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The topic of this bibliography in its broadest sense is the subject of a wide range of academic disciplines. Given these circumstances, the particular associations and connotations of the terms 'transfer' and 'interference' in each of these areas are legion, with resultant differences in meaning in the disparate literature on these subjects. And yet it is, in one way or another, contact and interaction of languages in the speaker/hearer and learner, in language acquisition contexts, as well as in society in general, which is basic to these two concepts throughout the various disciplines. The discovery of this basic unitary notion is surely one of the reasons for the new interest in these phenomena. In light of all this, a bibliography cannot at present avoid being highly/ selective in order to demarcate an interdisciplinary area of research in its own right and with its own status. The establishment of such an area is one of our main aims. The focus of interest in this bibliography, admittedly, is directed towards the psycholinguistics of language contact and interaction.

This volume features the complete text of the material presented at the Twentieth Annual Conference of the Cognitive Science Society. As in previous years, the symposium included an interesting mixture of papers on many topics from researchers with diverse backgrounds and different goals, presenting a multifaceted view of cognitive science. This volume contains papers, posters, and summaries of symposia presented at the leading conference that brings cognitive scientists together to discuss issues of theoretical and applied concern. Submitted presentations are represented in these proceedings as "long papers" (those presented as spoken presentations and "full posters" at the conference) and "short papers" (those presented as "abstract posters" by members of the Cognitive Science Society).