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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 difference 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 debated<ref>[http://www.ncbi.nlm.nih.gov/pubmed/17115078?dopt=Abstract article 2007]</ref>.
It may be correlated to to [[novelty seeking]] and activation of of [[system 2]] Learning is induced because of surprise. The d[[ACC]] is concerned more with attention and motor control processes involved in behavioral adjustment. The dopamine [[RPE]] system is the process from which a learning is happening<ref>Benjamin Y. Hayden1,2, Sarah R. Heilbronner, John M. Pearson, and Michael L. Platt, Surprise Signals in Anterior Cingulate Cortex: Neuronal Encoding of Unsigned Reward Prediction Errors Driving Adjustment in Behavior, ''The Journal of Neuroscience'', 16 March 2011, 31(11): 4178-4187</ref>.