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Updated: May 28, 2026
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A Lateralized Odor Learning Model in Neonatal Rats for Dissecting Neural Circuitry Underpinning Memory Formation
Published on: August 18, 2014
Recurrent circuitry dynamically shapes the activation of piriform cortex.
Kevin M Franks1, Marco J Russo, Dara L Sosulski
1Department of Neuroscience, College of Physicians and Surgeons, Columbia University, New York, NY 10032, USA.
Neuron
|October 11, 2011
Summary
The piriform cortex has a widespread excitatory network that can influence olfactory bulb input. This recurrent circuitry shapes how neural ensembles encode odor information.
Area of Science:
- Neuroscience
- Olfactory system research
- Computational neuroscience
Background:
- The piriform cortex processes olfactory information, with odorants activating distributed neuronal ensembles.
- Pyramidal neurons in the piriform cortex receive convergent inputs and possess extensive recurrent connections.
Purpose of the Study:
- To investigate the intrinsic circuits of the piriform cortex using channelrhodopsin.
- To determine the contribution of these circuits to activity driven by olfactory bulb inputs.
Main Methods:
- Optogenetic activation using channelrhodopsin in the piriform cortex.
- Characterization of excitatory and inhibitory neuronal connectivity.
- Analysis of network dynamics and input modulation.
Main Results:
- Individual pyramidal cells are sparsely interconnected by a long-range excitatory network.
- This excitatory network can modulate and potentially dominate olfactory bulb input.
- Pyramidal cells activate local inhibitory interneurons, creating feedback inhibition that scales with excitation.
Conclusions:
- The piriform cortex possesses a powerful recurrent excitatory network that significantly influences sensory processing.
- This intrinsic circuitry dynamically shapes neuronal ensemble activity, potentially encoding odorant identity.
- Feedback inhibition plays a crucial role in regulating network activity and sensory input.
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