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Constructing sigmoidal and Gaussian firing rate functions. Left: Heterogeneity in firing onset for individual cells leads to a sigmoidal population activation function. Middle: Including the effect of heterogeneous thresholds for depolarization block leads to a population activation function with a maximum. Right: The activation functions used in this paper Gaussian (solid) and sigmoid (dashed) for excitatory (blue) and inhibitory (black) populations
