 It is generally agreed that congenital CMV infection, whether it is symptomatic or not, is a major risk factor for perceptual deficits. However, its influence on childrens future neuropsychological functioning is less well established. Symptomatic congenital CMV infection is a major risk factor for poor developmental outcome Williamson 1982, Kylat 2006, Dollard 2007, but the available data regarding neuropsychological outcome for asymptomatic children is extremely diverse Conboy 1986, Ivarson 1997, Kashdan 1998, Temple 2000, Zhang 2007. 