Noise and periodic modulations in neural excitable media.
نویسندگان
چکیده
We have analyzed the interplay between noise and periodic modulations in a mean field model of a neural excitable medium. For this purpose, we have considered two types of modulations, namely, variations of the resistance and oscillations of the threshold. In both cases, stochastic resonance is present, irrespective of whether the system is monostable or bistable.
منابع مشابه
Encoding Carrier amplitude Modulations via Stochastic phase Synchronization
The firings of excitable systems can phase lock to periodic forcing. In many situations however, the firings are separated by a random number of forcing cycles, even though they occur near a preferred phase of the forcing. Also, the associated interspike interval histograms display peaks over a continuous range of integer multiples of the forcing period, and the peak heights are a unimodal func...
متن کاملPacemaker-guided noise-induced spatial periodicity in excitable media
We study the impact of subthreshold periodic pacemaker activity and internal noise on the spatial dynamics of excitable media. For this purpose, we examine two systems that both consist of diffusively coupled units. In the first case, the local dynamics of the units is driven by a simple one-dimensional model of excitability with a piece-wise linear potential. In the second case, a more realist...
متن کاملبررسی تحریک جمعی نورون ها تحت اثر نوفه در حالت برانگیخته در شبکه های جهان کوچک و تصادفی
Synchrony is significant in brain neural network. In this study we investigate the collective firing in an excitable media and modeling the brain network by an small-world one. The Gaussian white noise is taken to the system of phase oscillators, and then to the frequency distribution. An order parameter in non stationary situation and other usefull statistical parameters such as firing are co...
متن کاملTraveling Pulses and Wave Propagation Failure in Inhomogeneous Neural Media
We use averaging and homogenization theory to study the propagation of traveling pulses in an inhomogeneous excitable neural network. The network is modeled in terms of a nonlocal integrodifferential equation, in which the integral kernel represents the spatial distribution of synaptic weights. We show how a spatially periodic modulation of homogeneous synaptic connections leads to an effective...
متن کاملNoise-Induced Synchronization and Desynchronization of Neural Oscillators
We study an influence of white Gaussian noise on synchrony of neural oscillators. In neurophysiology, the property of a single neuron to provide identical outputs for repeated noisy input (in terms of our problem, an array of such identical neurons driven by common noise to behave synchronously) is referred as “reliability” [1]. The first quantifier of the synchrony we use is the Lyapunov expon...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
- Physical review. E, Statistical physics, plasmas, fluids, and related interdisciplinary topics
دوره 59 5 Pt B شماره
صفحات -
تاریخ انتشار 1999