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Existing evidence indicates that anxiety and atypical sensory features are associated with restricted and repetitive behaviours, but cannot clarify the order of emergence of these traits. This study uses data from a prospective longitudinal study of infants with and without a family history of autism ( N\u2009=\u2009247; Elevated Likelihood N\u2009=\u2009170 and Typical Likelihood N\u2009=\u200977). Longitudinal cross-lag models tested bidirectional pathways between parent-rated infant fear\/shyness and perceptual sensitivity at 8, 14 and 24\u2009months, and associations between these domains and parent-rated restricted and repetitive behaviours and social communication scores at 36\u2009months. In addition to within-domain continuity, higher levels of fear\/shyness at 14\u2009months were associated with higher levels of perceptual sensitivity at 24\u2009months. Higher levels of both fear\/shyness and perceptual sensitivity at 24\u2009months were associated with greater restricted and repetitive behaviours and social communication scores at 36\u2009months. Results demonstrate the directionality of developmental pathways between fear\/shyness and perceptual sensitivity in infancy and toddlerhood, but question theories that argue that these domains specifically underlie restricted and repetitive behaviours rather than autism. Identifying how early emerging anxiety and sensory behaviours relate to later autism is important for understanding pathways and developing targeted support for autistic children.<\/jats:p>\n                  <jats:sec>\n                    <jats:title>Lay abstract<\/jats:title>\n                    <jats:p>Restricted interests and repetitive behaviours are central to the diagnosis of autism and can have profound effects on daily activities and quality of life. These challenges are also linked to other co-occurring conditions such as anxiety and sensory sensitivities. Here, we looked at whether early emerging signs of anxiety and sensory problems appear before symptoms of autism by studying infants with a family history of autism, as these infants are more likely to develop autism themselves. Studying infant siblings provides an opportunity for researchers to focus on early developmental markers of autism as these infants can be followed from birth. This study found that early infant signs of anxiety (e.g. fear\/shyness) predicted later perceptual sensitivity, and those infants who scored higher on fear\/shyness and sensitivity were more likely to experience more persistent repetitive behaviours, but also social and communication difficulties in toddlerhood. Early signs of anxiety and perceptual sensitivity may thus relate to both later social difficulties and repetitive behaviours. These findings support the importance of further research exploring the causal links between these domains in relation to autism, resulting in increased understanding of children who go onto develop autism in the future and guiding early interventions and supports.<\/jats:p>\n                  <\/jats:sec>","DOI":"10.1177\/13623613211068932","type":"journal-article","created":{"date-parts":[[2022,1,13]],"date-time":"2022-01-13T03:47:39Z","timestamp":1642045659000},"page":"1947-1958","update-policy":"https:\/\/doi.org\/10.1177\/sage-journals-update-policy","source":"Crossref","is-referenced-by-count":16,"title":["A prospective study of associations between early fearfulness and perceptual sensitivity and later restricted and repetitive behaviours in infants with typical and elevated likelihood of autism"],"prefix":"10.1177","volume":"26","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-2196-4496","authenticated-orcid":false,"given":"Nisha","family":"Narvekar","sequence":"first","affiliation":[{"name":"King\u2019s College London, UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7455-5514","authenticated-orcid":false,"given":"Virginia","family":"Carter Leno","sequence":"additional","affiliation":[{"name":"King\u2019s College London, UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0290-6124","authenticated-orcid":false,"given":"Greg","family":"Pasco","sequence":"additional","affiliation":[{"name":"King\u2019s College London, UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Mark H","family":"Johnson","sequence":"additional","affiliation":[{"name":"Birkbeck, University of London, UK"},{"name":"University of Cambridge, UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5747-9540","authenticated-orcid":false,"given":"Emily JH","family":"Jones","sequence":"additional","affiliation":[{"name":"Birkbeck, University of London, UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1993-6549","authenticated-orcid":false,"given":"Tony","family":"Charman","sequence":"additional","affiliation":[{"name":"King\u2019s College London, UK"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"179","published-online":{"date-parts":[[2022,1,13]]},"reference":[{"key":"bibr1-13623613211068932","doi-asserted-by":"publisher","DOI":"10.1176\/appi.books.9780890425596"},{"key":"bibr2-13623613211068932","doi-asserted-by":"publisher","DOI":"10.1016\/j.dcn.2017.08.006"},{"key":"bibr3-13623613211068932","doi-asserted-by":"publisher","DOI":"10.1016\/j.jaac.2019.08.478"},{"key":"bibr4-13623613211068932","doi-asserted-by":"publisher","DOI":"10.1007\/s10802-020-00673-0"},{"key":"bibr5-13623613211068932","doi-asserted-by":"publisher","DOI":"10.1192\/bjp.175.5.444"},{"key":"bibr6-13623613211068932","doi-asserted-by":"publisher","DOI":"10.1007\/s10803-012-1546-4"},{"key":"bibr7-13623613211068932","doi-asserted-by":"publisher","DOI":"10.1007\/s10803-017-3161-x"},{"issue":"2","key":"bibr8-13623613211068932","doi-asserted-by":"crossref","first-page":"78","DOI":"10.1002\/aur.124","volume":"3","author":"Boyd B. 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