Dynamical Systems in Neuroscience:

Simple Models 339rat's mitral cell (in vitro)40 mV100 mssimple modelI=35pAI=20 pAup-stateI=15pAI= 10pAsomadendriteFigure 8.40: Comparison of in vitro recordings of mitral neurons of rat’s olfactory bulbwith simulations of the simple two-compartment model. Soma: 40 ˙v = (v+55)(v+50)+0.5(v d −v)−u+I, ˙u = 0.4{(U(v)−u} with U(v) = 0 when v < v b and U(v) = 20(v−v b )when v ≥ v b = −48 mV. If v ≥ 35, then v ← −50. Passive dendrite (dotted curve):˙v d = 0.0125(v − v d ). Weak noise was added to simulations to unmask subthresholdoscillations in the up-state. The membrane potential of the neuron is held at −75mV by injecting a strong negative current, and then stimulated with steps of positivecurrent. (Data were kindly provided by Philip Heyward.)