Submitted on: 13 December 1999.
Revised on: 03 January 2000.
Accepted on: 10 February 2000.
___________________BEHAVIORAL AND BRAIN SCIENCES---CAMBRIDGE UNIV PRESS
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Submitted on: 27 May 2001.
Revised on: 12 August 2001.
Accepted on: 29 September 2001.
___________________BEHAVIORAL AND BRAIN SCIENCES---CAMBRIDGE UNIV PRESS
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Submitted on: 12 December 2006.
Revised on: 09 April 2007.
Accepted on: 01 June 2007.
___________________BEHAVIORAL AND BRAIN SCIENCES---CAMBRIDGE UNIV PRESS
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Submitted on: 24 December 2000.
Revised on: 18 March 2001.
Accepted on: 08 May 2001.
___________________BEHAVIORAL AND BRAIN SCIENCES---CAMBRIDGE UNIV PRESS
Submitted on: 19 July 2009.
Revised on: 12 October 2009.
Accepted on: 23 November 2009.
___________________BEHAVIORAL AND BRAIN SCIENCES---CAMBRIDGE UNIV PRESS