12.07.2015 Views

Dynamical Systems in Neuroscience:

Dynamical Systems in Neuroscience:

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Simple Models 337800resetI=600 pA4000I=500 pAI=500 pA20 mV25 msreset+10 mV8004000spik<strong>in</strong>g limit cycleI=470 pAI=400 pAI=200 pAoscillationsrest-50 mVrecovery variable, u8004000restu-nullcl<strong>in</strong>ev-nullcl<strong>in</strong>espikeI=400 pA-60 -40 -20 0membrane potential, v (mV)Figure 8.38: Comparison of <strong>in</strong> vitro record<strong>in</strong>gs of rat’s bra<strong>in</strong>stem mes V neuron (fromFig. 7.3) with simulations of the simple model 25 ˙v = (v + 50)(v + 30) − u + I, ˙u =0.5{U(v + 50) − u}, with cubic slow nullcl<strong>in</strong>e U(x) = 25x + 0.009x 3 . If v ≥ 10, thenv ← −40.

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