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Published on: June 3, 2016
Pyramidal cells in piriform cortex receive convergent input from distinct olfactory bulb glomeruli
Alfonso Apicella1, Qi Yuan, Massimo Scanziani
1Center for Neural Circuits and Behavior, Neuroscience Department, School of Medicine, Neurobiology Section, Division of Biology, and Howard Hughes Medical Institute, University of California, San Diego, La Jolla, California 92093-0634, USA.
Summary
Pyramidal cells in the piriform cortex receive input from different olfactory bulb glomeruli. This convergence, crucial for olfactory discrimination, activates neuronal ensembles cooperatively within a specific time window.
Area of Science:
- Neuroscience
- Olfactory System Research
- Sensory Integration
Background:
- Pyramidal cells in the piriform cortex integrate sensory information from olfactory bulb mitral and tufted (M/T) cells.
- The convergence of M/T cells from different olfactory bulb glomeruli onto individual cortical neurons remains unclear.
Purpose of the Study:
- To provide direct evidence for glomerular convergence onto piriform cortex neurons.
- To investigate the functional consequences of this convergence on cortical activity and olfactory processing.
Main Methods:
- Utilized calcium imaging in an olfactory bulb-cortex slice preparation.
- Recorded neuronal activity in response to stimulation of distinct glomerular pathways.
Main Results:
- Demonstrated that piriform cortex neurons receive convergent synaptic input from different olfactory bulb glomeruli.
- Showed that combined activity of distinct glomerular pathways recruits pyramidal cell ensembles not activated by individual pathways alone.
- Identified this cooperative recruitment occurs within a narrow time window and is intrinsic to the olfactory cortex.
Conclusions:
- Cooperative recruitment of cortical neurons by convergent glomerular input enhances differences in cortical representations of overlapping olfactory patterns.
- This mechanism likely contributes to the initial stages of olfactory discrimination.
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