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We assessed whether adaptive training in Modern Standard Arabic improves TCS perception and whether training-related gains extend to novel items and to a related but acoustically distinct speech form (spoken Palestinian Arabic). Fifty-one participants took part in the study: 13 young adults (20\u201330\u2009years) and 12 older adults (55\u201365\u2009years) completed four training sessions, while age-matched controls (13 young, 13 older) received no training. Two additional sessions assessed generalization. Both trained groups showed significant improvement in TCS perception compared to controls, demonstrating robust auditory learning despite baseline differences. Learning gains generalized to untrained content within the trained speech form, but transfer to the alternate speech form was limited, highlighting that generalization may be tied to the acoustic\u2013phonetic structure of the trained form. These preliminary results offer new evidence on age-independent constraints in perceptual learning and can inform more tailored clinical assessment and intervention strategies.<\/jats:p>","DOI":"10.1121\/10.0044377","type":"journal-article","created":{"date-parts":[[2026,7,31]],"date-time":"2026-07-31T12:14:48Z","timestamp":1785500088000},"page":"875-886","update-policy":"https:\/\/doi.org\/10.1063\/aip-crossmark-policy-page","source":"Crossref","is-referenced-by-count":0,"title":["Auditory learning of time-compressed speech reveals acoustic\u2013phonetic constraints on generalization across age groups"],"prefix":"10.1121","volume":"160","author":[{"given":"Marah","family":"Alazzeh","sequence":"first","affiliation":[{"name":"The Department of Communication Disorders, Steyer School of Health Professions, Gray Faculty of Medical & Health Sciences, Tel Aviv University 1 ,","place":["Israel"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0927-0528","authenticated-orcid":false,"given":"Yael","family":"Zaltz","sequence":"additional","affiliation":[{"name":"The Department of Communication Disorders, Steyer School of Health Professions, Gray Faculty of Medical & Health Sciences, Tel Aviv University 1 ,","place":["Israel"]},{"name":"Sagol School of Neuroscience, Tel Aviv University 2 ,","place":["Israel"]}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"231","published-online":{"date-parts":[[2026,7,31]]},"reference":[{"key":"2026073108144304500_c1","unstructured":"Abdulhaq, A. 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