Center-surround vs. distance-independent lateral connectivity in the olfactory bulb.

Abstract:

:Lateral neuronal interactions are known to play important roles in sensory information processing. A center-on surround-off local circuit arrangement has been shown to play a role in mediating contrast enhancement in the visual, auditory, and somatosensory systems. The lateral connectivity and the influence of those connections have been less clear for the olfactory system. A critical question is whether the synaptic connections between the primary projection neurons, mitral and tufted (M/T) cells, and their main inhibitory interneurons, the granule cells (GCs), can support a center-surround motif. Here, we study this question by injecting a "center" in the glomerular layer of the olfactory bulb (OB) with a marker of synaptic connectivity, the pseudorabies virus (PRV), then examines the distribution of labeling in the "surround" of GCs. We use a novel method to score the degree to which the data fits a center-surround model vs. distance-independent connectivity. Data from 22 injections show that M/T cells generally form lateral connections with GCs in patterns that lie between the two extremes.

journal_name

Front Neural Circuits

authors

Kim DH,Chang AY,McTavish TS,Patel HK,Willhite DC

doi

10.3389/fncir.2012.00034

subject

Has Abstract

pub_date

2012-05-31 00:00:00

pages

34

issn

1662-5110

journal_volume

6

pub_type

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