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Real-world causal collisions are subject to Newtonian constraints on the relative speed of B following the collision, but here we show that perceptual constraints on the relative speed of B (which align imprecisely with Newtonian principles) define two categories of causal events in perception. Using performance-based tasks, we show that triggering events, in which B moves noticeably faster than A, are treated as being categorically different from launching events, in which B does not move noticeably faster than A, and that these categories are unique to causal events (Experiments 1 and 2). Furthermore, we show that 7- to 9-month-old infants are sensitive to this distinction, which suggests that this boundary may be an early-developing component of causal perception (Experiment 3).<\/jats:p>","DOI":"10.1177\/0956797617719930","type":"journal-article","created":{"date-parts":[[2017,9,28]],"date-time":"2017-09-28T13:19:35Z","timestamp":1506604775000},"page":"1649-1662","update-policy":"https:\/\/doi.org\/10.1177\/sage-journals-update-policy","source":"Crossref","is-referenced-by-count":58,"title":["Categories and Constraints in Causal Perception"],"prefix":"10.1177","volume":"28","author":[{"given":"Jonathan F.","family":"Kominsky","sequence":"first","affiliation":[{"name":"Department of Psychology, Harvard University"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Brent","family":"Strickland","sequence":"additional","affiliation":[{"name":"Centre National de le Recherche Scientifique, Ecole Normale Superieure\/PSL\/Institut Jean Nicod"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Annie E.","family":"Wertz","sequence":"additional","affiliation":[{"name":"Max Planck Research Group Naturalistic Social Cognition, Max Planck Institute for Human Development, Berlin, Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Claudia","family":"Elsner","sequence":"additional","affiliation":[{"name":"Max Planck Research Group Naturalistic Social Cognition, Max Planck Institute for Human Development, Berlin, Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Karen","family":"Wynn","sequence":"additional","affiliation":[{"name":"Department of Psychology, Yale University"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Frank C.","family":"Keil","sequence":"additional","affiliation":[{"name":"Department of Psychology, Yale University"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"179","published-online":{"date-parts":[[2017,9,28]]},"reference":[{"key":"bibr1-0956797617719930","doi-asserted-by":"publisher","DOI":"10.1080\/17470216008416721"},{"key":"bibr2-0956797617719930","doi-asserted-by":"publisher","DOI":"10.1163\/156856897X00357"},{"key":"bibr3-0956797617719930","doi-asserted-by":"publisher","DOI":"10.3758\/BF03192712"},{"key":"bibr4-0956797617719930","doi-asserted-by":"publisher","DOI":"10.1007\/BF00403873"},{"key":"bibr5-0956797617719930","doi-asserted-by":"publisher","DOI":"10.3758\/BF03210711"},{"key":"bibr6-0956797617719930","doi-asserted-by":"publisher","DOI":"10.1093\/acprof:oso\/9780195367638.001.0001"},{"key":"bibr7-0956797617719930","unstructured":"Casstevens R. 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