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- Iro Xenidou-Dervou, Ernest C. D. M. van Lieshout, Menno van der Schoot
- Cognitive Science
- 2014

Preschool children have been proven to possess nonsymbolic approximate arithmetic skills before learning how to manipulate symbolic math and thus before any formal math instruction. It has been assumed that nonsymbolic approximate math tasks necessitate the allocation of Working Memory (WM) resources. WM has been consistently shown to be an important… (More)

- Iro Xenidou-Dervou, Camilla K. Gilmore, Menno van der Schoot, Ernest C. D. M. van Lieshout
- Front. Psychol.
- 2015

Symbolic (i.e., with Arabic numerals) approximate arithmetic with large numerosities is an important predictor of mathematics. It was previously evidenced to onset before formal schooling at the kindergarten age (Gilmore et al., 2007) and was assumed to map onto pre-existing nonsymbolic (i.e., abstract magnitudes) representations. With a longitudinal study… (More)

- Iro Xenidou-Dervou, Menno van der Schoot, Ernest C. D. M. van Lieshout
- Quarterly journal of experimental psychology
- 2015

How do kindergarteners solve different single-digit addition problem formats? We administered problems that differed solely on the basis of two dimensions: response type (approximate or exact), and stimulus type (nonsymbolic, i.e., dots, or symbolic, i.e., Arabic numbers). We examined how performance differs across these dimensions, and which cognitive… (More)

Kindergarteners can conduct basic computations with large nonsymbolic (e.g. dots, objects) and symbolic (i.e. Arabic numbers) numerosities in an approximate manner. These abilities are related to individual differences in mathematics achievement. At the same time, these individual differences are also determined by Working Memory (WM). The interrelationship… (More)

- Ilona Friso-van den Bos, Evelyn H. Kroesbergen, +4 authors Ernest C. D. M. van Lieshout
- Journal of experimental child psychology
- 2015

Children's ability to relate number to a continuous quantity abstraction visualized as a number line is widely accepted to be predictive of mathematics achievement. However, a debate has emerged with respect to how children's placements are distributed on this number line across development. In the current study, different models were applied to children's… (More)

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