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<p>We introduce a thermosensitive FitzHugh-Nagumo neuron model extended with a third dynamic variable representing an external electric field. This unified framework enables a biophysically grounded analysis of how combined thermal and electrical stimuli modulate neuronal excitability. The model incorporates temperature dependence, ion charge density, cell radius, and voltage-driven stimulation, capturing their joint effects on membrane polarization and firing dynamics. Using bifurcation analysis, Lyapunov exponents, and interspike interval variability, we identify transitions between spiking, bursting, and chaotic regimes. We further show how periodic electric fields tune these dynamics as a function of stimulus amplitude, frequency, and cellular geometry. Our results provide mechanistic insights into neuronal excitability and suggest avenues for controlling neural activity via hybrid thermal-electrical modulation, with potential applications in neuromodulation therapies and bioelectronics.</p>

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Modulation of neuronal firing modes by electric fields in a thermosensitive FitzHugh-Nagumo model

  • 期刊论文

  • 发表日期：

    2025年12月5日

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  • Ediline L. Fouelifack Nguessap,
  • Antonio C. Roque,
  • Fernando F. Ferreira

摘要

We introduce a thermosensitive FitzHugh-Nagumo neuron model extended with a third dynamic variable representing an external electric field. This unified framework enables a biophysically grounded analysis of how combined thermal and electrical stimuli modulate neuronal excitability. The model incorporates temperature dependence, ion charge density, cell radius, and voltage-driven stimulation, capturing their joint effects on membrane polarization and firing dynamics. Using bifurcation analysis, Lyapunov exponents, and interspike interval variability, we identify transitions between spiking, bursting, and chaotic regimes. We further show how periodic electric fields tune these dynamics as a function of stimulus amplitude, frequency, and cellular geometry. Our results provide mechanistic insights into neuronal excitability and suggest avenues for controlling neural activity via hybrid thermal-electrical modulation, with potential applications in neuromodulation therapies and bioelectronics.