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The study of imitative learning in animals has suffered from the presence of a number of confounding motivational and attentional factors (e.g., social facilitation and stimulus enhancement). The two-action method avoids these problems by exposing observers to demonstrators performing a response (e.g., operating a treadle) using 1 of 2 distinctive(More)
Drug addiction is characterized by compulsive drug-seeking and drug-taking behavior and by a high rate of relapse even after long periods of abstinence. Although the mesocorticolimbic dopamine (DA) pathway is thought to play a critical role in drug craving and relapse, recent evidence also implicates glutamate, an amino acid known to activate DA neurons in(More)
In the bidirectional control procedure, observers are exposed to a conspecific demonstrator responding to a manipulandum in one of two directions (e.g., left vs. right). This procedure controls for socially mediated effects (the mere presence of a conspecific) and stimulus enhancement (attention drawn to a manipulandum by its movement), and it has the added(More)
Repeated intermittent cocaine treatment often results in behavioral sensitization or an augmented response to cocaine. Cocaine-induced behavioral sensitization may be an important contributor to cocaine addiction and abuse. Some studies have also shown that conditioned drug effects may play a role in behavioral sensitization. The current experiment utilized(More)
The interval between exposure to a conditioned stimulus (CS) to male quail and access to a female (the unconditioned stimulus [US]) was varied from 0.5 to 20 min using a Pavlovian delayed conditioning procedure. Increasing the CS-US interval altered the spatial distribution of sexual conditioned behavior. With a short CS-US interval (1 min), conditioning(More)
The dopamine D1 receptor subtype has been implicated in drug reward processes in mammals. Two experiments investigated whether dose-dependent differences in cocaine conditioned place preference (CPP) would be obtained in an avian species and whether these cocaine effects were mediated by the dopamine D1 antagonist R(+/-)-SCH23390. In Experiment 1, male(More)
The conditioned place preference (CPP) procedure is a popular method used for testing the rewarding properties of human drugs of abuse. Most CPP studies utilize mammalian models. However, avian species have better visual systems than rodent species, and because the cues that become associated with human drug-taking behavior are often visual, Aves might(More)
Two groups of male Japanese quail (Coturnix japonica) were trained [corrected] to discriminate cocaine from saline in a conditioned approach procedure maintained by sexual reinforcement. For 1 group, cocaine (10 mg/kg ip) was administered prior to a conditioned stimulus (CS) that predicted copulation; saline followed by a CS predicted no copulation. A(More)
Sexual experience increases the response of males to stimuli provided by female conspecifics in a variety of species. The mechanisms of learning involved in this type of phenomenon were explored in two experiments with Japanese quail. The results indicated that instrumental conditioning with copulatory opportunity is not necessary for the acquisition of(More)
Chronic cocaine administration typically results in increased locomotor activity, known as behavioral sensitization. Investigating the time course of locomotor activity across trials may provide a more detailed analysis of the temporal changes that might occur within sensitization. Prior research with rodents shows that the peak of locomotor activity shifts(More)