alities, notably schizophrenia (Chance et al., 2008; Schobel et al., 2009; Wolf et al., 2008) and fronto-temporal dementia (Boccardi et al., 2003; Jeong et al., 2005; Kanda et al., 2008; Whitwell et al., 2005). The findings presented in this paper may help shed further light on the nature and implications