An fMRI study of magnitude comparison and exact addition in children.
An fMRI study of magnitude comparison and exact addition in children.
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DOI：
10.1016/j.mri.2009.11.010
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发表时间：
2010-04
影响因子：
2.5
通讯作者：
Jacobson, Joseph L.
中科院分区：
文献类型：
--
作者：
Meintjes, Ernesta M.;Jacobson, Sandra W.;Molteno, Christopher D.;Gatenby, J. Christopher;Warton, Christopher;Cannistraci, Christopher J.;Gore, John C.;Jacobson, Joseph L.
关键词：
By contrast to the adult literature, in which a consistent parieto-frontal network for number processing has been identified, the data from studies of number processing in children have been less consistent, probably due to differences in study design and control conditions. Number processing was examined using functional MRI in 18 right-handed children (8–12 years) from the Cape Coloured community in Cape Town, South Africa using Proximity Judgment (PJ) and Exact Addition (EA) tasks. The findings were consistent with the hypothesis that, as in adults, the anterior horizontal intraparietal sulcus (HIPS) plays a major role in the representation and manipulation of quantity in children. The posterior medial frontal cortex, believed to be involved in performance monitoring in more complex arithmetic manipulations in adults, was extensively activated even for relatively simple symbolic number processing in the children. Other areas activated to a greater degree in the children included the left precentral sulcus, which may mediate number knowledge, and, for EA, the head of the caudate nucleus, which is part of a fronto-subcortical circuit involved in the behavioral execution of sequences. Two regions that have been linked to number processing in adults—the angular gyrus and posterior superior parietal lobule—were not activated in the children. The data are consistent with the inference that, although the functional specialization of the anterior HIPS may increase as symbolic number processing becomes increasingly automatic, this region and other elements of the parieto-frontal network identified in adults are already reliably and robustly activated by middle childhood.
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影响因子：
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通讯作者：
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