Program in Neuroscience/Psychology, 1107 W. Call Street, Florida State University, Tallahassee, FL 32306-4301, USA *Corresponding author. Tel.: +1 850 644 5741; fax: +1 850 644 9874. E-mail address:[email protected] Article history: Received 6 April 2011; Received in revised form 7 April 2011; Accepted 7 April 2011.
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Berkley et al. (2011) studied this question.
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