{"pk":5662,"title":"Renewal of Formerly Conditioned Fear in Rats after Extensive Extinction Training","subtitle":null,"abstract":"We explored renewal of formerly acquired and then extinguished fear in rats. After 24 paired trials of a tone and an electric shock, acquired fear to the tone was extinguished in another context by repeated exposure to the tone alone. Conditioned fear was behaviorally extinguished by the 32nd trial of tone exposure; 40 or 80 additional extinction trials (i.e., a total of 72 or 112 extinction trials) were administered to independent groups of rats. Extinguished fear was renewed by testing the tone in the original context, independently of the amount of the preceding extinction training. The finding suggests that this type of fear renewal is difficult to prevent even after extensive extinction training prior to context change. Fear renewal also took place by shifting contexts after 72 extinction trials, when the fear had been extinguished in the context of acquisition. This kind of renewal was, however, prevented by extending extinction training to 112 trials.","language":"en","license":{"name":"Creative Commons Attribution 4.0","short_name":"CC BY 4.0","text":"Attribution — You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.\r\n\r\nNo additional restrictions — You may not apply legal terms or technological measures that legally restrict others from doing anything the license permits.","url":"https://creativecommons.org/licenses/by/4.0"},"keywords":[{"word":"International Journal of Comparative Psychology"},{"word":"Behavior"},{"word":"Behaviour"},{"word":"learning"},{"word":"Behavioral Taxonomy"},{"word":"cognition"},{"word":"Choice"},{"word":"Conditioning"},{"word":"Conditioned Fear, Extinction"},{"word":"rats"}],"section":"Research Article","is_remote":true,"remote_url":"https://escholarship.org/uc/item/7d41p8fj","frozenauthors":[{"first_name":"Noriko","middle_name":"","last_name":"Tamai","name_suffix":"","institution":"Kwansei Gakuin University, Japan","department":"None"},{"first_name":"Sadahiko","middle_name":"","last_name":"Nakajima","name_suffix":"","institution":"Kwansei Gakuin University, Japan","department":"None"}],"date_submitted":"2009-05-05T07:00:00Z","date_accepted":"2009-05-05T07:00:00Z","date_published":"2000-12-31T08:00:00Z","render_galley":null,"galleys":[{"label":"","type":"","path":"https://journalpub.escholarship.org/uclapsych_ijcp/article/5662/galley/3417/download/"}]}