Fig. 10.

Characterization of individual spiking behaviors in the presence of interpopulation (both I to E and E to I) STDPs. ISI histograms for various values of D in the I-population (a1–a6) and the E-population (b1–b6). Vertical dotted lines in a1–a6 and b1–b6 represent multiples of the global period $T_G^{(X)}$ of the instantaneous population spike rate $R_X(t)$ ($X=I$ or E). Plots of the coefficient of variation $C{V}_X$ (open circles) versus D; $X=$cI and dE. For comparison, the coefficients of variation in the absence of STDP are represented by solid circles