Experimental evidence of a chaotic region in a neural pacemaker |
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Authors: | Hua-Guang Gu Bing Jia Guan-Rong Chen |
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Institution: | 1. School of Aerospace Engineering and Applied Mechanics, Tongji University, Shanghai 200092, China;2. Department of Electronic Engineering, City University of Hong Kong, Hong Kong SAR, China |
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Abstract: | In this Letter, we report the finding of period-adding scenarios with chaos in firing patterns, observed in biological experiments on a neural pacemaker, with fixed extra-cellular potassium concentration at different levels and taken extra-cellular calcium concentration as the bifurcation parameter. The experimental bifurcations in the two-dimensional parameter space demonstrate the existence of a chaotic region interwoven with the periodic region thereby forming a period-adding sequence with chaos. The behavior of the pacemaker in this region is qualitatively similar to that of the Hindmarsh–Rose neuron model in a well-known comb-shaped chaotic region in two-dimensional parameter spaces. |
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Keywords: | Chaos Bifurcation Neural firing pattern Hindmarsh&ndash Rose model |
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