Fig. 4

Inter-hemispheric IPS connectivity is related to individual differences in mathematical ability. Higher math ability was associated with higher inter-hemispheric IPS connectivity. Line plots show HLM fits for target regions extracted from the connectivity analysis. Colored lines show individual participant data, with light blue to purple colors indicating individual differences (low to high) in mathematical ability as measured by the NumOps subtest of the WIAT-II. Black lines show models for a hypothetical participant with NumOps score of 105 (which was roughly the mean NumOps score in the studied sample)