Impaired object recognition following prolonged withdrawal from extended-access cocaine self-administration

Area of Science:

• Neuroscience
• Cognitive Psychology
• Addiction Research

Background:

• Cocaine addiction is associated with persistent cognitive deficits, particularly in executive functions and memory.
• While preclinical studies show cocaine impacts executive functions, evidence for persistent hippocampal-dependent memory deficits is less clear.

Purpose of the Study:

• To investigate the impact of limited versus extended access to cocaine self-administration on recognition memory.
• To determine if cocaine-induced recognition memory deficits persist after abstinence.

Main Methods:

• Rats were given limited or extended access to self-administered cocaine.
• Recognition memory was assessed using a task sensitive to hippocampal function.
• Cognitive performance was evaluated after a drug abstinence period.

Main Results:

• Extended access to cocaine self-administration resulted in significant deficits in recognition memory.
• These memory impairments persisted for at least two weeks following cocaine cessation.
• Limited access did not produce persistent recognition memory deficits.

Conclusions:

• Repeated, extended cocaine use can induce persistent deficits in hippocampal-dependent recognition memory.
• These findings suggest that cognitive impairments in cocaine addiction may stem from drug use itself, not solely pre-existing conditions.
• Models using extended access to self-administered cocaine are valuable for studying the neural basis of persistent cognitive deficits in addiction.