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Minimal Size of Cell Assemblies Coordinated by Gamma Oscillations

Figure 3

Spike rastergrams illustrating breakdown of strong PING rhythm as E-to-I-synapses are weakened.

Blue dots indicate spike times of I-cells (cells 1–20), and red dots indicate spike times of E-cells (cells 21–100). From left to right: mean excitatory conductance density per I-cell (panels A, D, G), 0.08 (B, E, H), and 0.04 (C, F, I, and J) . The network in panels A, B, and C is homogeneous. In panels D through F, the E-to-I-connection is sparse and random (50% connectivity). In panels G through I, the I-to-E- and I-to-I-connections are sparse and random as well (50% connectivity), and so are external drives: 15% heterogeneity in drives to E-cells, and drives to I-cells vary between and . (See paragraph surrounding Eq. S8 in Text S1 for the precise meaning of “15% heterogeneity”.) The parameters in panel J are those of panel I, but mean external drive density to the I-cells is raised from 0 to 0.4 , and there are no I-to-I-synapses.

doi: https://doi.org/10.1371/journal.pcbi.1002362.g003