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Infants and toddlers later diagnosed with autism spectrum disorder (ASD) often display hyporeactivity to sensory stimuli, which has also been associated with lower child communication abilities and lower parent responsiveness. Yet, whether parent responsiveness mediates the relationship between child hyporeactivity and later communication outcomes remains unexplored. This study is a secondary data analysis which includes children (\n                      <jats:italic>n<\/jats:italic>\n                      \u00a0=\u200983; 56 males) identified as at elevated likelihood of later ASD. Children completed an observational measure of sensory reactivity and a standard developmental assessment at 14 (Time 1) and 23\u2009months old (Time 2). At each time point, parents reported on the child's adaptive communication behaviors and sensory behaviors, and Parent Verbal Responsiveness (AvgPVR) was coded from parent\u2013child free\u2010play videos. Results indicated that the association between child sensory hyporeactivity at Time 1 (observed and parent\u2010reported) and communication at Time 2 (observed and parent reported) was significantly mediated by AvgPVR. Although child hyporeactivity predicts poorer communication outcomes, increased parent verbal responsiveness may attenuate this negative impact. Parent responsiveness, a focus of many parent\u2010mediated interventions, may be an important mechanism of treatment response that should be directly tested in future research.\n                    <\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Lay Summary<\/jats:title>\n                    <jats:p>Toddlers at elevated likelihood of autism spectrum disorder (ASD) are often under\u2010reactive (hyporeactive) to sensory stimuli. This hyporeactivity slows learning of communication skills and provides parents with fewer opportunities to respond to their children. In this study, children with hyporeactivity at 14\u2009months generally had poorer communication at 23\u2009months; however, the more responsive their parents were, the weaker the relationship between early hyporeactivity and later communication. Thus, increasing parent responsiveness may lead to better communication outcomes for toddlers with the early ASD symptom of hyporeactivity.<\/jats:p>\n                  <\/jats:sec>","DOI":"10.1002\/aur.2557","type":"journal-article","created":{"date-parts":[[2021,6,15]],"date-time":"2021-06-15T03:14:36Z","timestamp":1623726876000},"page":"2027-2037","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":19,"title":["Parent responsiveness mediates the association between hyporeactivity at age 1\u2009year and communication at age 2\u2009years in children at elevated likelihood of\n                    <scp>ASD<\/scp>"],"prefix":"10.1002","volume":"14","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-7764-6166","authenticated-orcid":false,"given":"Rebecca","family":"Grzadzinski","sequence":"first","affiliation":[{"name":"Program for Early Autism Research, Leadership, and Service (PEARLS), University of North Carolina  Chapel Hill North Carolina USA"},{"name":"University of North Carolina, Carolina Institute for Developmental Disabilities  Chapel Hill North Carolina USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Sallie W.","family":"Nowell","sequence":"additional","affiliation":[{"name":"University of North Carolina, Frank Porter Graham Child Development Institute  Chapel Hill North Carolina USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Elizabeth R.","family":"Crais","sequence":"additional","affiliation":[{"name":"Program for Early Autism Research, Leadership, and Service (PEARLS), University of North Carolina  Chapel Hill North Carolina USA"},{"name":"Division of Speech and Hearing Sciences University of North Carolina"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5321-6353","authenticated-orcid":false,"given":"Grace T.","family":"Baranek","sequence":"additional","affiliation":[{"name":"Program for Early Autism Research, Leadership, and Service (PEARLS), University of North Carolina  Chapel Hill North Carolina USA"},{"name":"The Mrs. T. 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Chan Division of Occupational Science and Occupational Therapy University of Southern California  Los Angeles California USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Lauren","family":"Turner\u2010Brown","sequence":"additional","affiliation":[{"name":"Program for Early Autism Research, Leadership, and Service (PEARLS), University of North Carolina  Chapel Hill North Carolina USA"},{"name":"University of North Carolina, TEACCH Autism Program  Chapel Hill North Carolina USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7722-406X","authenticated-orcid":false,"given":"Linda R.","family":"Watson","sequence":"additional","affiliation":[{"name":"Program for Early Autism Research, Leadership, and Service (PEARLS), University of North Carolina  Chapel Hill North Carolina USA"},{"name":"Division of Speech and Hearing Sciences University of North Carolina"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2021,6,15]]},"reference":[{"key":"e_1_2_11_2_1","doi-asserted-by":"publisher","DOI":"10.1111\/jcpp.12219"},{"key":"e_1_2_11_3_1","doi-asserted-by":"publisher","DOI":"10.1002\/aur.1626"},{"key":"e_1_2_11_4_1","volume-title":"Sensory processing assessment for young children (SPA)","author":"Baranek G. 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