Neuroimaging work has found that
children with autism aged 2 to 4 had larger brains
with more cerebral and cerebellar white matter and more cerebral cortical grey matter than typically developing children of the same age (Courchesne et al., 2001). However, Carper and colleagues (e.g., Carper et al., 2002) found that children with autism gain substantially less grey and white matter in the frontal lobes from early to late childhood relative to typically developing children.