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One-trial olfactory learning enhances olfactory bulb responses to an appetitive conditioned odor in 7-day-old rats
1Department of Psychobiology, University of California, Irvine 92717.
Insights
Neonatal rat pups learned to prefer an odor after a single conditioning trial pairing it with tactile stimulation. This olfactory learning was linked to increased [14C]2-deoxyglucose (2-DG) uptake in the olfactory bulb.
Area of Science:
- Neuroscience
- Olfactory learning
- Behavioral conditioning
Background:
- The olfactory bulb is crucial for processing scent information.
- Understanding how olfactory learning occurs in early development is important.
- Classical conditioning can shape sensory preferences.
Purpose of the Study:
- To investigate olfactory learning in neonatal rats.
- To examine the neural correlates of conditioned odor preference in the olfactory bulb.
- To determine if a single conditioning trial can induce lasting olfactory changes.
Main Methods:
- Neonatal rat pups underwent olfactory classical conditioning, pairing peppermint odor with tactile stimulation.
- Control groups received only odor, only stimulation, or neither.
- Olfactory bulb activity was measured using [14C]2-deoxyglucose (2-DG) uptake.
- Behavioral tests assessed odor preference.
Main Results:
- Pups conditioned with simultaneous odor and tactile stimulation showed a preference for the peppermint odor.
- These pups exhibited significantly higher focal 2-DG uptake in the olfactory bulb glomeruli.
- Control groups did not develop a conditioned odor preference or show elevated 2-DG uptake.
Conclusions:
- The olfactory bulb demonstrates differential activity in response to odors that have acquired attractive value through conditioning.
- A single olfactory conditioning experience can lead to measurable behavioral and neural changes.
- This study highlights the plasticity of the neonatal olfactory system.
Abstract:
The expression of a conditioned odor preference and focal uptake of [14C]2-deoxyglucose (2-DG) within the olfactory bulb was assessed in neonatal rat pups that had undergone a single olfactory classical conditioning trial. At 6 days of age, rat pups were simultaneously exposed for 10 min to an odor (peppermint) and to a reinforcing tactile stimulation similar to that received from the dam. Three control groups received only the odor, only the stimulation, or neither of these stimuli. The next day, pups were either assessed for differential olfactory bulb activity using the 2-DG technique or tested for their olfactory preference behavior. Only pups that received simultaneous odor and tactile stimulation exhibited an attraction to the conditioned odor in the two-odor choice test. Furthermore, such pups had greater focal 2-DG uptake in the olfactory bulb glomeruli that were responsive to the odor than pups in all other groups. Thus, the olfactory bulb responds differentially to an odor which has acquired attractive value.