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Author | Title | Year | Publication | Serial | Volume | Pages |
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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 |
Clement, T.S.; Zentall, T.R. | Second-order contrast based on the expectation of effort and reinforcement | 2002 | Journal of experimental psychology. Animal behavior processes | 241 | 28 | 64-74 |