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Timing and Consequences on Behavior

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Related Experiment Video

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Investigating Motor Skill Learning Processes with a Robotic Manipulandum

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Published on: February 12, 2017

Reinforcement Learning during Adolescence in Rats.

Neema Moin Afshar¹, Alex J Keip¹, Jane R Taylor^1,2

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

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

|July 1, 2020

Summary

This summary is machine-generated.

Adolescent rats show improved decision-making skills in a novel reversal-learning task. These changes are linked to how they update values for positive outcomes, predicting adult behavior.

Keywords:

computational psychiatry meta-learning neurodevelopment reversal learning reward

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Area of Science:

Neuroscience
Developmental Psychology
Behavioral Economics

Background:

Adolescence is a critical period for brain development, with hypothesized improvements in decision-making circuits.
Previous research lacked direct evidence linking adolescent brain changes to enhanced decision-making due to translation challenges in preclinical models.

Purpose of the Study:

To develop and validate a novel reversal-learning protocol for assessing adaptive choice behavior in adolescent rats.
To investigate the neurodevelopmental mechanisms underlying decision-making improvements during adolescence using a computational framework.

Main Methods:

A new reversal-learning protocol was implemented in Long-Evans rats from postnatal day 30 onwards.
A computational framework was employed to analyze reinforcement-learning mechanisms.
Cross-sectional and longitudinal study designs were utilized.

Main Results:

Value-based choice behavior and reversal-learning performance significantly improved in adolescent rats (both male and female).
Enhanced reversal performance was attributed to alterations in value updating for positive outcomes.
Adolescent reversal-learning trajectories were found to predict adult performance.

Conclusions:

The novel behavioral protocol offers a robust platform for studying the neurodevelopment of decision-making.
Adolescent improvements in decision-making are driven by specific changes in reinforcement-learning mechanisms, particularly value updating.
This study provides the first direct evidence supporting the hypothesis that adolescent brain adaptations enhance decision-making capabilities.