Figure 2
From: Calcium-dependent subthreshold fluctuations in membrane voltage; a modeling study
Power spectral density for stochastic I AHP current Black trace is simulation under default settings. Red trace shows the effects of clamping intracellular calcium, which reduces low-frequency power. Green trace shows the IAHP current when inherent thermal fluctuations are removed by switching channel dynamics from Markov to HH. The crossover of these two signals suggests that intracellular calcium fluctuations can contribute to low-frequency voltage noise.