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Mitchell-Schaeffer

Mitchell-Schaeffer two-variable model (also in a slightly different but equivalent form by Karma)
$\displaystyle {dv\over dt}$ $\textstyle =$ $\displaystyle {1\over \tau_{in}}hv^2(1-v) -{v\over \tau_{out}},$ (21)
$\displaystyle {dh\over dt}$ $\textstyle =$ $\displaystyle \left\{\begin{array}{cc}{1\over \tau_{open}}(1-h)&v<v_{gate}\\ -{h\over \tau_{close}}&v>v_{gate} \end{array}\right.$ (22)