“…The most reliably measured deficits in early autism are those in social areas such as joint attention, communication and imitation. In fact, perhaps the most reliably measurable deficits in autism is a deficit in joint attention (Baron-Cohen, 1989, 1995Buitelaar, van Engeland, de Kogel, de Vries, & van Hoof, 1991;Mundy et al, 1986;Mundy & Sigman, 1989), and this deficit appears as early as 18 months (Baron-Cohen, Allen, & Gillberg, 1992) or even 12 months (Osterling & Dawson, 1994). Social dysfunction in autism may have its roots in social perceptual difficulties.…”