期刊
NEUROSCIENCE AND BIOBEHAVIORAL REVIEWS
卷 78, 期 -, 页码 145-160出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.neubiorev.2017.04.027
关键词
Meta-analysis; Activation likelihood estimation; Symbolic number; Number form; Parietal cortex; Frontal cortex; Inferior temporal gyrus
资金
- Humanities, Arts, and Social Sciences International PhD Scholarship
- Nanyang Technological University
- Ministry of Education (Singapore)
Recent studies report a putative number form area (NFA) in the inferior temporal gyrus (ITG) suggested to be specialized for Arabic numeral processing. However, a number of earlier studies report no such NFA. The reasons for such discrepancies across studies are unclear. To examine evidence for a convergent NFA across studies, we conducted two activation likelihood estimation meta-analyses on 31 and a subset of 20 neuroimaging studies that have contrasted digits with other meaningful symbols. Results suggest the potential existence of an NFA in the right ITG, in addition to a 'symbolic number processing network' comprising bilateral parietal regions, and right-lateralized superior and inferior frontal regions. Critically, convergent localization for the NFA was only evident when contrasts were appropriately controlled for task demands, and does not appear to depend on employing methods designed to overcome fMRI signal dropout in the ITG. Importantly, only five studies had foci within the identified ITG NFA cluster boundary, indicating that more empirical evidence is necessary to determine the true functional specialization and regional specificity of the putative NFA.
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