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The problem of phase response curves (PRCs) for two neuronal oscillators coupled with chemical synapse is considered in this paper. For small inputs, the PRCs can be computed for a linearized model for the system on the limit cycle. But for an input with large amplitude, the PRCs could be computed by direct method. The shape of phase response curve for single oscillator is depending on the influence...
The article is aimed at studying the relationship between arterial blood pressure (ABP) and cerebral oxygen hemoglobin signals to the change of the posture in healthy elderly subjects using wavelet phase coherence (WPCO) analysis. ABP and HbO2 (NIRS) signals of 35 subjects (young group: 19, Age: 24.9; elderly group: 16, Age: 68.9) were acquired from experimental apparatus with continuous recordings...
Nonlinear interaction between neural oscillations may be a biomarker for closed-loop deep brain stimulation (DBS) in Parkinson's disease. Bispectral analysis is an effective tool to detect quadratic phase coupling. In this paper we applied bispectral analysis to local field potentials (LFPs) recorded from Parkinsonism patients' subthalamic nucleus (STN) during tremor and resting states. The significance...
This study aims to assess the prefrontal functional connectivity using wavelet coherence analysis of cerebral tissue oxyhaemoglobin concentrations (Delta [HbO2]) signals in subjects with cerebral infarction(CI) during the resting state. Continuous recordings of near-infrared spectroscopy (NIRS) signals were gained from the right and left prefrontal lobe in 15 elderly subjects with CI (age: 75.1 ±...
Phase synchrony among cortical brain regions is a key aspect of the working memory process. In this study we utilized phase synchrony analysis of EEG signals to construct brain networks and investigate the rest and working memory states of the brain. The maintenance period of working memory demonstrated higher global and local phase synchronization compared to the rest condition in the theta, alpha...
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