International Symposium on Bilingualism Lecture
The present paper summarizes research showing that bilingualism affects linguistic and cognitive performance across the lifespan. The effect on linguistic performance is generally seen as a deficit in which bilingual children control a smaller vocabulary than their monolingual peers and bilingual adults perform more poorly on rapid lexical retrieval tasks. The effect on cognitive performance is to enhance executive functioning and to protect against the decline of executive control in aging. These effects interact to produce a complex pattern regarding the effect of bilingualism on memory performance. Memory tasks based primarily on verbal recall are performed more poorly by bilinguals but memory tasks based primarily on executive control are performed better by bilinguals. Speculations regarding the mechanism responsible for these effects are described.
(Received January 07 2008)
(Accepted January 27 2008)
* The research reported in this chapter was funded by grants from the Natural Sciences and Engineering Research Council of Canada (NSERC), the National Institutes of Health (NIH), and the Canadian Institutes for Health Research (CIHR). The paper is based on a plenary address given at the International Symposium on Bilingualism, University of Hamburg, 30 May – 2 June 2007.