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Department of Psychology and the Center for Neurosciences, University of Colorado at Boulder, Boulder, CO 80309-0345, USA *Corresponding author. Tel.: +1-303-492-7034; fax: +1-303-492-2967 E-mail: email protected Submitted June 1, 2001; accepted June 12, 2001.
Watkins et al. (Sat,) studied this question.