Gamma Oscillations

~40 Hz gamma oscillations emerge from the E-I balance: pyramidal cells (excitatory) drive interneurons (inhibitory), which feed back to create rhythmic inhibition. PING (Pyramidal Interneuron Network Gamma) mechanism.

E Drive (I_ext)2.0

E→I strength1.0

I→E strength1.5

Noise σ0.20

Top: E and I neuron spikes · Middle: membrane potentials · Bottom: LFP power spectrum (gamma peak ~40 Hz)