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Using hippocampal-striatal loops for spatial navigation and goal-directed decision-making.

Fabian Chersi¹, Giovanni Pezzulo

¹Institute of Cognitive Sciences and Technologies, CNR, Via S. Martino della Battaglia 44, 00185, Rome, Italy. fabian.chersi@istc.cnr.it

Cognitive Processing

|July 19, 2012

Summary

This study models how the hippocampus and ventral striatum work together for decision-making. It shows how place cells simulate navigation paths and evaluate rewards, aiding goal-directed behavior.

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Area of Science:

Neuroscience
Computational Neuroscience
Cognitive Science

Background:

The hippocampus is crucial for spatial memory and navigation.
Place cells in the hippocampus exhibit spatial selectivity and can fire outside their place fields ('forward sweeps').
The ventral striatum, linked to the hippocampus, is involved in reward processing and value encoding.

Purpose of the Study:

To develop a computational model of the hippocampal-ventral striatum circuit for goal-directed choice.
To investigate the roles of the hippocampus in mental simulation and the ventral striatum in reward evaluation during navigation.

Main Methods:

A biologically based computational model of the hippocampal-ventral striatum circuit was created.
The model was validated using a rat navigation task in a complex maze with multiple reward sites.

Main Results:

The model demonstrated that place cells simulate navigation paths and estimate their value.
The simulation of paths and value estimation facilitate decision-making, mimicking model-based reinforcement learning.

Conclusions:

The hippocampus and ventral striatum circuit supports goal-directed navigation through mental simulation and reward prediction.
This model provides insight into the neural mechanisms underlying choice behavior and reinforcement learning.