Magnitude representations in Williams syndrome : differential acuity in time, space and number processing
(2013) PLoS One — Vol. 8, n° 8, p. e72621 [1-13] (2013)
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- For some authors, the human sensitivity to numerosities would be grounded in our ability to process non-numerical magnitudes. In the present study, the developmental relationships between non numerical and numerical magnitude processing are examined in people with Williams syndrome (WS), a genetic disorder known to associate visuo-spatial and math learning disabilities. Twenty patients with WS and 40 typically developing children matched on verbal or non-verbal abilities were administered three comparison tasks in which they had to compare numerosities, lengths or durations. Participants with WS showed lower acuity (manifested by a higher Weber fraction) than their verbal matched peers when processing numerical and spatial but not temporal magnitudes, indicating that they do not present a domain-general dysfunction of all magnitude processing. Conversely, they do not differ from non-verbal matched participants in any of the three tasks. Finally, correlational analyses revealed that non-numerical and numerical acuity indexes were both related to the first mathematical acquisitions but not with later arithmetical skills.
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Rousselle, L., Dembour, G., & Noël, M.-P. (2013). Magnitude representations in Williams syndrome : differential acuity in time, space and number processing. PLoS One, 8(8), e72621 [1-13]. https://doi.org/10.1371/journal.pone.0072621 (Original work published 2013)