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Learning-induced enhancement of postsynaptic potentials in pyramidal neurons
Drorit Saar1, Yoram Grossman, Edi Barkai
1Department of Physiology, Faculty of Health Sciences and Zlotowski Center for Neuroscience, Ben-Gurion University of the Negev, Beer-Sheva 84105, Israel.
Journal of Neurophysiology
|April 27, 2002
Summary
Olfactory learning modifies piriform cortex neurons, making postsynaptic potentials (PSPs) propagate faster. This suggests learned odors electrotonically bring PSPs closer to the neuron
Area of Science:
- Neuroscience
- Olfactory System Research
- Cellular Electrophysiology
Background:
- The piriform cortex is crucial for olfactory processing.
- Olfactory learning induces synaptic plasticity in the piriform cortex.
- Understanding how neuronal excitability changes post-learning is key to olfactory memory.
Purpose of the Study:
- To investigate how olfactory learning affects postsynaptic potential (PSP) propagation in piriform cortex pyramidal neurons.
- To determine if learned odor discrimination alters neuronal electrotonic structure.
Main Methods:
- Rats underwent odor discrimination training.
- Postsynaptic potentials (PSPs) were recorded in piriform cortex slices.
- Two pathways (intrinsic and afferent) were stimulated to evoke PSPs.
- The effect of slow afterhyperpolarization (AHP) on PSPs was analyzed.
Main Results:
- Neurons from trained rats showed faster PSP rise times compared to controls.
- Despite reduced AHP amplitude, AHP conductance more effectively shunted PSPs in trained rats.
- This indicates a more efficient shunting effect from the slow afterhyperpolarization.
Conclusions:
- Olfactory learning alters the electrotonic properties of piriform cortex neurons.
- PSPs in trained rats appear electrotonically closer to the soma.
- These changes may underlie enhanced olfactory memory formation.