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Specifically, both the power and the phase of oscillations in the alpha\u2010frequency band (9\u201313\u00a0Hz) have been reported to predict the detection of visual stimuli. Up to now, the functional mechanisms underlying pre\u2010stimulus power and phase effects on upcoming visual percepts are debated. Here, we used magnetoencephalography recordings together with a near\u2010threshold visual detection task to investigate the neural generators of pre\u2010stimulus power and phase and their impact on subsequent visual\u2010evoked responses. Pre\u2010stimulus alpha\u2010band power and phase opposition effects were found consistent with previous reports. Source localization suggested clearly distinct neural generators for these pre\u2010stimulus effects: Power effects were mainly found in occipital\u2010temporal regions, whereas phase effects also involved prefrontal areas. In order to be functionally relevant, the pre\u2010stimulus correlates should influence post\u2010stimulus processing. Using a trial\u2010sorting approach, we observed that only pre\u2010stimulus power modulated the Hits versus Misses difference in the evoked response, a well\u2010established post\u2010stimulus neural correlate of near\u2010threshold perception, such that trials with stronger pre\u2010stimulus power effect showed greater post\u2010stimulus difference. By contrast, no influence of pre\u2010stimulus phase effects were found. In sum, our study shows distinct generators for two pre\u2010stimulus neural patterns predicting visual perception, and that only alpha power impacts the post\u2010stimulus correlate of conscious access. This underlines the functional relevance of prestimulus alpha power on perceptual awareness, while questioning the role of alpha phase.<\/jats:p>","DOI":"10.1111\/ejn.15138","type":"journal-article","created":{"date-parts":[[2021,2,5]],"date-time":"2021-02-05T12:58:56Z","timestamp":1612529936000},"page":"3178-3190","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":47,"title":["Pre\u2010stimulus alpha\u2010band power and phase fluctuations originate from different neural sources and exert distinct impact on stimulus\u2010evoked responses"],"prefix":"10.1111","volume":"55","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-1395-9005","authenticated-orcid":false,"given":"Agnese","family":"Zazio","sequence":"first","affiliation":[{"name":"Neurophysiology Lab IRCCS Istituto Centro San Giovanni di Dio Fatebenefratelli  Brescia 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