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Norepinephrine and serotonin: Specificity of release with rewarding electrical stimulation of the brain
Authors:Joan A. Holloway
Affiliation:(1) University of Oklahoma Health Sciences Center, USA
Abstract:
Using a push-pull cannula method the amygdala of rats was perfused to examine the release of labeled norepinephrine (NE) and labeled serotonin (5-HT) during electrical stimulation of the brain (ESB) determined by prior behavioral testing to be rewarding or non-rewarding. Simple sensory stimulation was used during perfusion to examine further the degree of specificity of release of these amines. Highly rewarding ESB, but not the sensory stimulation, was accompanied by release of both NE and 5-HT. Varying current intensity had significant effects on the amount of these amines released. Furthermore, non-rewarding ESB was accompanied by inhibition of release of NE and 5-HT and a control substance, urea, was not significantly released during rewarding ESB. The results were discussed as implicating both noradrenergic and serotonergic mechanisms in the mediation of reinforcement.
Keywords:Norepinephrine  Serotonin  Release of Transmitters  Electrical Stimulation of the Brain  Reinforcement  Push-Pull Cannula
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