Conditioned suppression of behavior maintained by cocaine self-administration.

Area of Science:

• Behavioral neuroscience
• Addiction research

Background:

• Conditioned suppression effectively reduces behavior maintained by various rewards.
• The application of conditioned suppression to drug-maintained behavior, specifically cocaine self-administration, remains unexplored despite its potential for addiction treatment.

Purpose of the Study:

• To investigate the efficacy of the conditioned suppression paradigm in reducing cocaine self-administration in rats.
• To determine if environmental stimuli associated with aversive events (shock) can suppress drug-seeking behavior.
• To examine the effects of combining conditioned stimuli on cocaine self-administration.

Main Methods:

• Rats were trained to self-administer cocaine intravenously under a variable-interval schedule.
• Tone and light stimuli were paired with foot-shock during cocaine self-administration to establish them as conditioned stimuli (CSs).
• The suppressive effects of individual CSs and their simultaneous presentation on cocaine self-administration were assessed.

Main Results:

• Both tone and light conditioned stimuli reliably suppressed ongoing cocaine self-administration in all subjects.
• Simultaneous presentation of the tone and light CSs resulted in significantly enhanced suppression compared to individual CSs.
• These findings indicate that aversive stimuli can indeed suppress cocaine-maintained behavior.

Conclusions:

• Environmental stimuli associated with non-drug aversive events can effectively suppress cocaine-maintained behavior.
• Combining conditioned stimuli that decrease drug self-administration can amplify their suppressive impact.
• The conditioned suppression paradigm shows promise as a therapeutic strategy for treating drug abuse and addiction.