Trial-based Discrimination Procedure for Studying Drug Relapse in Rats

Area of Science:

• Neuroscience
• Behavioral Science
• Addiction Research

Background:

• Drug addiction relapse is a major clinical challenge.
• Cues associated with drug use can trigger relapse in abstinent individuals.
• Existing animal models often focus on conditioned stimuli (CSs) rather than discriminative stimuli (DSs).

Purpose of the Study:

• To detail a behavioral protocol for studying discriminative stimuli (DSs) in the context of drug relapse.
• To investigate the incubation of drug craving and seeking behavior mediated by DSs.
• To provide a foundation for future neurobiological investigations into DS-mediated relapse.

Main Methods:

• Rats were trained to discriminate between two light cues: one signaling cocaine availability (DS+) and another signaling its absence (DS-).
• A trial-based procedure was employed, requiring lever pressing during DS+ and suppression during DS-.
• The protocol facilitates time-locked in vivo recordings and manipulations.

Main Results:

• Rats successfully learned to discriminate between the DS+ and DS- cues.
• Cocaine seeking behavior controlled by DSs was shown to incubate during abstinence.
• This DS-controlled seeking persisted for up to 300 days of abstinence.

Conclusions:

• Discriminative stimuli (DSs) play a significant role in drug relapse.
• The incubation of DS-controlled drug seeking is a robust phenomenon in animal models.
• This protocol enables detailed neurobiological studies of DS contributions to addiction and relapse prevention strategies.