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The current study sought to (1) describe endorsement of echolalia\u2010related items using parent\u2010, teacher\u2010, and clinician\u2010reports in a well\u2010validated sample of autistic youth and (2) characterize relations between echolalia and other key factors, including age, language ability, and repetitive behaviors. Participants (<jats:italic>n<\/jats:italic>\u2009=\u20092555, 4\u201317\u2009years, 13% female, 78% White) from the Simon Simplex Collection provided data from multi\u2010informant ratings of echolalia and related behaviors. Nine parent\u2010, clinician\u2010, and teacher\u2010report items were extracted from five measures to broadly capture echolalia through a composite score. Results indicated that as many as 90% of autistic individuals express echolalia at some point in their development. Hierarchical linear regression was conducted to evaluate relations between echolalia, verbal ability, and repetitive behaviors, controlling for age, sex, and autism severity. Results indicated the main effects of verbal ability and repetitive behaviors. A significant interaction qualified this main effect wherein age was negatively associated with echolalia for children with higher verbal ability, but not those with lower verbal ability, suggesting that adolescents with less generative speech may leverage echolalia as a communicative strategy. Echolalia was positively associated with repetitive behaviors across development. These associations support a dualistic interpretation of echolalia as functional communication and as a form of repetitive behavior. Future research is needed to understand the developmental trajectories of echolalia and develop affirming support for this autistic behavior.<\/jats:p>","DOI":"10.1002\/aur.3298","type":"journal-article","created":{"date-parts":[[2025,1,7]],"date-time":"2025-01-07T09:30:08Z","timestamp":1736242208000},"page":"528-540","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":2,"title":["Reports of Echolalia and Related Behaviors in Autism From Parents, Teachers, and Clinicians: Evidence From the Simon Simplex Collection"],"prefix":"10.1002","volume":"18","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-5091-970X","authenticated-orcid":false,"given":"Margaret L.","family":"McAllister","sequence":"first","affiliation":[{"name":"Department of Allied Health Sciences University of North Carolina at Chapel Hill  Chapel Hill North Carolina USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8942-1562","authenticated-orcid":false,"given":"Tyler","family":"McFayden","sequence":"additional","affiliation":[{"name":"Carolina Institute for Developmental Disabilities University of North Carolina at Chapel Hill  Chapel Hill North Carolina USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3381-3473","authenticated-orcid":false,"given":"Clare","family":"Harrop","sequence":"additional","affiliation":[{"name":"Department of Allied Health Sciences University of North Carolina at Chapel Hill  Chapel Hill North Carolina USA"},{"name":"TEACCH Autism Program University of North Carolina at Chapel Hill  Chapel Hill North Carolina USA"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2025,1,7]]},"reference":[{"key":"e_1_2_10_2_1","doi-asserted-by":"crossref","unstructured":"Aman M. 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