Gary Libben is Professor of Linguistics and Director of the Centre for Comparative Psycholinguistics at the University of Alberta. He is the co-author, with M. Paradis, of The Assessment of Bilingual Aphasia (Erlbaum, 1987) and, with J. Archibald, of Research Perspectives on Second Language Acquisition (Copp, Clark, Pitman, 1995). Gonia Jarema is Professor of Linguistics at the University of Montreal and Director of the Mental Lexicon Laboratory at the Research Centre of the Institut universitaire de geriatrie de Montreal. She specializes in the psycho- and neurolinguistics of the menta...