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Recognition responses to stimuli that are similar to those observed previously can hint at the fidelity of the memories or point to processes of generalization at the expense of precise memory representations. Experimental studies utilizing this approach showed that emotions and sleep both influence these responses. Sleep, and more specifically rapid eye movement sleep, is assumed to facilitate the generalization of emotional memories. We studied mnemonic discrimination by the emotional variant of the Mnemonic Separation Task in participants (<jats:italic>N<\/jats:italic>\u2009=\u2009113) who spent a daytime nap between learning and testing compared with another group that spent an equivalent time awake between the two sessions. Our findings indicate that the discrimination of similar but previously not seen items from previously seen ones is enhanced in case of negative compared with neutral and positive stimuli. Moreover, whereas the sleep and the wake groups did not differ in memory performance, participants entering rapid eye movement sleep exhibited increased generalization of emotional memories. Our findings indicate that entering into rapid eye movement sleep during a daytime nap shapes emotional memories in a way that enhances recognition at the expense of detailed memory representations.<\/jats:p>","DOI":"10.1111\/jsr.14177","type":"journal-article","created":{"date-parts":[[2024,2,19]],"date-time":"2024-02-19T08:33:29Z","timestamp":1708331609000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":4,"title":["A daytime nap with <scp>REM<\/scp> sleep is linked to enhanced generalization of emotional stimuli"],"prefix":"10.1111","volume":"33","author":[{"given":"Rich\u00e1rd","family":"Reichardt","sequence":"first","affiliation":[{"name":"Institute of Psychology E\u00f6tv\u00f6s Lor\u00e1nd University  Budapest Hungary"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Anna","family":"Kir\u00e1ly","sequence":"additional","affiliation":[{"name":"National Institute of Locomotor Diseases and Disabilities  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