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. Author manuscript; available in PMC: 2010 Jan 31.
Published in final edited form as: Neural Comput. 2008 Oct;20(10):2379. doi: 10.1162/neco.2008.12-06-416

Figure 5. Response to tonic input.

Figure 5

(A) For non-zero external input that is constant in time (inset) the current in the system ( I ) may increase as a function of time (see B for the condition of this). In this case the number of active neurons (full circles) is given by (9). The inactive units are shown by empty circles.

(B) For stationary external input the system's response increases with time if the value of input exceeds a threshold equal to Δ̄. The rate of increase (İ ≡ dI / dt) is proportional to the external current above threshold.