Measuring toddlers non-symbolic number processing
Much research has investigated children’s non-symbolic number processing and its relation to mathematical ability. However, surprisingly few studies have investigated performance in 18-36 month-olds, where symbolic number concepts begin to emerge, and the extent results indicate poor performance. We tested 74 2 - 3.5 year-olds recruited from two sites (Ulster and Uppsala). They completed a novel dot-comparison task where children were shown, but not verbally instructed, how pushing a more numerous array resulted in reward and a Give-N task. Overall, participants performed above chance on the dot comparison task, indicating that non-symbolic number processing skills can be measured in toddlers without verbal instructions. We found no relation between performance on the non-symbolic number processing task and knower-level. Our results warrant two conclusions. First, verbal instructions involving the concept of more are not necessary to measure non-symbolic number processing skills in young children. Second, the development of a symbolic number concept seems independent of the development of non-symbolic comparison skills but may become artificially related when researchers use quantifiers such as “more” to measure the former.