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Although participants could not explicitly tell the difference between these two conditions, the introduced regularity affected both performance and the pattern of brain activation. The \u201cNo-Reference\u201d condition induced a larger activation in frontoparietal areas known to be part of the working memory network. However, only the condition with a reference showed fast learning, which was accompanied by a reduction of activity in two regions: the left intraparietal area, involved in stimulus retention, and the posterior superior-temporal area, involved in representing auditory regularities. We propose that this joint reduction reflects a reduction in the need for online storage of the compared tones. We further suggest that this change reflects an implicit strategic shift \u201cbackwards\u201d from reliance mainly on working memory networks in the \u201cNo-Reference\u201d condition to increased reliance on detected regularities stored in high-level auditory networks.<\/jats:p>","DOI":"10.1162\/jocn_a_00786","type":"journal-article","created":{"date-parts":[[2015,1,20]],"date-time":"2015-01-20T14:02:38Z","timestamp":1421762558000},"page":"1308-1321","update-policy":"https:\/\/doi.org\/10.1162\/mitpressjournals.corrections.policy","source":"Crossref","is-referenced-by-count":16,"title":["Fast Learning of Simple Perceptual Discriminations Reduces Brain Activation in Working Memory and in High-level Auditory 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