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. 2013 Jan 3;3:583. doi: 10.3389/fpsyg.2012.00583

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Copyright © 2013 Bemis and Pylkkänen.

This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in other forums, provided the original authors and source are credited and subject to any copyright notices concerning any third-party graphics etc.

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Mathematical ROI results. Localized activity is again shown for the three linguistic ROIs – the left ATL (A), vmPFC (B), and left AG (C) – and one ROI – the IPS (D) – intended to capture canonical effects related to mathematical processing. The shaded region denotes a significant cluster of increased activity in the IPS during basic addition, as identified by a permutation test (Maris and Oostenveld, 2007). The boxed region in the left ATL ROI denotes a significant main effect cluster for which activity was greater in both two-numeral conditions compared to their corresponding one-numeral control. The boxed region in the left AG ROI denotes a period of increased activity across all conditions. This activity, however, was not significantly different between any of the four conditions. ns, Non-significant; *p < 0.05; **p < 0.01.