Neurolinguistic aspects of attrition

The aim of this paper is to provide the reader with a general overview of the field of attrition. Having situated this relatively new research domain with respect to related fields and approaches, a brief summary of the most important research questions and preliminary findings is given. The discussion then focuses on two issues that are of particular interest with respect to neurolinguistics: the role of the subject's age and of the influence of L2. Concerning the former, a summary of research on the critical period hypothesis is given and discussed in the light of findings from attrition research. Another issue concerns the principal mechanisms involved in L1 attrition, i.e. whether attrition occurs because of lack of L1 use or because of its replacement by the competing L2 structures. Research issues of such scope need integrative approaches and greatly benefit from comparisons with related fields such as normal aging, acquisition and aphasia. (C) 2003 Elsevier Ltd. All rights reserved.