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Related Experiment Video

Updated: Jul 12, 2025

A Conflict Model of Reward-seeking Behavior in Male Rats
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Dopaminergic systems create reward seeking despite adverse consequences.

Kristijan D Jovanoski1, Lucille Duquenoy2, Jessica Mitchell2,3

  • 1Centre for Neural Circuits and Behaviour, University of Oxford, Oxford, UK. kdjovanoski@gmail.com.

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|October 25, 2023
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Summary

Fruit flies exhibit unconstrained reward-seeking behavior when specific reward neurons are artificially activated. This suggests dopaminergic system dysfunction may drive maladaptive reward seeking in mammals.

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Area of Science:

  • Neuroscience
  • Behavioral Biology
  • Genetics

Background:

  • Resource-seeking behaviors are normally regulated by needs and dangers.
  • Loss of these controls leads to pathological reward seeking.
  • Dopaminergic system dysfunction is implicated in unconstrained reward seeking, but mechanisms are unclear.

Purpose of the Study:

  • To investigate the dopaminergic neural mechanisms underlying reward seeking despite adverse consequences in Drosophila melanogaster.
  • To understand how specific dopaminergic neuron populations influence reward-seeking behavior.

Main Methods:

  • Optogenetic activation of reward-encoding dopaminergic neurons in fruit flies.
  • Associating odors with neuronal activation to create reward cues.
  • Observing fly behavior in the presence of food, punishment (electric shock), and learned cues.
  • Connectome analysis and neural recordings to study neuronal input and signaling.

Main Results:

  • Flies sought odors paired with artificial reward neuron activation, ignoring food and enduring punishment.
  • This unconstrained seeking was specific to activation of certain dopaminergic neurons and not observed with natural rewards like sugar.
  • Antagonism between reward and punishment neurons explained persistent seeking despite punishment.
  • Activation of reward neurons impaired normal need-dependent food valuation.

Conclusions:

  • Dopaminergic mechanisms can drive reward seeking independent of physiological needs and in the face of punishment.
  • Dysfunction in this dopaminergic valuation system may underlie maladaptive reward-seeking behaviors in mammals.
  • Heterogeneous inputs and state-specific signals modulate reward-encoding dopaminergic neurons.