Fig. 2: Spatial variability in between-hemisphere functional distance reflects hemispheric functional specialization across multiple tasks.
From: Functional divergence between the two cerebral hemispheres contributes to human fluid intelligence
a We calculated the cortical map of the overall functional lateralization index across all 575 cognitive terms. A significant correlation between the cortical map of overall functional lateralization and the between-hemisphere functional distance map was found by a spin test with 10,000 permutations. The shaded region around each line indicates the 95% confidence interval (CI). b Then we used Neurosynth’s ROI association approach of regions of interest along the between-hemisphere functional distance map with 24 topic terms. The terms were ordered by the positively weighted mean of their location along the left and right hemisphere. c To visualize the hemispheric difference in topic term-based decoding results between the left and right hemispheres, we calculated the deviation of the correction coefficient (left–right) for each topic term within corresponding 5-percentile bin. The pattern of deviation reveals a general transition from weak to strong divergence in lateralization across cognitive functions, including leftward lateralization associated with language and rightward lateralization associated with visual attention.
