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Pallidal spiking activity reflects learning dynamics and predicts performance.

Eitan Schechtman1, Maria Imelda Noblejas2, Aviv D Mizrahi2

  • 1Edmond and Lily Safra Centre for Brain Sciences, The Hebrew University of Jerusalem, Safra Campus, Jerusalem, Israel 9190401; eitan.schechtman@mail.huji.ac.il.

Proceedings of the National Academy of Sciences of the United States of America
|September 28, 2016
PubMed
Summary
This summary is machine-generated.

The external segment of the globus pallidus (GPe) shows learning-related activity, predicting behavioral shifts during reversal learning tasks. Its neural activity reflects cognitive processes beyond motor control.

Keywords:
actor–critic modelattentionbasal gangliaglobus palliduslearning

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Area of Science:

  • Neuroscience
  • Cognitive Neuroscience
  • Computational Neuroscience

Background:

  • The basal ganglia (BG) network is crucial for learning and decision-making.
  • Existing models often focus on the striatum, neglecting downstream BG nuclei like the external globus pallidus (GPe).
  • The computational role of the GPe in learning remains largely unexplored.

Purpose of the Study:

  • To investigate the learning-related neural activity in the external segment of the globus pallidus (GPe).
  • To understand the GPe's role in cognitive functions, particularly during reversal learning.

Main Methods:

  • Electrophysiological recordings from monkeys performing a deterministic three-choice reversal learning task.
  • Analysis of GPe neuronal discharge rates in relation to behavioral shifts and learning dynamics.
  • Comparison of GPe activity with striatal tonically active neurons.

Main Results:

  • GPe discharge rates predicted trial-by-trial behavioral shifts during the reversal learning task.
  • GPe activity encoded reward outcomes following choice shifts and matched across-trial learning dynamics.
  • GPe firing rates decreased with correct response sequences, suggesting a shift towards automaticity.
  • Unlike striatal neurons, GPe activity showed significant task-related modulations.

Conclusions:

  • The external segment of the globus pallidus (GPe) plays a significant role in cognitive functions, including learning and decision-making.
  • GPe activity is modulated by attention-demanding aspects of behavior and decreases as performance becomes automatic.
  • These findings highlight the GPe's involvement in cognitive processes, extending beyond its traditional motor functions.