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Given the neural excitation,

Mathinline
bodyu(t)
, shown below, derive an expression for and plot the muscle activation,
Mathinline
bodya(t)
, as a function of time. Label any critical points

in your graph. Assume that the time constant for activation is 0.12 seconds and the time constant for deactivation is 0.24 seconds.

Feel free to use either the excitation-activation dynamics ODE from your textbook, or the ODE shown below to do your calculations.

Excitation-Activation Dynamics ODE: 

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\frac{da(t)}{dt} +[\frac{1}{\tau_{act}}·(\beta+(1-\beta)u(t))] · a(t) = \frac{u(t)}{\tau_{act}}


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S4.1 Excitation-activation dynamics
S4.1 Excitation-activation dynamics