Most brain volumes in adults are significantly heritable (Baare et al. 2001; Posthuma et al. 2000; Tramo et al. 1998; Wright et al. 2002). Variation of cortical thickness in some regions such as the frontal and superior temporal lobes appears have a significant genetic contribution, while in other regions environmental factors are more pronounced (Rimol et al. 2010; Thompson et al. 2001). Topological features such as gyrification, by contrast, have thus far appeared to show stronger environmental influences (White et al. 2002).
