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. 2015 Apr 22;5:9895. doi: 10.1038/srep09895

Figure 5. Percentage of inhibitory synapses observed in mammalian brains optimizes the combination of excitability and variability in the response.

Figure 5

The average synaptic strength and the entropy (left scale) evaluated for 500 configurations of networks with N = 1000 neurons learning the AND and XOR rules are shown as function of pin (kd = 3, α = 0.001). The functional F = EpinS (right scale) has a maximum for pin = 30%.