Fig. 4.

Intra-class Spearman correlations for cortical curvature (A), and thickness (B). MZ twin pair correlations are plotted against those for DZ twins. The dashed line is the identity line. Error bars denote 95% confidence intervals derived through 10,000 bootstrap samples. C. Correlation difference estimates for these anatomical parameters in each visual region. Data are shown for cortical curvature and thickness, as derived from surface reconstruction in FreeSurfer. Filled circles indicate the group means. The violin plot shows the bootstrap distribution for each pRF property and visual region, and the error bars denote 95% confidence intervals. Asterisks indicate significant differences at p < 0.05, after Bonferroni correction for multiple comparisons.