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The thalamus, often called “the gateway to the cerebral cortex,” is vital in processing and directing sensory and motor signals throughout the brain. Almost all inputs destined for the cerebral cortex, except for olfactory signals, are relayed through the thalamus. The thalamus is  a sophisticated relay station, channeling information from various brain regions to the cerebral cortex, as well as a filter, prioritizing certain signals over others based on current physiological...
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Nucleus Accumbens Shell Neurons Encode the Kinematics of Reward Approach Locomotion.

David Levcik1, Adam H Sugi2, Marcelo Aguilar-Rivera3

  • 1Laboratório de Fisiologia e Farmacologia do Sistema Nervoso Central, Universidade Federal do Paraná, 81531-980 Curitiba, Brazil; Institute of Physiology of the Czech Academy of Sciences, Videnska 1083, 142 20 Prague, Czech Republic.

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|June 17, 2023
PubMed
Summary

Neurons in the nucleus accumbens (NAc) encode movement towards rewards. Specific neuron types control locomotion initiation, speed, and deceleration, influencing reward approach behavior.

Keywords:
Nucleus accumbensinitiation of actionkinematics encodinglocomotor speedreward approach

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Area of Science:

  • Neuroscience
  • Behavioral Neuroscience
  • Motor Control

Background:

  • The nucleus accumbens (NAc) is a key brain region linking motivation and action.
  • Understanding how NAc neurons encode reward-seeking behaviors is crucial for explaining motivation-action interfaces.

Purpose of the Study:

  • To investigate the role of nucleus accumbens (NAc) neurons in encoding locomotor approach to reward.
  • To identify specific neuronal firing patterns associated with different phases of reward-seeking movement.

Main Methods:

  • Electrophysiological recordings of 62 NAc neurons in male Wistar rats (n=5).
  • Rats were trained to run towards rewarded locations in an 8-arm radial maze.
  • Analysis focused on correlating neuronal firing rates with locomotor approach kinematics (speed, acceleration).

Main Results:

  • Locomotor approach kinematics were the primary predictors of NAc neuronal firing rates.
  • Three distinct neuronal populations were identified: locomotion-off cells (inhibited during approach), acceleration-on cells (peaked during acceleration), and deceleration-on cells (peaked during deceleration).
  • These cell types were significantly involved in encoding speed and acceleration during approach.

Conclusions:

  • NAc neurons exhibit diverse firing patterns that encode different aspects of locomotor approach to reward.
  • Specific neuronal populations (locomotion-off, acceleration-on, deceleration-on) appear to regulate the initiation, speed, and deceleration phases of reward-directed movement.
  • These findings elucidate the neural mechanisms by which the NAc translates motivation into goal-directed action.