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Previous work has shown that sensorimotor decisions can improve under threat. However, it is unclear if these improvements are achieved by improvements in perceptual or motor performance. Here, we present two hypotheses for how threat might influence motor preparation and use muscular stretch reflexes to test both. The task\u2010unspecific hypothesis predicts that threat promotes motor preparation irrespective of the reach target, through tonic upregulation of the short latency stretch reflex. In contrast, the task\u2010specific hypothesis predicts that threat increases sensory processing for a specific reach target, leading to direction\u2010selective up\u2010 and down\u2010regulation of the long latency stretch reflex. Participants were asked to reach to one of two targets that appeared shortly before a perturbation eliciting a stretch reflex; they performed this task either under threat of an electric shock or under safe circumstances. Skin conductance and heart rate results show that the threat manipulation significantly increased sympathetic activation, but not parasympathetic activation. Supporting the task\u2010specific hypothesis, the EMG findings demonstrate a direction\u2010selective modulation of the long\u2010latency response of stretch reflexes, starting ~100\u2009ms after perturbation onset. Our results suggest that stress affects action preparation through upregulation of cortical visuomotor circuits.<\/jats:p>","DOI":"10.1111\/ejn.70693","type":"journal-article","created":{"date-parts":[[2026,10,2]],"date-time":"2026-10-02T05:39:51Z","timestamp":1790919591000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Stretch\u2010Induced Muscle Responses Under Threat Versus Safety"],"prefix":"10.1111","volume":"64","author":[{"ORCID":"https:\/\/orcid.org\/0009-0002-6425-0466","authenticated-orcid":false,"given":"Yvonne F.","family":"Visser","sequence":"first","affiliation":[{"name":"Donders Center for Cognition Radboud University Nijmegen  Nijmegen the Netherlands"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Bob","family":"Bramson","sequence":"additional","affiliation":[{"name":"Donders Center for Cognitive Neuroimaging Radboud University Nijmegen  Nijmegen the Netherlands"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9615-4220","authenticated-orcid":false,"given":"W. 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