{"pk":25849,"title":"A Bayesian hierarchical model of local-global processing: visual crowding\nas a case-study","subtitle":null,"abstract":"We explore the interaction between local-global informa-\ntion processing in visual perception, leveraging a visual\nphenomenon known as crowding, whereby the perception\nof a target stimulus is impaired by the presence of nearby\n\nankers. The majority of established models explain\nthe crowding e?ect in terms of local interactions. How-\never, recent experimental results indicate that a classical\ncrowding e?ect, the deterioration in the discrimination\nof a vernier stimulus embedded in a square, is alleviated\nby the presence of additional \nanker squares (\\uncrowd-\ning\"). Here, we propose that crowding and uncrowding\narise from cortical inferences about hierarchically orga-\nnized groups, and formalize this concept using a hierarchi-\ncal Bayesian model. We show that the model reproduces\nboth crowding and uncrowding for \nanked vernier discrim-\nination. More generally, the model provides a normative\nexplanation of how visual information might simultane-\nously \now bottom-up, top-down, and laterally, to allow\nthe visual system to interactively process local and global\nfeatures in the visual scene.","language":"eng","license":{"name":"","short_name":"","text":null,"url":""},"keywords":[],"section":"Papers","is_remote":true,"remote_url":"https://escholarship.org/uc/item/98m8569z","frozenauthors":[{"first_name":"Shunan","middle_name":"","last_name":"Zhang","name_suffix":"","institution":"University of California, San Diego","department":""},{"first_name":"Man","middle_name":"","last_name":"Song","name_suffix":"","institution":"University of California, San Diego","department":""},{"first_name":"Angela","middle_name":"J","last_name":"Yu","name_suffix":"","institution":"University of California, San Diego","department":""}],"date_submitted":null,"date_accepted":null,"date_published":"2015-01-01T18:00:00Z","render_galley":null,"galleys":[{"label":"PDF","type":"pdf","path":"https://journalpub.escholarship.org/cognitivesciencesociety/article/25849/galley/15473/download/"}]}