Neural Mass Model — Alpha Rhythm

Input p (Hz²·mV) 220

Excitation A (mV) 3.25

Inhibition B (mV) 22.0

Inh strength C₂ 135

Peak freq (Hz)—

Amplitude (mV)—

Regime—

Jansen-Rit NMM models mesoscopic neural populations. Three populations: pyramidal (output), excitatory interneurons, inhibitory interneurons. Sigmoid firing function Sigm(v) = 2e₀/(1+exp(r(v₀−v))). Alpha rhythm (8-12 Hz) emerges from thalamocortical loop dynamics. Bifurcations: steady state → limit cycle → chaos.