Neural adaptation and fractional dynamics as a window to underlying neural excitability
Fig 5
Adaptation affects the gain and slope of neural power spectral densities.
(a) Example showing interaction of high-pass filters with low-pass filters. Eq (7) is plotted with three timescales (γ = k = c = x0 = 1, F = 0.5). (b) Relative steady-steady output for synaptic depression initially increases and then decreases as x0 increases (modeled via Eq (8) with n = 3, F = 0.5, γ = 2). (c) Adaptation alters the slope of PSDs, decreases the overall gain, and affects lower frequencies (e.g. 0–10 Hz) more than higher frequencies (e.g. 30–50 Hz). Adaptation interacts with input levels and includes Spike Frequency Adaptation (SFA) and Short-term Synaptic Depression (STD).