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The acoustic startle response and prepulse inhibition (PPI) are common metrics used to assess disruptions in sensory processing and sensorimotor gating in clinical studies and animal models. However, often there are inconsistent findings on ASD-related PPI deficits across different studies. Here, we used a novel method for assessing changes in startle and PPI in rodents, using the<jats:italic>Cntnap2<\/jats:italic>knock-out (KO) rat model for neurodevelopmental disorder\/ASD that has consistently shown PPI disruptions in past studies. We discovered that not only sex and prepulse intensity but also the intensity of the startle stimulus profoundly impacts whether PPI deficits are evident in the<jats:italic>Cntnap2<\/jats:italic>KO rat or not. We show that rats do not universally exhibit a PPI deficit; instead, impaired PPI is contingent on specific testing conditions. Notably, at lower startle stimulus intensities,<jats:italic>Cntnap2<\/jats:italic>KO rats not only demonstrated intact PPI but also exhibited evidence of enhanced PPI compared with their wild-type counterparts. This finding emphasizes the importance of considering specific testing conditions when evaluating startle and PPI in the context of ASD and other neuropsychiatric conditions and might explain some of the inconsistencies between different studies.<\/jats:p>","DOI":"10.1523\/eneuro.0179-24.2024","type":"journal-article","created":{"date-parts":[[2024,8,19]],"date-time":"2024-08-19T17:45:21Z","timestamp":1724089521000},"page":"ENEURO.0179-24.2024","source":"Crossref","is-referenced-by-count":5,"title":["Not a Deficit, Just Different: Prepulse Inhibition Disruptions in Autism Depend on Startle Stimulus Intensities"],"prefix":"10.1523","volume":"11","author":[{"given":"Ella Elizabeth","family":"Doornaert","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Alaa El-Cheikh","family":"Mohamad","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Gurwinder","family":"Johal","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Brian Leonard","family":"Allman","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Dorit","family":"M\u00f6hrle","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5366-8061","authenticated-orcid":false,"given":"Susanne","family":"Schmid","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"393","published-online":{"date-parts":[[2024,8,19]]},"reference":[{"key":"2024090410450852000_11.9.ENEURO.0179-24.2024.1","doi-asserted-by":"crossref","unstructured":"American Psychiatric Association (2013) Diagnostic and statistical manual of mental disorders , Ed. 5. 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