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Dynamics Learning Rate Bias in Pigeons: Insights from Reinforcement Learning and Neural Correlates

Authors :
Fuli Jin
Lifang Yang
Long Yang
Jiajia Li
Mengmeng Li
Zhigang Shang
Source :
Animals, Vol 14, Iss 3, p 489 (2024)
Publication Year :
2024
Publisher :
MDPI AG, 2024.

Abstract

Research in reinforcement learning indicates that animals respond differently to positive and negative reward prediction errors, which can be calculated by assuming learning rate bias. Many studies have shown that humans and other animals have learning rate bias during learning, but it is unclear whether and how the bias changes throughout the entire learning process. Here, we recorded the behavior data and the local field potentials (LFPs) in the striatum of five pigeons performing a probabilistic learning task. Reinforcement learning models with and without learning rate biases were used to dynamically fit the pigeons’ choice behavior and estimate the option values. Furthemore, the correlation between the striatal LFPs power and the model-estimated option values was explored. We found that the pigeons’ learning rate bias shifted from negative to positive during the learning process, and the striatal Gamma (31 to 80 Hz) power correlated with the option values modulated by dynamic learning rate bias. In conclusion, our results support the hypothesis that pigeons employ a dynamic learning strategy in the learning process from both behavioral and neural aspects, providing valuable insights into reinforcement learning mechanisms of non-human animals.

Details

Language :
English
ISSN :
14030489 and 20762615
Volume :
14
Issue :
3
Database :
Directory of Open Access Journals
Journal :
Animals
Publication Type :
Academic Journal
Accession number :
edsdoj.1252e4da7e54a7b8ea11244f1e09659
Document Type :
article
Full Text :
https://doi.org/10.3390/ani14030489