Journal
FRONTIERS IN HUMAN NEUROSCIENCE
Volume 9, Issue -, Pages -Publisher
FRONTIERS MEDIA SA
DOI: 10.3389/fnhum.2015.00227
Keywords
brain connectivity; DTI; white matter pathways; fronto-parietal network; numerical cognition
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Funding
- Leibniz-Competition Fund (SAW) [SAW-2014-IWM-4]
- German Research Foundation (DUG) [WI 1804/6-1, MO 2525/2-1]
- LEAD Graduate School of the University of Tiibingen within Excellence Initiative via German Research Foundation
- Cooperative Research Training Group of the University of Education, Ludwigsburg
- Ministry of Science, Research and Arts in Baden-Wurttemberg
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Only recently has the complex anatomo-functional system underlying numerical cognition become accessible to evaluation in the living brain. We identified 27 studies investigating brain connectivity in numerical cognition. Despite considerable heterogeneity regarding methodological approaches, populations investigated, and assessment procedures implemented, the results provided largely converging evidence regarding the underlying brain connectivity involved in numerical cognition. Analyses of both functional/effective as well as structural connectivity have consistently corroborated the assumption that numerical cognition is subserved by a frontoparietal network including (intra)parietal as well as (pre)frontal cortex sites. Evaluation of structural connectivity has indicated the involvement of fronto-parietal association fibers encompassing the superior longitudinal fasciculus dorsally and the external capsule/extreme capsule system ventrally. Additionally, commissural fibers seem to connect the bilateral intraparietal sulci when number magnitude information is processed. Finally, the identification of projection fibers such as the superior corona radiata indicates connections between cortex and basal ganglia as well as the thalamus in numerical cognition. Studies on functional/effective connectivity further indicated a specific role of the hippocampus. These specifications of brain connectivity augment the triple-code model of number processing and calculation with respect to how gray matter areas associated with specific number related representations may work together.
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