Search results for " Operant"

Effetti dell'esposizione a tracce di anestetici volatili sulle diverse professionalità operanti in sala operatoria a prevalente indirizzo pediatrico.

2011

Anti-anhedonic actions of the novel serotonergic agent flibanserin, a potential rapidly-acting antidepressant

1998

Chronic exposure to mild unpredictable stress has previously been found to depress the consumption of palatable sweet solutions and to block the formation of conditioned place preferences; these effects are reversed by chronic treatment with tricyclic or atypical antidepressant drugs. The present study was designed to evaluate the antidepressant-like activity in this model of flibaserin (BIMT-17), a novel serotonergic agent with 5-HT1A receptor agonist and 5-HT2 receptor antagonist properties. Two experiments were conducted, using rats (experiment 1) and mice (experiment 2). In experiment 1, decreases in sucrose intake were seen in rats exposed to chronic mild stress, but the effect was unr…

Reinstatement of Morphine-Induced Conditioned Place Preference in Mice by Priming Injections

2004

To construct a model of relapse of drug abuse in mice, the induction, we evaluated the extinction and reinstatement of morphine-induced place preference. In Experiment 1, we examined the effects of morphine (0, 2, 3, 5, 10, 20 and 40 mg/kg) in the conditioned place preference (CPP) paradigm. Mice showed CPP with 5, 10, 20 and 40 mg/kg. In Experiment 2, we evaluated the effects of two different extinction procedures. After conditioning with 40 mg/kg of morphine, the mice underwent daily extinction sessions of 60 or 15 min of duration. CPP was extinguished after seven and nine sessions, respectively. In Experiment 3, we tested the reinstating effects of several priming doses of morphine. Mice…

Expression of Fos in the piriform cortex after acquisition of olfactory learning: An immunohistochemical study in the rat

2001

The piriform cortex (PCx), the main area of the primary olfactory cortex, is assumed to play a role in olfactory memory. Involvement of this paleocortex in mnesic processes was investigated by using Fos immunocytochemistry after acquisition of a two-odor discrimination task. Trained rats had to associate one odor of a pair with water reward while pseudo-trained rats were randomly rewarded. We further used non-trained rats and home cage control animals to determine the effect of manipulation and basal Fos level respectively. Except in control rats, Fos immunoreactivity was mainly distributed in brain areas involved in olfactory processing, learning and arousal. The trained, pseudo-trained, a…

El empleado como recurso operante en la cocreación de valor: aplicación al ámbito de salud

2023

En el contexto sanitario actual, la investigación de la cocreación de valor desde la perspectiva del marketing ha experimentado un aumento sostenido. Frow et al. (2016) destacan que la atención sanitaria representa un contexto de servicio importante para investigar la cocreación de valor debido al reconocimiento generalizado de la importancia de las actividades colaborativas entre los diversos actores en la obtención de resultados beneficiosos para la salud. Si bien la participación del paciente en el proceso de cocreación de valor ha recibido una considerable atención en la literatura reciente, la cocreación liderada por los empleados está notoriamente ausente. Sin embargo, Palumbo (2016) …

Color choice behavior in cats and the effect of changes in the color of the illuminant.

1993

Reinstatement of Drug-seeking in Mice Using the Conditioned Place Preference Paradigm

2018

The present protocol describes the Conditioned Place Preference (CPP) as a model of relapse in drug addiction. In this model, animals are first trained to acquire a conditioned place preference in a drug-paired compartment, and after the post-conditioning test, they perform several sessions to extinguish the established preference. The CPP permits the evaluation of the conditioned rewarding effects of drugs related to environmental cues. Then, the extinguished CPP can be robustly reinstated by the non-contingent administration of a priming dose of the drug, and by exposure to stressful stimuli. Both methods will be explained here. When the animal reinitiates the behavioral response, a reins…

CB1 cannabinoid receptor-mediated aggressive behavior

2013

This study examined the role of cannabinoid CB1 receptors (CB1r) in aggressive behavior. Social encounters took place in grouped and isolated mice lacking CB1r (CB1KO) and in wild-type (WT) littermates. Cognitive impulsivity was evaluated in the delayed reinforcement task (DRT). Gene expression analyses of monoaminooxidase-A (MAO-A), catechol-o-methyl-transferase (COMT), 5-hydroxytriptamine transporter (5-HTT) and 5-HT1B serotonergic receptor (5HT1Br) in the median and dorsal raphe nuclei (MnR and DR, respectively) and in the amygdala (AMY) were performed by real time-PCR. Double immunohistochemistry studies evaluated COMT and CB1r co-localization in the raphe nuclei and in the cortical (AC…

The novelty-seeking phenotype modulates the long-lasting effects of adolescent MDMA exposure.

2015

Exposure to drugs such as ethanol or cocaine during adolescence induces alterations in the central nervous system that are modulated by the novelty-seeking trait. Our aim was to evaluate the influence of this trait on the long-term effects of MDMA administration during adolescence on spontaneous behavior and conditioned rewarding effects in adulthood. Adolescent mice were classified as high or low novelty seekers (HNS or LNS) according to the hole-board test and received either MDMA (0, 10 or 20mg/kg PND 33-42) or saline. Three weeks later, having entered adulthood (PND>68), one set of mice performed the elevated plus maze and social interaction tests, while another set performed the condit…

Role of dopamine neurotransmission in the long-term effects of repeated social defeat on the conditioned rewarding effects of cocaine

2016

Numerous studies report that social defeat stress alters dopamine (DA) neurotransmission in several areas of the brain. Alterations of the mesolimbic dopaminergic pathway are believed to be responsible for the increased vulnerability to drug use observed as a result of social stress. In the present study, we evaluated the influence of DA receptors on the long-term effect of repeated social defeat (RSD) on the conditioned rewarding and reinstating effects of cocaine. For this purpose, the D1R antagonist SCH 23390 and the D1R antagonist raclopride were administered 30 min before each social defeat and a cocaine-induced CPP procedure was initiated three weeks later. The expression of the D1R a…