The Memory System Engaged During Acquisition Determines the Effectiveness of Different Extinction Protocols.

Area of Science:

• Neuroscience
• Behavioral Psychology
• Memory Research

Background:

• Extinction of learned behaviors can occur without explicit response performance.
• Latent extinction, where animals are confined to a familiar location without reward, is one such method.
• Previous studies have not clarified if latent extinction is effective for all memory types.

Purpose of the Study:

• To investigate the efficacy of latent extinction across different memory systems.
• To compare latent extinction with response extinction in hippocampus-dependent and dorsolateral striatum-dependent tasks.

Main Methods:

• Rats were trained on a hippocampus-dependent place learning task or a dorsolateral striatum-dependent response learning task.
• Following training, animals underwent either response extinction or latent extinction.
• Response extinction involved performing the learned response to an empty reward site.
• Latent extinction involved confinement to the goal location without performing the response.

Main Results:

• Latent extinction successfully extinguished memory in the place learning task.
• Latent extinction was ineffective for the response learning task.
• Response extinction effectively extinguished memory in both learning tasks.

Conclusions:

• The effectiveness of latent extinction depends on the type of memory being extinguished.
• Hippocampus-dependent memories are susceptible to latent extinction, while striatum-dependent memories are not.
• Behavioral treatments based on response extinction may be beneficial for conditions involving striatum-dependent memory, such as addiction.