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Dynamical Systems in Neuroscience:

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Bifurcations 185unstable limit cyclesnVI=49stableunstableII=48.75max/m<strong>in</strong> of oscillations ofmembrane potential, mV0-20-40-60-80u nstablestablelimit cyclesunstable45 50 55<strong>in</strong>jected current, II=48I=47I=45subcritical Andronov-Hopfbifurcation at I=48.8I=43Ceigenvalues c + iω10.80.6V-nullcl<strong>in</strong>eimag<strong>in</strong>ary part, ω00.4stable unstable0real part, c0.20n-nullcl<strong>in</strong>e-80 -60 -40 -20 0 20membrane voltage, V (mV)Figure 6.16: Subcritical Andronov-Hopf bifurcation <strong>in</strong> the I Na,p +I K -model: As thebifurcation parameter I <strong>in</strong>creases, an unstable limit cycle (dashed circle; see alsoFig. 6.14) shr<strong>in</strong>ks to an equilibrium and makes it lose stability. Parameters as <strong>in</strong>Fig. 4.1b except g L = 1, g Na = g K = 4, and the Na + activation function has V 1/2 = −30mV and k = 7.

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