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Of equal or perhaps greater interest is the question of whether common brain mechanisms mediate the acquisition and development of eating and drug-taking habits. Response-independent tonic increases in extracellular dopamine levels associated with increased tonic firing of the dopamine system cause increases in general locomotor activity, perhaps simply by increasing the salience of novel and conditioned stimuli that elicit Pavlovian investigatory and learned instrumental responses — Phasic activation of the dopamine system is known to be triggered by two excitatory inputs. Salamone JD, Correa M. While there is a good deal of interest in what we can learn about obesity from studies of addiction , it will also be interesting to see what we can learn about addiction from studies of obesity and food intake. Interval scale measurement and tests of a model of neural integration.

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See other articles in PMC that cite the published article. The medial forebrain bundle of the rat. Each pulse within a train typically lasts only 0. Implications for understanding and treatment of addiction. Spread of current from monopolar stimulation of the lateral hypothalamus. When studying single neurons, one simply stimulates the neuron twice, varying the interval between the first and second stimulations in order to find the minimum interval that still allows the cell to respond to the second stimulation. Again, the mesocorticolimbic dopamine system is implicated. in this case the cannabinoids are effective as rewards, at least in the ventral tegmental area, where they interact with inputs to the dopamine system and result in its activation 85 ,

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The ventromedial shell , ventrolateral core and dorsal striatum—major dopamine terminal fields—are differentially responsive to different kinds of rewards and reward predictors 96 — A hypothesis How might the dopamine system, a system implicated in both the habit-forming consequences of food addictive drug consumption, be involved as well in the antecedent motivation to obtain these rewards. Self-administration of small amounts of morphine through glass micropipettes into the ventral tegmental area of the rat. Cortical dopaminergic involvement in cocaine reinforcement. Here, when paired pulses are given, a longer interval between the C-pulses and the T-pulses must be allowed before the T-pulses will be effective. Of equal or perhaps greater interest is the question of whether common brain mechanisms mediate the acquisition and development of eating and drug-taking habits. For example, rats will lever-press or nose-poke to administer microinjections of morphine 68 , 69 , or the endogenous mu opioid endomorphin 70 into the ventral tegmental area. they also learn to self-administer the selective mu and delta opioids DAMGO and DPDPE into this brain region

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Description: First, stimulation-induced feeding and lateral hypothalamic brain stimulation reward are each attenuated by dopamine antagonists 46 — Psychopharmacology Berl The refractory period distributions for reward and stimulation-induced feeding are the same whether the stimulating electrodes are at the ventral tegmental or the lateral hypothalamic level of the medial forebrain bundle Food reward and cocaine increase extracellular dopamine in the nucleus accumbens as measured by microdialysis. Pharmacological evidence further suggests a common substrate for brain stimulation reward and stimulation-induced feeding. this evidence suggests the common involvement of dopamine neurons, neurons that do not have the refractory period and conduction velocity characteristics of the first-stage fibers of the medial forebrain bundle but are presumably second-stage or third stage fibers downstream from the directly activated fibers. That different subsystems might serve different functions is further suggested by the fact that there are two general classes of dopamine receptor D1 and D2 and two striatal output pathways direct and indirect that selectively express them. Support Center Support Center. Self-administration of psychomotor stimulant drugs. Extinction of cocaine self-administration reveals functionally and temporally distinct dopaminergic signals in the nucleus accumbens.
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