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Related Experiment Video

Updated: Aug 26, 2025

Pavlovian Conditioned Approach Training in Rats

Pavlovian Conditioned Approach Training in Rats

Published on: February 4, 2016

Reward-Mediated, Model-Free Reinforcement-Learning Mechanisms in Pavlovian and Instrumental Tasks Are Related.

Neema Moin Afshar¹, François Cinotti², David Martin³

¹Department of Psychiatry, Yale School of Medicine, New Haven, Connecticut 06511.

The Journal of Neuroscience : the Official Journal of the Society for Neuroscience

|October 10, 2022

Summary

Reinforcement learning mechanisms in rats show conserved model-free computations across Pavlovian and instrumental tasks. Sign-tracking behavior is linked to model-free learning, suggesting common pathways for associative learning.

Keywords:

computational psychiatry decision-making incentive salience model-based learning model-free learning

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Last Updated: Aug 26, 2025

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Area of Science:

Neuroscience
Computational Psychiatry
Behavioral Economics

Background:

Model-free and model-based computations distinctly update action values in decision-making.
It remains unclear if these reinforcement learning (RL) mechanisms are conserved across Pavlovian and instrumental tasks.
Individual differences in incentive salience attribution (sign-tracking vs. goal-tracking) may relate to RL variations.

Purpose of the Study:

To investigate if Pavlovian and instrumental learning processes are driven by common RL mechanisms.
To assess the conservation of model-free and model-based RL systems across different behavioral tasks in individual animals.
To examine the association between sign-tracking/goal-tracking behaviors and RL strategies.

Main Methods:

A within-subject design was employed in male rats.
Sign-tracking and goal-tracking behaviors were assessed using a Pavlovian conditioned approach task.
Instrumental behavior was characterized using a multistage decision-making (MSDM) task.

Main Results:

Sign-tracking behavior was significantly associated with greater model-free RL.
Model-free RL in the Pavlovian task correlated with model-free RL in the MSDM task.
No significant association was found between sign-tracking and model-based RL.

Conclusions:

Pavlovian and instrumental learning processes appear to be driven by conserved reinforcement-learning mechanisms, particularly model-free computations.
Sign-tracking behavior is a reliable indicator of heightened model-free RL.
These findings offer insights into the computational underpinnings of associative learning with implications for understanding normal and abnormal states.