Perirhinal cortex learns a predictive map of the task environment

Area of Science:

• Neuroscience
• Cognitive Science
• Computational Neuroscience

Background:

• Goal-directed behaviors rely on internal predictive models of stimuli and outcomes.
• The neural basis of these predictive maps, especially in the context of learning and memory, remains incompletely understood.

Purpose of the Study:

• To identify neural signatures of a predictive map in the perirhinal cortex (Prh) during a tactile working memory task.
• To elucidate how the Prh encodes stimulus-outcome associations and contributes to goal-directed behavior.

Main Methods:

• Chronic two-photon calcium imaging in mice performing a tactile working memory task.
• Population analysis and computational modeling to decode neural activity.
• Acetylcholine imaging and pharmacological manipulation to assess cholinergic signaling.

Main Results:

• The perirhinal cortex (Prh) encodes stimulus features as sensory prediction errors.
• Stable stimulus-outcome associations in Prh are formed and become decodable earlier with training.
• These associations generalize to new contingencies and are linked to prospective network activity.
• Cholinergic signaling mediates the link between associations and prospective activity, guiding task performance.

Conclusions:

• The perirhinal cortex (Prh) exhibits neural signatures of a predictive map essential for learned task behavior.
• Prh integrates error-driven learning with map-like representations.
• Cholinergic modulation plays a key role in utilizing these predictive representations for guiding behavior.