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  Author (up) Title Year Publication Serial Volume Pages Links
Boysen, S.T.; Bernston, G.G.; Hannan, M.B.; Cacioppo, J.T. Quantity-based interference and symbolic representations in chimpanzees (Pan troglodytes) 1996 Journal of Experimental Psychology. Animal Behavior Processes 2781 22 76-86 details   openurl
Boysen, S.T.; Berntson, G.G. Responses to quantity: perceptual versus cognitive mechanisms in chimpanzees (Pan troglodytes) 1995 Journal of Experimental Psychology. Animal Behavior Processes 2783 21 82-86 details   openurl
Burke, D.; Cieplucha, C.; Cass, J.; Russell, F.; Fry, G. Win-shift and win-stay learning in the short-beaked echidna (Tachyglossus aculeatus) 2002 Animal Cognition 2605 5 79-84 details   doi
Byrne, T.; Sutphin, G.; Poling, A. Acquisition, extinction, and reacquisition of responding with delayed and immediate reinforcement 1998 Behavioural Processes 3601 43 97-101 details   url
Cerutti, D.T.; Staddon, J.E.R. Immediacy versus anticipated delay in the time-left experiment: a test of the cognitive hypothesis 2004 Journal of Experimental Psychology. Animal Behavior Processes 2768 30 45-57 details   doi
Christensen, J.W. Object habituation in horses: Voluntary vs. negatively reinforced approach to frightening stimuli 2012 Proceedings of the 2. International Equine Science Meeting 5499 in press details   pdf openurl
Christensen, J.W.; Ahrendt, L.P.; Lintrup, R.; Gaillard, C.; Palme, R.; Malmkvist, J. Does learning performance in horses relate to fearfulness, baseline stress hormone, and social rank? 2012 Applied Animal Behaviour Science 5769 140 44-52 details   doi
Christensen, J.W.; Rundgren, M.; Olsson, K. Training methods for horses: habituation to a frightening stimulus 2006 Equine veterinary journal 1783 38 439-443 details   openurl
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 details   openurl
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 details   openurl
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