In August 1996, a number of researchers converged on Jyväskylä, Finland, to participate in an Association Internationale de Linguistique Appliquée (AILA) symposium entitled "New Perspectives on the Critical Period for Second Language Acquisition". Under this banner, the participants took aim at the question of whether, or to what extent, a critical period limits the acquisition of a first language as well as a second language acquired postpubertally. Attendance at the symposium, as well as discussion, was robust. So, too, was the enthusiasm to use the presentations as a nucleus for the present volume.
As major players in this debate, the participants were well aware that positions on this issue run the gamut from outright rejection to empassioned acceptance. It is a question that has been approached by researchers working in linguistic theory, evolution theory, language processing, and neurophysiology, to name but a few of the relevant disciplines. The Critical Period Hypothesis for Second Language Acquisition (CPH-L2A) has spawned an abundance of data, ranging from grammaticality judgments to speech samples to Event-Related Brain Potentials. These data have lent themselves to interpretation in many ways: for example, as consistent with theories of access (or lack of access) to Universal Grammar; as suggesting post-maturational age effects and cross-linguisic (transfer) effects; and as evidence for the tremendous diversity of learner outcomes, ranging from little progress to nativelike mastery.
This diversity is represented in this volume. In addition, I have sought inquiry that cuts across several sub-disciplines of linguistics -- phonetics, phonology, lexis, syntax, morphology -- and that embraces modern sciences with such prefixes as psycho- and neuro- . I have aimed for an informative mixture of theory, evidence, and cautious argumentation. Finally, the contributions to the book are equally divided between the pro-CPH-L2A and the anti-CPH-L2A positions.
In these respects this book sets itself apart from other treatments of the CPH-L2A. By its breadth of inquiry, the volume should appeal to a