Effects of naloxone on the self-stimulation behavior of the postero-lateral area of the hypothalamus in rats — Influence of procedural conditions

1981 ◽  
Vol 73 (4) ◽  
pp. 391-393 ◽  
Author(s):  
P. De Witte
Keyword(s):  
The Self ◽  
Self Stimulation ◽  
Lateral Area

scholarly journals Dopamine neurons projecting to medial shell of the nucleus accumbens drive heroin reinforcement

2018 ◽  
Author(s):  
Julie Corre ◽  
Ruud van Zessen ◽  
Michaël Loureiro ◽  
Tommaso Patriarchi ◽  
Lin Tian ◽  
...  
Keyword(s):  
Nucleus Accumbens ◽  
Causal Link ◽  
The Self ◽  
Dopamine Neurons ◽  
Self Administration ◽  
Gaba Neurons ◽  
Calcium Indicators ◽  
Compulsive Consumption ◽  
Self Stimulation ◽  
Stimulation Of

AbstractThe dopamine (DA) hypothesis posits the increase of mesolimbic dopamine levels as a defining commonality of addictive drugs, initially causing reinforcement, eventually leading to compulsive consumption. While much experimental evidence from psychostimulants supports this hypothesis, it has been challenged for opioid reinforcement. Here, we use genetically encoded DA and calcium indicators as well as cFos to reveal that heroin activates DA neurons located in the medial part of the VTA, preferentially projecting to the medial shell of the nucleus accumbens (NAc). Chemogenetic and optogenetic manipulations of VTA DA or GABA neurons establish a causal link to heroin reinforcement. Inhibition of DA neurons blocked heroin self-administration, while heroin inhibited optogenetic self-stimulation of DA neurons. Likewise, heroin occluded the self-inhibition of VTA GABA neurons. Together, these experiments support a model of disinhibition of a subset of VTA DA neurons in opioid reinforcement.

Effect of Trimethadione on the Self-Stimulation Phenomenon

1971 ◽  
Vol 49 (9) ◽  
pp. 850-853
Author(s):  
J. St-Laurent
Keyword(s):  
Motor Activity ◽  
Medial Forebrain Bundle ◽  
Epileptiform Activity ◽  
Anticonvulsant Drug ◽  
The Self ◽  
High Drive ◽  
Self Stimulation

The effects of the anticonvulsant drug trimethadione on the self-stimulation (S.S.) phenomenon are studied on rats. S.S. is elicited via electrodes implanted in the posterior medial forebrain bundle (M.F.B.). Following administration of trimethadione (325 mg/kg i.p.) a tendency toward improvement of S.S. is found; this trend is not statistically significant. The fact that no change of S.S. is observed in the areas of the posterior M.F.B. where seizures rarely occur is discussed in the light that the high rates of S.S. obtained from these areas might be related to the absence of disruptive epileptiform activity. It is concluded that the high rates of S.S. usually obtained from the posterior areas of the M.F.B. may be due to properties such as the involvement of these areas in high-drive behavior and facilitation of motor activity.

scholarly journals Asymmetry of reinforcing properties of the lateral hypothalamus in the self-stimulation test

2018 ◽  
Vol 16 (2) ◽  
pp. 37-41
Author(s):  
Nikolay S Efimov ◽  
Yulia N Bessolova ◽  
Inessa V Karpova ◽  
Andrei A Lebedev ◽  
Petr D Shabanov
Keyword(s):  
Electrical Stimulation ◽  
Lateral Hypothalamus ◽  
The Self ◽  
Stimulation Test ◽  
Reinforcing Agent ◽  
Male Wistar Rats ◽  
Left And Right ◽  
The Right ◽  
Self Stimulation ◽  
Stimulation Of

