“…Motivation is strongly influenced by situational cues in the case of well-learned habitual behavior. For example, sated animals that were trained to respond for food under conditions of hunger will continue to respond normally for food and to eat it, for a considerable period, when subsequently tested when sated (Kimble, 1951;Koch and Daniel, 1945). Indeed, animals trained to work for food will continue to work for it despite the availability of free food (Jensen, 1963;Morgan, 1974).…”
Electrical stimulation of the medial forebrain bundle can reward arbitrary acts or motivate biologically primitive, species-typical behaviors like feeding or copulation. The subsystems involved in these behaviors are only partially characterized, but they appear to transsynaptically activate the mesocorticolimbic dopamine system. Basal function of the dopamine system is essential for arousal and motor function; phasic activation of this system is rewarding and can potentiate the effectiveness of reward-predictors that guide learned behaviors. This system is phasically activated by most drugs of abuse and such activation contributes to the habit-forming actions of these drugs.
“…Motivation is strongly influenced by situational cues in the case of well-learned habitual behavior. For example, sated animals that were trained to respond for food under conditions of hunger will continue to respond normally for food and to eat it, for a considerable period, when subsequently tested when sated (Kimble, 1951;Koch and Daniel, 1945). Indeed, animals trained to work for food will continue to work for it despite the availability of free food (Jensen, 1963;Morgan, 1974).…”
Electrical stimulation of the medial forebrain bundle can reward arbitrary acts or motivate biologically primitive, species-typical behaviors like feeding or copulation. The subsystems involved in these behaviors are only partially characterized, but they appear to transsynaptically activate the mesocorticolimbic dopamine system. Basal function of the dopamine system is essential for arousal and motor function; phasic activation of this system is rewarding and can potentiate the effectiveness of reward-predictors that guide learned behaviors. This system is phasically activated by most drugs of abuse and such activation contributes to the habit-forming actions of these drugs.
“…A descriptive summary of the relevant experimentation cannot be given here. The literature is large (2,4,7,9,II,15,17,19,21,23,24,25,26,29) and much of it current.…”
“…Consequently, this discussion is restricted to studies using free-operant training procedures with rats. Apart from Perin (1942) and Crocetti (1962), experiments using free-operant schedules to examine the effect of a posttraining shift in primary motivation were conducted by Skinner (1936); Sackett (1939); Finan (1940); Heathers and Arakelian (1941); Koch and Daniel (1945); Saltzman and Koch (1948); Strassburger (1950); Horenstein (1951); Yamaguchi (1951); Grice and Davis (1957); and Eisman, Theios, and Linton (1961). In all of these studies, however, careful examination of the procedures used revealed that either the animals explicitly received prior experience with the reinforcer in the test deprivation state or this aspect of the procedure was unclear from the presentation.…”
In 5 experiments the role of incentive learning in instrumental performance following a shift in primary motivation was examined. In Experiments 1 and 2 rats trained to perform an instrumental action reinforced by either pellets or maltodextrin when in a low-deprivation state were shifted to a high-deprivation state and tested in extinction. This shift in deprivation increased performance only if the animals had been exposed to the reinforcer in the high-deprivation state prior to instrumental training. Experiments 3, 4, and 5 examined the reverse shift training in a high-deprivation state and testing in a low-deprivation state, and found, similarly, that performance was only sensitive to this shift if animals were previously exposed to the reinforcer while in the low-deprivation state. These experiments support the conclusion that instrumental performance following revaluation of the reinforcer depends on a process of incentive learning.
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