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RPE
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Reward Prediction Error ([[RPE]]), is thought to be a the activator of learning when ther is a difrence between accepted reward and actual reward<ref>[http://www.pnas.org/content/early/2011/03/08/1014269108.full.pdf article 2011 PNAS]</ref>. but it is much debated<ref>[http://www.ncbi.nlm.nih.gov/pubmed/17115078?dopt=Abstract article 2007]</ref>.
It may be correlated to [[novelty seeking]] and activation of [[system 2]]