In the protocols of modern pharmacological studies of a self-stimulation reaction in rodents, stimulating electrodes are implanted as a rule unilaterally. The reinforcing properties of the left and right hypothalamus were suggested to be identical. The aim of the study was to clear up if the possibilities of the left and right hypothalamus to produce self-stimulation are similar or not. Methods. The study was carried out on adult male Wistar rats. The electrodes were implanted into the lateral hypothalamus bilaterally. The rats, in which an approach reaction was observed, learned self-stimulation in the Skinner box with stimulation of the left or right hypothalamus as a reinforcing agent descending thresholds of stimulation up to minimal one. Results. Self-stimulation of the left hypothalamus gave an approach reaction in the majority of rats (81.8%), self-stimulation reaction was developed in 72.7% of rats. Only 46.2% rats reacted on stimulation of the right hypothalamus, self-stimulation reaction was developed in 30.8% of rats. The thresholds of positive and negative reactions registered after electrical stimulation of both sides of hypothalamus were significantly differed (H(3, N = 31) = 14,92; p = 0,002). And these changes were not connected with lateralization but with sign of reaction: in general the thresholds of approach reaction were higher than thresholds of avoidance. Conclusion. In the paper, the fact of different possibility of approach reaction and self-stimulation development as a result of electrical stimulation of the left and right hypothalamus in rats has been described. After stimulation of the left hypothalamus, a possibility to receive positive reaction and to form self-stimulation on its basis is higher than after stimulation of the right hypothalamus. (For citation: Efimov NS, Bessolova YN, Karpova IV, et al. Asymmetry of reinforcing properties of the lateral hypothalamus in the self-stimulation test. Reviews on Clinical Pharmacology and Drug Therapy. 2018;16(2):37-41. doi: 10.17816/RCF16237-41).

Peripheral control of acoustic signals in the auditory system of echolocating bats

1975 ◽  
Vol 62 (2) ◽  
pp. 277-311 ◽  
Author(s):  
N. Suga ◽  
P. H. Jen
Keyword(s):  
Auditory System ◽  
Middle Ear ◽  
Lateral Line ◽  
Acoustic Signals ◽  
Myotis Lucifugus ◽  
The Self ◽  
Cochlear Microphonic ◽  
Fusion Frequency ◽  
Incoming Signal ◽  
Self Stimulation

Many species of echolocating bats emit intense orientation sounds. If such intense sounds directly stimulated their ears, detection of faint echoes would be impaired. Therefore, possible mechanisms for the attenuation of self-stimulation were studied with Myotis lucifugus. The acoustic middle-ear-muscle reflex could perfectly and transiently regulate the amplitude of an incoming signal only at its beginning. However, its shortest latency in terms of electromyograms and of the attenuation of the cochlear microphonic was 3–4 and 4–8 msec, respectively, so that these muscles failed to attenuate orientation signals by the reflex. The muscles, however, received a message from the vocalization system when the bat vocalized, and contracted synchronously with vocalization. The duration of the contraction-relaxation was so short that the self-stimulation was attenuated, but the echoes were not. The tetanus-fusion frequency of tha stapedium muscle ranged between 260 and 320/sec. Unlike the efferent fibres in the lateral-line and vestibular systems, the olivo-cochlear bundle showed no sign of attenuation of self-stimulation.

Food Deprivation, Estrogen Levels and Self-Stimulation in the Female Rat

1971 ◽  
Vol 29 (2) ◽  
pp. 655-665 ◽  
Author(s):  
Irmingard I. Lenzer
Keyword(s):  
Food Deprivation ◽  
Dorsal Hippocampus ◽  
The Self ◽  
Albino Rats ◽  
Female Rat ◽  
Stimulation Rate ◽  
Motivational Systems ◽  
Estrogen Effects ◽  
Self Stimulation ◽  
The Brain

The effects of two concurrently changing drive variables, food deprivation and estrogen level, on the self-stimulation rate in the hypothalamus, septum, caudate nucleus, or dorsal hippocampus of 15 female albino rats were studied. When the effects of hunger were calculated using only scores on days of diestrus and the effects of estrogen were calculated using only scores on days of 0-hr. food deprivation, the correlation of these hunger and estrogen effects amounted to 0.67. When the hunger effects were calculated using only scores on days of estrus and these hunger effects correlated with the previously calculated estrogen effects, the correlation amounted to −0.49. These results are consistent with the concept of diffuse overlapping motivational systems in the brain. Controls indicated that the changes in self-stimulation rate were not artifacts of changes in nonspecific activity.

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