THE STRIKING image of Janus, the Roman god, seizes our imagination, as he is depicted with two faces, each gazing in opposite directions. With one set of eyes cast toward a rising sun and the other toward a setting sun, he was the god of beginnings but one who could also ensure good endings. For nearly a century, parents, educators, and scientists have, like Janus, been of two minds about the bilingual child, a phenomenon that is so pervasive that we have come to call it “the bilingual paradox” in our laboratory (Petitto et al. 2001). [End Page 4] As if with eyes cast toward the positive light of a rising sun, we freely marvel at the seemingly effortless ways that young children can acquire two or more languages simultaneously if exposed to them in early life. At the same time, with eyes cast toward the darker light of a setting sun, we view early simultaneous bilingual exposure suspiciously, fearing that exposing a young child to two languages too early may cause language delay and, worse, language confusion. Indeed, the general perspective that young children are somehow harmed by early bilingual exposure is reflected both in educational settings and in comments made by the many parents raising bilingual children who visit our laboratory. For example, the fear that exposing a child to another language too early may interrupt “normal” language development is reflected in contemporary educational practice, whereby children in many countries around the world receive their first formal schooling in the other majority language well after the developmentally crucial toddler years. As support for this practice, many have invoked the dreaded notion of “language contamination” that ostensibly results from early exposure to another language (e.g., Crawford 1999). Following this general spirit, parents visiting our laboratory often opt to “hold back” one of the family’s two languages in their child’s early life. They believe that it may be better to establish one language firmly before exposing their child to the family’s other language so as to avoid confusing the child. They also worry that very early bilingual language exposure may put their child in danger of never being as competent in either of the two languages as monolingual children are in one.
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