{"pk":5373,"title":"Context effects in temporal differentiation: Some data and a model","subtitle":null,"abstract":"We examined whether temporal context influences how animals produce a time interval. Six pigeons pecked one key to start an interval and then another key to end the interval. Reinforcement followed whenever the interval duration fell within a range of values signaled by the keylight colors. During Phase 1, keylight colors S1 and L1, intermixed across trials, signaled the ranges (0.5-1.5 s) and (1.5- 4.5 s), respectively. During Phase 2, colors S2 and L2 signaled the ranges (1.5-4.5 s) and (4.5-13.5 s), respectively. We asked whether the intervals produced in the presence of L1 and S2, stimuli signalling the same range, varied with their temporal context, short in Phase 1, long in Phase 2. The results showed that a) the intervals produced in the presence of the different keylight colors accorded with the main properties of temporal differentiation, including Weber’s law, b) the L1 intervals had slightly higher means than the S2 intervals, a weak contrast effect, c) the L1 intervals also had higher variability than the S2 intervals. An extension of the learning-to-time model to temporal differentiation tasks reproduced some of the major features of the data but left unanswered how context might change the model parameters.","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":"temporal differentiation"},{"word":"context effect"},{"word":"Learning-to-Time model"},{"word":"Weber’s law"},{"word":"Pigeons"}],"section":"Special Issue on Timing and Time Perception","is_remote":true,"remote_url":"https://escholarship.org/uc/item/588544v0","frozenauthors":[{"first_name":"Marilia","middle_name":"Pinheiro de","last_name":"Carvalho","name_suffix":"","institution":"University of Minho","department":"None"},{"first_name":"Armando","middle_name":"","last_name":"Machado","name_suffix":"","institution":"University of Minho, Portugal","department":"None"},{"first_name":"Marco","middle_name":"","last_name":"Vasconcelos","name_suffix":"","institution":"University of Minho, Portugal\nUniversity of Oxford, UK","department":"None"}],"date_submitted":"2015-09-09T19:51:56Z","date_accepted":"2015-09-09T19:51:56Z","date_published":"2015-12-17T03:13:46Z","render_galley":null,"galleys":[{"label":"","type":"","path":"https://journalpub.escholarship.org/uclapsych_ijcp/article/5373/galley/3229/download/"}]}