a École de psychologie and CIRRIS and CRULRG, Université Laval, Québec, Que., Canada
b Département de Stomatologie, Université de Montréal, Montréal, Que., Canada
c Department of Psychology and Center for Cognitive and Social Neuroscience, The University of Chicago, Chicago, IL, USA
*Corresponding author. Tel.: +1 418 656 2131 ext.5151; fax: +1 418 529 3548.
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Submitted July 17, 2006; revised September 6, 2006; accepted September 8, 2006.