Neural adaptation and fractional dynamics as a window to underlying neural excitability
Fig 2
Neuronal spike frequency adaptation (a) approximates fractional differentiation with order ~0.1–0.5. Properties for the fractional derivative transfer function (i2π)α include a power law amplitude response and frequency-independent phase response (see also S1 Text). (b) Higher fractional orders correspond to increased spike frequency adaptation, i.e., increased negative feedback inhibition.