A transformation from temporal to ensemble coding in a model of piriform cortex.

Abstract:

:Different coding strategies are used to represent odor information at various stages of the mammalian olfactory system. A temporal latency code represents odor identity in olfactory bulb (OB), but this temporal information is discarded in piriform cortex (PCx) where odor identity is instead encoded through ensemble membership. We developed a spiking PCx network model to understand how this transformation is implemented. In the model, the impact of OB inputs activated earliest after inhalation is amplified within PCx by diffuse recurrent collateral excitation, which then recruits strong, sustained feedback inhibition that suppresses the impact of later-responding glomeruli. We model increasing odor concentrations by decreasing glomerulus onset latencies while preserving their activation sequences. This produces a multiplexed cortical odor code in which activated ensembles are robust to concentration changes while concentration information is encoded through population synchrony. Our model demonstrates how PCx circuitry can implement multiplexed ensemble-identity/temporal-concentration odor coding.

journal_name

Elife

journal_title

eLife

authors

Stern M,Bolding KA,Abbott LF,Franks KM

doi

10.7554/eLife.34831

subject

Has Abstract

pub_date

2018-03-29 00:00:00

issn

2050-084X

pii

34831

journal_volume

7

pub_type

杂志文章

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