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Through a double\u2010blind crossover study, we investigated the effects of dual\u2010site beta transcranial alternating current stimulation (tACS) over the right inferior frontal gyrus (rIFG) and pre\u2010supplementary motor area (preSMA) on functional connectivity measured with electroencephalography and response inhibition (stop\u2010signal task performance) in 15 older (aged 61\u201379\u2009years) and 18 young (aged 18\u201334\u2009years) adults. Two tACS conditions were administered in separate sessions: in\u2010phase tACS, where electrical currents delivered to rIFG and preSMA had a 0\u00b0 phase difference, and anti\u2010phase tACS, where currents had a 180\u00b0 phase difference. Resting\u2010state beta band rIFG\u2010preSMA connectivity significantly increased after in\u2010phase tACS for older and young adults and decreased after anti\u2010phase tACS for older adults. Response inhibition significantly improved after both in\u2010 and anti\u2010phase tACS for young and older adults. These findings suggest that tACS can potentially modulate rIFG\u2010preSMA connectivity in a phase\u2010specific manner in the aging brain, and that inhibitory performance might not be directly regulated by resting\u2010state rIFG\u2010preSMA phase connectivity. Due to the lack of sham control, placebo effects cannot be ruled out. However, the differing neurophysiological effects from in\u2010 and anti\u2010phase tACS suggest that rIFG\u2010preSMA resting\u2010state phase connectivity is unlikely to underpin the changes in inhibitory performance. Future studies incorporating a sham control are required to verify these findings.<\/jats:p>","DOI":"10.1111\/psyp.70060","type":"journal-article","created":{"date-parts":[[2025,5,5]],"date-time":"2025-05-05T11:50:56Z","timestamp":1746445856000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":10,"title":["Dual\u2010Site Beta <scp>tACS<\/scp> Over the <scp>rIFG<\/scp> and <scp>preSMA<\/scp>\u2010Induced Phase\u2010Specific Changes in Functional Connectivity but not Response Inhibition Performance in Older Adults"],"prefix":"10.1111","volume":"62","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-0826-5391","authenticated-orcid":false,"given":"Jane","family":"Tan","sequence":"first","affiliation":[{"name":"School of Psychology, College of Health and Education Murdoch University  Perth Western Australia Australia"},{"name":"Centre for Healthy Ageing, Health Futures Institute Murdoch University  Perth Western Australia 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