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Extracellular dopamine increases in the neonatal olfactory bulb during odor preference training
R Coopersmith1, F B Weihmuller, C L Kirstein
1Department of Psychobiology, University of California, Irvine 92717.
Brain Research
|November 8, 1991
Summary
Early olfactory learning in young rats involves significant dopamine release in the olfactory bulb. Combining odor and tactile stimulation dramatically increases dopamine levels, potentially driving long-term neural changes.
Area of Science:
- Neuroscience
- Olfactory Learning
- Neurobiology
Background:
- Young rats form olfactory preferences when odors are paired with tactile stimulation.
- This learning process is associated with anatomical and metabolic changes in the olfactory bulb's glomerular layer.
Purpose of the Study:
- To investigate neurochemical changes in the olfactory bulb during the early stages of olfactory learning.
- To determine if combined odor and tactile stimulation modifies the response of olfactory bulb neurons.
Main Methods:
- In vivo microdialysis was used to measure extracellular dopamine (DA) and its metabolites in the olfactory bulbs of postnatal day 3 rats.
- Rats were exposed to combinations of odor, tactile stimulation, or clean air.
Main Results:
- Odor or tactile stimulation alone increased DA by approximately 200% above baseline.
- Simultaneous odor and tactile stimulation, which establishes olfactory preference, increased DA by approximately 400% above baseline.
- The DA metabolite DOPAC increased by approximately 200% only when both stimuli were presented; HVA increased in all stimulated groups.
Conclusions:
- Early olfactory learning, particularly when associating odor with tactile reward, triggers a substantial and prolonged increase in olfactory bulb dopamine.
- This heightened dopamine activity may underlie the subsequent anatomical and physiological adaptations observed in the olfactory bulb's glomerular layer.