Behavioral flexibility and response selection are impaired after limited exposure to oxycodone

Area of Science:

• Neuroscience
• Behavioral Pharmacology
• Cognitive Psychology

Background:

• Behavioral flexibility is crucial for adapting to changing environments and goals.
• Addictive drugs, such as oxycodone, may disrupt decision-making processes by altering reward computations.
• This disruption could contribute to maladaptive drug use patterns.

Purpose of the Study:

• To investigate the effects of oxycodone exposure on behavioral flexibility in rats.
• To determine if oxycodone impairs learning and memory tasks that require distinct strategies and neural circuits.
• To assess if impaired decision-making is a persistent consequence of oxycodone exposure.

Main Methods:

• Rats were trained on spatial or body-turn discrimination tasks on a radial maze.
• Following training, rats received daily oxycodone or vehicle injections for five days.
• Reversal learning was assessed 36 hours after the final drug exposure in a drug-free state.

Main Results:

• Oxycodone exposure significantly impaired spatial reversal learning, particularly when reward contingencies changed rapidly.
• Oxycodone-exposed rats required more trials, made more perseverative errors, and showed increased post-correction errors during rapid reversals.
• Similar impairments in behavioral flexibility were observed in the body-turn reversal learning task.

Conclusions:

• Limited oxycodone exposure reduces behavioral flexibility in rats, even when tested drug-free.
• Impaired decision-making appears to be an enduring consequence of oxycodone exposure.
• These findings highlight the potential for lasting cognitive deficits associated with opioid use.