Submitted on: 01 January 2015.
Revised on: 26 January 2015.
Accepted on: 24 February 2015.
___________________BIOLOGICAL PSYCHOLOGY---ELSEVIER
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Submitted on: 27 February 2014.
Revised on: 22 March 2014.
Accepted on: 12 April 2014.
___________________BIOLOGICAL PSYCHOLOGY---ELSEVIER
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