PNs exhibit broader odor responses than their associated ORNs.

<p>[A] Shown are trial-averaged firing-rate curves for various model PNs (magenta, solid) and associated model ORNs (green, dashed) in response to various model odors. Note that, qualitatively similar to experiment <a href="http://www.ploscompbiol.org/article/info:doi/10.1371/journal.pcbi.1002622#pcbi.1002622-Olsen2" target="_blank">[12]</a>, the activity of the model PNs does not necessarily reflect the activity of the associated model ORNs. [B] Shown are the PN-ORN (green) and PN-PN (red) Spearman rank-correlation histograms for the model PNs and associated model ORNs (averaged over all PN and ORN pairs associated with each given glomerulus, and then further averaged over glomeruli — see <a href="http://www.ploscompbiol.org/article/info:doi/10.1371/journal.pcbi.1002622#pcbi.1002622-Bhandawat2" target="_blank">[20]</a> for the statistical methods used). Note that, qualitatively similar to experiment, the mean of the PN-ORN histogram is closer to than the mean of the PN-PN histogram, indicating that, while PNs associated with a given glomerulus tend to respond to the same odors, they do not necessarily respond to the same set of odors which stimulate their associated ORNs.