Fig. 2

Coefficent of asymmetry histogram for the unconstrained sample (n = 50): a planum temporale, b planum polare, c Heschl’s gyrus, and d posterior superior temporal gyrus. The coefficient was calculated as ([2(R−L)/R+L)], after [35]), and values range from −1.0 to 1.0, with negative values reflecting leftward asymmetry