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. 2013 Sep 24;16(Suppl 2):S159–S168. doi: 10.1093/ntr/ntt149

Figure 2.

Figure 2.

Response of an output variable, y(t), to an input variable, u(t), which changes in value at time 0. The change in the input variable results in changes in the output variable. The characteristics of the output variable’s response to the change in the input variable, such as the magnitude of the output variable change and how quickly this occurs, is defined by Equation 1, a first-order (simple) ODE, and the values of gain K and time constant τ.