“…Given the difficulties detecting depression in ASD, coupled with the possibility of under-diagnosis (Frazier, Doyle, Chiu, & Coyle, 2002;Hill et al, 2004;Lainhart & Folstein, 1994), further investigations should include behavioural assessments. Increases in obsessive-compulsive behaviours, intensified ruminations and preservations, increased social withdrawal and sleep disturbances may all indicate the onset of depression (Ghaziuddin et al, 2002).…”