Stochastic Resonance in Neural Systems
Noise-Enhanced Signal Detection · FitzHugh-Nagumo Neuron · SNR Peak
Signal Parameters
Signal amplitude A:
0.3
Signal frequency f (Hz):
2
Noise σ:
0.40
Neuron
Threshold θ:
0.80
Neurons (ensemble):
10
Pause
SNR Sweep
SNR = —
Stochastic resonance: optimal noise σ* maximizes SNR.
FitzHugh-Nagumo integrate-and-fire threshold crossing.
Counter-intuitive: adding noise HELPS detect weak signals.
Found in: mechanoreceptors, visual cortex, paddle fish.
SNR ∝ A²/σ² · exp(−(θ−A)²/2σ²)