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In a matching-to-sample task, pigeons learned to choose key S after a T\u2013s houselight sample and key NS in the absence of the houselight sample. For one group of pigeons, T = 20\u2005s; for another, T = 10\u2005s. Subsequently, houselight duration was varied to obtain temporal generalization gradients. Results showed that (a) proportion S increased as houselight duration ranged from 0\u2005s to T\u2005s and then remained high for houselight durations longer than T; (b) the gradients were well described by negative-exponential functions; (c) these non-flat gradients were present from the beginning of testing, and; (d) the average gradients obtained with T = 20\u2005s and T = 10\u2005s overlapped when plotted in relative time. We conclude that temporal control does not require explicit discrimination training along the temporal dimension, and that temporal generalization gradients obtained with an interdimensional protocol show the scalar property of timing. We discuss how these findings challenge current models of timing.<\/jats:p>","DOI":"10.1080\/17470218.2015.1091851","type":"journal-article","created":{"date-parts":[[2015,11,25]],"date-time":"2015-11-25T15:16:10Z","timestamp":1448464570000},"page":"1701-1718","update-policy":"https:\/\/doi.org\/10.1177\/sage-journals-update-policy","source":"Crossref","is-referenced-by-count":1,"title":["Temporal generalization gradients following an interdimensional discrimination protocol"],"prefix":"10.1177","volume":"69","author":[{"given":"Ana Catarina","family":"Vieira de Castro","sequence":"first","affiliation":[{"name":"Instituto de Investiga\u00e7\u00e3o e Inova\u00e7\u00e3o em Sa\u00fade, Universidade do Porto, Porto, Portugal"},{"name":"IBMC\u2013 Instituto de Biologia Molecular e Celular, Universidade do Porto, Porto, Portugal"},{"name":"School of Psychology, University of Minho, Braga, Portugal"}]},{"given":"Marco","family":"Vasconcelos","sequence":"additional","affiliation":[{"name":"School of Psychology, University of Minho, Braga, Portugal"},{"name":"Department of Zoology, University of Oxford, Oxford, UK"}]},{"given":"Armando","family":"Machado","sequence":"additional","affiliation":[{"name":"School of Psychology, University of Minho, Braga, Portugal"}]}],"member":"179","published-online":{"date-parts":[[2016,9,1]]},"reference":[{"key":"bibr1-17470218.2015.1091851","unstructured":"ABET (II) [Computer software]. 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