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Scopolamine enhances generalization between odor representations in rat olfactory cortex.

¹Department of Zoology, University of Oklahoma, Norman, Oklahoma 73019, USA. dwilson@ou.edu

Learning & Memory (Cold Spring Harbor, N.Y.)

|October 5, 2001

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Acetylcholine (ACh) enhances odor memory and discrimination by modulating piriform cortex activity. Blocking muscarinic receptors with scopolamine improved cross-habituation, suggesting ACh normally reduces odor generalization.

Area of Science:

Neuroscience
Olfactory System Research
Sensory Processing

Background:

Acetylcholine (ACh) plays a key role in sensory system plasticity.
Behavioral and physiological data suggest ACh is vital for odor memory and synaptic plasticity in rats.
Neural network models propose ACh muscarinic receptors minimize interference in piriform cortex odor representations.

Purpose of the Study:

To investigate the role of acetylcholine (ACh) muscarinic receptors in odor memory and discrimination within the rat anterior piriform cortex (aPCX).
To determine if scopolamine, a muscarinic receptor antagonist, affects odor receptive fields or cross-habituation in the aPCX.
To elucidate the modulatory control of ACh over olfactory sensory processes.

Main Methods:

Mapped odor receptive fields of rat aPCX single-units for alkane odors.

Related Experiment Videos

Administered systemic scopolamine or applied it to the aPCX surface, using saline/ACSF as controls.

Examined cross-habituation between alkanes after a 50-sec habituating stimulus.

Main Results:

Scopolamine did not alter spontaneous or odor-evoked activity in the aPCX.
Both systemic and cortical scopolamine significantly enhanced cross-habituation between similar odor representations.
Scopolamine selectively increased generalization between odor representations in the aPCX during a memory task.

Conclusions:

ACh, acting via muscarinic receptors, modulates odor memory and discrimination.
The findings support a role for the intracortical association system in odor memory and discrimination.
ACh exerts significant modulatory control over olfactory sensory processing and generalization.