{"pk":26979,"title":"Inferring Human Interaction from Motion Trajectories in Aerial Videos","subtitle":null,"abstract":"People are adept at perceiving interactions from movementsof simple shapes but the underlying mechanism remains un-known. Previous studies have often used object movementsdefined by experimenters. The present study used aerial videosrecorded by drones in a real-life environment to generate de-contextualized motion stimuli. Motion trajectories of dis-played elements were the only visual input. We measuredhuman judgments of interactiveness between two moving el-ements, and the dynamic change of such judgments over time.A hierarchical model was developed to account for human per-formance in this task, which represents interactivity using la-tent variables, and learns the distribution of critical movementfeatures that signal potential interactivity. The model providesa good fit to human judgments and can also be generalized tothe original Heider-Simmel animations (1944). The model canalso synthesize decontextualized animations with controlleddegree of interactiveness, providing a viable tool for studyinganimacy and social perception.","language":"eng","license":{"name":"","short_name":"","text":null,"url":""},"keywords":[{"word":"social interaction; motion; decontextualized ani-mation; hierarchical model; action understanding"}],"section":"Talks: Papers","is_remote":true,"remote_url":"https://escholarship.org/uc/item/42f98263","frozenauthors":[{"first_name":"Tianmin","middle_name":"","last_name":"Shu","name_suffix":"","institution":"University of California, Los Angeles","department":""},{"first_name":"Yujia","middle_name":"","last_name":"Peng","name_suffix":"","institution":"University of California, Los Angeles","department":""},{"first_name":"Lifeng","middle_name":"","last_name":"Fan","name_suffix":"","institution":"University of California, Los Angeles","department":""},{"first_name":"Hongjing","middle_name":"","last_name":"Lu","name_suffix":"","institution":"University of California, Los Angeles","department":""},{"first_name":"Song-Chun","middle_name":"","last_name":"Zhu","name_suffix":"","institution":"University of California, Los Angeles","department":""}],"date_submitted":null,"date_accepted":null,"date_published":"2017-01-01T18:00:00Z","render_galley":null,"galleys":[{"label":"PDF","type":"pdf","path":"https://journalpub.escholarship.org/cognitivesciencesociety/article/26979/galley/16615/download/"}]}