Abstract
We present a simple stochastic mechanism which generates pulse trains exhibiting a power-law distribution of the pulse intervals and a power spectrum over several decades at low frequencies with α close to 1. The essential ingredient of our model is a fluctuating threshold which performs a Brownian motion. Whenever an increasing potential hits the threshold, is reset to the origin and a pulse is emitted. We show that if increases linearly in time, the pulse intervals can be approximated by a random walk with multiplicative noise. Our model agrees with recent experiments in neurobiology and explains the high interpulse interval variability and the occurrence of noise observed in cortical neurons and earthquake data.
- Received 6 December 2000
DOI:https://doi.org/10.1103/PhysRevE.65.026120
©2002 American Physical Society