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Amphetamine, cocaine, and dizocilpine enhance performance on a lever-release, conditioned avoidance response task in
I M White1, J R Christensen, G S Flory
1Department of Psychology, Indiana University, Bloomington 47405, USA.
Psychopharmacology
|April 1, 1995
Summary
Psychomotor stimulants like d-amphetamine and cocaine improve conditioned avoidance responses (CAR) in rats by affecting dopamine pathways. However, NMDA receptor antagonist dizocilpine shows opposing effects, suggesting complex neurotransmitter interactions in CAR performance.
Area of Science:
- Neuroscience
- Behavioral Pharmacology
- Psychopharmacology
Background:
- The conditioned avoidance response (CAR) is a key behavioral paradigm for studying learning and memory.
- Understanding the neurochemical underpinnings of CAR is crucial for developing treatments for cognitive disorders.
Purpose of the Study:
- To investigate the behavioral effects of psychomotor stimulants on a lever-release CAR task in rats.
- To explore the roles of dopaminergic and glutamatergic systems in CAR performance.
Main Methods:
- Rats were trained on a lever-release CAR task.
- The effects of d-amphetamine, cocaine, dizocilpine (MK-801), and haloperidol, alone and in combination, were assessed.
Main Results:
- Indirect dopamine agonists (d-amphetamine, cocaine) enhanced CAR performance, increasing percent avoidance and decreasing latency.
- Dizocilpine (NMDA receptor antagonist) showed mixed effects, impacting avoidance latency but not always percent avoidance.
- Combinations with haloperidol (dopamine antagonist) revealed differential interactions, with amphetamine-haloperidol favoring avoidance and dizocilpine-haloperidol favoring latency.
Conclusions:
- Results support the involvement of dopaminergic mechanisms in CAR.
- Findings suggest an opposing influence of glutamatergic neurotransmission on CAR performance.
- The study highlights the complex interplay between dopamine and glutamate in modulating avoidance behavior.