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Topological Reorganization of Odor Representations in the Olfactory Bulb

Figure 6

Focality of Activity Patterns and Local Sparsening

(A) Mean focality (± SD) of MC and IN activity patterns as a function of time (datasets 1 and 2). Dots indicate significant differences (p < 0.05) from the focality of randomized patterns.

(B) Assignment of MCs to the focus illustrated by three-dimensional activity pattern 256 ms after response onset (Lys, same as in Figure 4A; same conventions). Black cross depicts location of centroid. MCs within 50 μm from the centroid are classified as within the focus (blue); the remaining MCs are classified as outside the focus (cyan). Distance between ticks is 50 μm. Orientation is as indicated: anterior to posterior (A–P), medial to lateral (M–L), and dorsal to ventral (D–V).

(C) Population sparseness of MC activity within foci (blue) and outside foci (cyan) as a function of time, averaged over all odors and OBs (± SD; dataset 1).

(D) Mean TDCa signal (representing firing-rate change; arbitrary units) of MC activity within foci (blue) and outside foci (cyan) as a function of time, averaged over all odors and OBs (± SD; dataset 1).

Figure 6

doi: https://doi.org/10.1371/journal.pbio.0050178.g006