All cells on which stable giga-ohm seals were established and maintained responded to deoxygenation with increased conductance.
WIN55,212-2 self-administration wacquiredred; however, substitution with THC did not maintain responding above vehicle levels.
Furthermore, many experiments that have reported galanin-induced impairments in the performance of tasks thought to measure learning and memory have used water restriction routines and water reinforcers to maintain responding.
Once the animal learned to quickly decrease its responding during sessions when saline was substituted for nicotine (extinction), the dose of nicotine maintaining responding was varied.
We chose this progression because it allows a more precise evaluation of the maximum response requirement that continued to maintain responding (the breaking-point value), than simply doubling the ratio requirement at each step.
The critical role environmental stimuli play in the maintenance of intravenous nicotine self-administration behavior was initially proposed following the description of the ability of nicotine to maintain responding under a second-order schedule of intravenous nicotine self-administration in squirrel monkeys [14].
One model of VS function suggests a role of this region in maintaining responding over long delays (Nicola, 2006).
Subjects behaving in a goal-directed manner should not respond to the CS that predicted the devalued outcome but maintain responding to avoid the valued outcome.
One option is to use continuous reinforcement for reference cues but random reinforcement for ambiguous cues to reduce any new learning but also maintain responding.
In this way, it is possible to determine the ability of alcohol to maintain responding at different concentrations/doses or under different response requirements.
Simply stated, for the first time there was a novel method for killing antihormone-resistant breast cancer cells and then effectively retreating with tamoxifen to maintain responding patients for longer periods.
