Regions showing positive correlation between GM density and shyness scores without using anxiety scores as covariates.

Shyness scores are positively correlated with GM density in the bilateral superior temporal gyri and parahippocampal gyri, and also in the right insula and left cerebellum posterior lobe, when age, gender, and total intracranial volume are used as covariants (at a cluster lever with family wise corrected at p<0.05). Scatter plots show correlations between regional density in left cerebellum posterior lobe and right superior temporal gyrus and shyness and social anxiety scores. Images are presented in radiological orientation. Hot colors indicate brain regions with significant positive correlations with shyness.