Logue A W, Peña-Correal T E
Department of Psychology, State University of New York at Stony Brook, Stony Brook, NY 11794, USA.
Behav Processes. 1985 May;10(4):355-68. doi: 10.1016/0376-6357(85)90036-1.
Two experiments examined the effect of food deprivation on choice in a discrete-trials self-control paradigm, choice between a larger, more-delayed reinforcer and a smaller, less-delayed reinforcer. In Experiment 1, four pigeons were each deprived to 65%, 80%, and 90% of their free-feeding weights, and the delay to the smaller reinforcer was varied. Deprivation level did not affect choice, but the rate of ineffective key pecks made during the reinforcer delays increased as deprivation increased. In Experiment 2, four pigeons were exposed to conditions in which they were fed up to their 80% free-feeding weights following experimental sessions, and in which they were given no postsession feedings. Both the pigeons' weights and their latencies to insert their heads into the food hopper when food was available were lower when the pigeons were not fed following experimental sessions. Choice showed no change. Deprivation level affects response rate and eating behavior in these procedures, but not choice.
两项实验在离散试验自我控制范式中考察了食物剥夺对选择的影响，即在一个更大、延迟时间更长的强化物与一个更小、延迟时间更短的强化物之间进行选择。在实验1中，四只鸽子分别被剥夺至其自由进食体重的65%、80%和90%，并改变较小强化物的延迟时间。剥夺水平并未影响选择，但在强化物延迟期间无效啄键的速率随着剥夺程度的增加而增加。在实验2中，四只鸽子被置于以下条件下：实验 sessions 后，它们被喂食至其自由进食体重的80%；以及它们在实验 sessions 后不被喂食。当鸽子在实验 sessions 后不被喂食时，它们的体重以及在有食物时将头伸进食槽的潜伏期都更低。选择没有变化。在这些程序中，剥夺水平影响反应速率和进食行为，但不影响选择。
