despite typical performance on each task, adult participants' performances across the tasks were not correlated, and estimates of the acuity of individuals' ANSs from different tasks were unrelated. These results highlight methodological issues with tasks typically used to measure the ANS and call into question claims that individuals use a single system to complete all these tasks.
Original languageEnglish
Pages (from-to)2099-2109
Number of pages11
JournalQuarterly Journal of Experimental Psychology
Issue number11
Early online date17 Aug 2011
Publication statusPublished - 2011


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