“…Although a few studies have reported a male advantage in spatial ability in young children, the age at which this sex difference emerges appears to depend on the nature of the spatial ability tested (see Voyer et al, 1995). Specifically, sex differences have been found in preschool children, but these have primarily occurred in tasks that required mental transformations of objects, such as mental rotation (Rosser, Ensing, Gilder, & Lane, 1984), 3-D puzzle tasks (McGuinness & Morley, 1991), and spatial transformation tasks (Levine, Huttenlocher, Taylor, & Langrock, 1999). In other kinds of spatial tasks, sex differences have typically not been seen in preschool children (see, e.g., Uttal, Gregg, Tan, Chamberlin, & Sines, 2001;Vasilyeva & Huttenlocher, 2004).…”