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Author | Title | Year | Publication | Serial | Volume | Pages |
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Clement, T.S.; Weaver, J.E.; Sherburne, L.M.; Zentall, T.R. | Simultaneous discrimination learning in pigeons: value of S- affects the relative value of its associated S+ | 1998 | The Quarterly journal of experimental psychology. B, Comparative and physiological psychology | 252 | 51 | 363-378 |
Clement, T.S.; Feltus, J.R.; Kaiser, D.H.; Zentall, T.R. | “Work ethic” in pigeons: reward value is directly related to the effort or time required to obtain the reward | 2000 | Psychonomic bulletin & review | 248 | 7 | 100-106 |