This paper will treat the bifurcation and numerical simulation of rotating wave (RW) solutions of the FitzHugh-Nagumo (FHN) equations. These equations are often used as a simple mathematical model of excitable media. The dependence of the solutions on a uniformly applied current, and also on the diffusion coefficients or domain size will be studied. Ranges of applied current and/or diffusion co...

Article history: Received 21 September 2011 Received in revised form 20 December 2011 Accepted 5 January 2012 Available online 11 January 2012 Communicated by A.R. Bishop We investigate the feedback control of a periodically driven FitzHugh–Nagumo circuit (FHN), which displays both spiking and non-spiking behaviors in chaotic or periodic regimes. The simple high pass filter (washout filter) is ...

Fractal behavior has been observed in both ion-channel gating and neuronal spiking patterns, but a causal relationship between the two has not yet been established. Here, we examine the effects of fractal ion-channel activity in modifications of two classical neuronal models: Fitzhugh-Nagumo (FHN) and Hodgkin-Huxley (HH). For the modified FHN model, the recovery variable was represented as a po...

Recently, it has been shown experimentally [Mainen & Sejnowski, 1995] that, in contrast to the lack of precision in spike timing associated with flat (dc) stimuli, neocortical neurons of rats respond reliably to weak input fluctuations resembling synaptic activity. This has led authors to suggest that, in spite of the high variability of interspike intervals found in cortical activity, the mech...

It was demonstrated that the chaos-driven FitzHugh–Nagumo (FHN) neuron can be considered as a logic system to implement reliable logical operations through mechanism of resonance. Autapse (meaning self-synapse) widely exists in various kinds neurons, and it significantly affects neuronal dynamics functionalities. However, effects autapse on resonance have not been reported yet. Here, we explore...

We investigate the mechanism of abrupt transition between small and large amplitude oscillationsin fast-slow piecewise-linear (PWL) models of FitzHugh-Nagumo (FHN) type. In the context ofneuroscience, these oscillatory regimes correspond to subthreshold oscillations and action potentials(spikes) respectively. The minimal model that shows such phenomenon has a cubic-like nullclin...

The EEGs of young (21-25-year-old) sons of alcoholics and their matched controls (n = 24 pairs) were computer evaluated to assess activity in the 12-20 Hz (beta) range. Subjects were blindly exposed to ethanol and placebo drinks while EEG was gathered at baseline and 90 min postconsumption. Men with alcoholic fathers [family history positive (FHP)] displayed significantly more beta activity at ...

We evaluated hyperbaric oxygen (HBO) therapy on a cohort of patients with femoral head necrosis (FHN). This double-blind, randomized, controlled, prospective study included 20 patients with unilateral FHN. All were Ficat stage II, treated with either compressed oxygen (HBO) or compressed air (HBA). Each patient received 30 treatments of HBO or HBA for 6 weeks. Range of motion, stabilometry, and...

The synchronization of populations interacting spiking neurons is a topic interest for understanding the operation brain and developing oscillatory-based biomimetic computation. analysis by models such as Hodgkin–Huxley (HH) FitzHugh–Nagumo (FHN) based on electrical electrochemical concepts. application small-signal AC impedance equivalent circuit methods promising tool fabrication artificial s...

این پژوهش با الهام گرفتن از نتایج یک طرح مطالعاتی کاربردی، رویکرد سلسله­‌مراتبی جهت پیگیری فرایند توسعه تأمین‌کنندگان و حمایت تصمیمات موجود در هر مراحل آن ارائه‌ می‌کند. ابتدا، زمینه‌های تأمین نیازمند سپس واجد شرایط هریک زمینه‌ها به کمک تصمیم‌گیری چندشاخصه بهترین-بدترین مشخص می‌گردند. معیارهای شناسایی نیز مرور مطالعات پیشین بهره‌گیری نظرات خبرگان حوزه‌ی خرید استخراج‌شده‌اند. درنهایت، مدل ریاضی ...