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Related Experiment Videos

Cholinergic antagonists in ventral tegmentum elevate thresholds for lateral hypothalamic and brainstem

O Kofman1, J S Yeomans

  • 1Department of Psychology, University of Toronto, Canada.

Pharmacology, Biochemistry, and Behavior
|November 1, 1988
PubMed
Summary

Cholinergic receptors in the ventral tegmentum are crucial for self-stimulation behaviors in the brain. Blocking these receptors increases the effort required for self-stimulation, suggesting their role in reward pathways.

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Area of Science:

  • Neuroscience
  • Neuropharmacology
  • Behavioral Neuroscience

Background:

  • Cholinergic systems in the brainstem and ventral tegmentum are implicated in reward and motivation.
  • Self-stimulation paradigms are used to study the neural circuits underlying reward.

Purpose of the Study:

  • To investigate the role of ventral tegmental muscarinic receptors in lateral hypothalamic and brainstem self-stimulation.
  • To determine if cholinergic antagonists affect self-stimulation thresholds.

Main Methods:

  • Microinjections of muscarinic antagonists (atropine, scopolamine) and a choline uptake blocker (hemicholinium-3) into the ventral tegmentum.
  • Electrode placement in the lateral hypothalamus and dorsal tegmentum for self-stimulation.
  • Paired-pulse stimulation to assess interactions between self-stimulation sites.

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Main Results:

  • Microinjections of atropine and scopolamine dose-dependently and time-dependently elevated self-stimulation frequency thresholds.
  • Hemicholinium-3 also increased self-stimulation thresholds.
  • Significant summation was observed between lateral hypothalamic and dorsal tegmental self-stimulation sites, indicating convergence.

Conclusions:

  • Ventral tegmental muscarinic receptors play a significant role in mediating self-stimulation behaviors.
  • The ventral tegmentum is a likely site where reward pathways from the lateral hypothalamus and brainstem converge.