“…Stereopsis is not present at birth but appears by approximately 4 months of age in most human infants (Birch & Petrig, 1996;Birch, Shimojo, & Held, 1985;Fawcett, Wang, & Birch, 2005;Shea, Fox, Aslin, & Dumais, 1980;Takai, Sato, Tan, & Hirai, 2005). Binocular fusion follows a similar time course (Birch & Petrig, 1996;.…”