One, two, three, four, nothing more: an investigation of the conceptual sources of the verbal counting principles. Corre, M. L. & Carey, S. Cognition, 105(2):395-438, 2007.
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Since the publication of [Gelman, R., & Gallistel, C. R. (1978). The child's understanding of number. Cambridge, MA: Harvard University Press.] seminal work on the development of verbal counting as a representation of number, the nature of the ontogenetic sources of the verbal counting principles has been intensely debated. The present experiments explore proposals according to which the verbal counting principles are acquired by mapping numerals in the count list onto systems of numerical representation for which there is evidence in infancy, namely, analog magnitudes, parallel individuation, and set-based quantification. By asking 3- and 4-year-olds to estimate the number of elements in sets without counting, we investigate whether the numerals that are assigned cardinal meaning as part of the acquisition process display the signatures of what we call "enriched parallel individuation" (which combines properties of parallel individuation and of set-based quantification) or analog magnitudes. Two experiments demonstrate that while "one" to "four" are mapped onto core representations of small sets prior to the acquisition of the counting principles, numerals beyond "four" are only mapped onto analog magnitudes about six months after the acquisition of the counting principles. Moreover, we show that children's numerical estimates of sets from 1 to 4 elements fail to show the signature of numeral use based on analog magnitudes - namely, scalar variability. We conclude that, while representations of small sets provided by parallel individuation, enriched by the resources of set-based quantification are recruited in the acquisition process to provide the first numerical meanings for "one" to "four", analog magnitudes play no role in this process.
@Article{Corre2007,
  author   = {Mathieu Le Corre and Susan Carey},
  journal  = {Cognition},
  title    = {One, two, three, four, nothing more: an investigation of the conceptual sources of the verbal counting principles.},
  year     = {2007},
  number   = {2},
  pages    = {395-438},
  volume   = {105},
  abstract = {Since the publication of [Gelman, R., & Gallistel, C. R. (1978). The
	child's understanding of number. Cambridge, MA: Harvard University
	Press.] seminal work on the development of verbal counting as a representation
	of number, the nature of the ontogenetic sources of the verbal counting
	principles has been intensely debated. The present experiments explore
	proposals according to which the verbal counting principles are acquired
	by mapping numerals in the count list onto systems of numerical representation
	for which there is evidence in infancy, namely, analog magnitudes,
	parallel individuation, and set-based quantification. By asking 3-
	and 4-year-olds to estimate the number of elements in sets without
	counting, we investigate whether the numerals that are assigned cardinal
	meaning as part of the acquisition process display the signatures
	of what we call "enriched parallel individuation" (which combines
	properties of parallel individuation and of set-based quantification)
	or analog magnitudes. Two experiments demonstrate that while "one"
	to "four" are mapped onto core representations of small sets prior
	to the acquisition of the counting principles, numerals beyond "four"
	are only mapped onto analog magnitudes about six months after the
	acquisition of the counting principles. Moreover, we show that children's
	numerical estimates of sets from 1 to 4 elements fail to show the
	signature of numeral use based on analog magnitudes - namely, scalar
	variability. We conclude that, while representations of small sets
	provided by parallel individuation, enriched by the resources of
	set-based quantification are recruited in the acquisition process
	to provide the first numerical meanings for "one" to "four", analog
	magnitudes play no role in this process.},
  doi      = {10.1016/j.cognition.2006.10.005},
  keywords = {Awareness, Child, Comprehension, Concept Formation, Female, Humans, Language Development, Male, Mathematics, Preschool, Problem Solving, Verbal Behavior, 17331490},
}

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