Global bifurcation structure of a Bonhoeffer-van der Pol oscillator driven by periodic pulse trains |
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| Authors: | Taishin Nomura Shunsuke Sato Shinji Doi Jose P Segundo Michael D Stiber |
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| Institution: | (1) Department of Biophysical Engineering, Faculty of Engineering Science, Osaka University, Toyonaka, 560 Osaka, Japan;(2) Department of Anatomy and Cell Biology, Brain Research Institute, University of California, 90024-1763 Los Angeles, CA, USA;(3) Computer Science Department, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong |
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| Abstract: | The Bonhoeffer-van der Pol (BVP) oscillator is a valuable dynamical system model of pacemaker neurons. Isochrons, phase transition curves (PTC), and two dimensional bifurcation diagrams served to analyze the neuron's response to periodic pulse stimuli. Responses are described and explained in terms of the nonlinear dynamical system theory. An important issue in the generation of spikes by pacemaker neurons is the existence of both slow and fast dynamics in the state point's trajectory in the phase plane. It is this feature in particular that makes the BVP oscillator a faithful model of living pacemaker neurons. Comparison of the model's responses with those of a living pacemaker was based also on return maps of interspike intervals. Analyzed in detail were the complex discharges called  stammering which involve interspike intervals that arise unpredictably and exhibit histograms with several modes separated by the equal intervals.Supported by Trent H. Wells Jr. Inc. |
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