Sattigeri Raghottam M
Department of Physics, Faculty of Science, The Maharaja Sayajirao University of Baroda, Vadodara, India.
Front Comput Neurosci. 2020 Mar 18;14:21. doi: 10.3389/fncom.2020.00021. eCollection 2020.
Hodgkin-Huxley (HH) model has been one of the most successful electrical interpretation of nerve membrane which led to revolutions in the field of computational neuroscience. On the contrary, experimental observations indicate that, an Action Potential (AP) is accompanied with certain physiological changes in the nerve membrane such as, production and absorption of heat; variation of axon diameter, pressure and length. Although, in the early 1900's a Pressure Wave Theory was proposed by E. Wilke, but, due to lack of sophisticated experimental techniques it was left uncharted. Until recently, when Heimburg-Jackson, Hady-Machta and Rvachev, independently proposed Soliton Theory (thermodynamic interpretation of nerve membrane), Mechanical Surface Waves theory (electro-mechanical interpretation) and Rvachev Model (mechano-electrical activation of voltage gated sodium ion channels) respectively; encouraging a deviation from the traditional HH interpretation with justification for the physical changes in the nerve membrane observed experimentally. But, these theories lead to a "" scenario because, they do explain certain features (increase/decrease in axon diameter) but miss to explain, between the strength of stimuli and spike rate of AP. Bio-physical models of nerve membrane are thus important for enhancing our understanding regarding the governing dynamics of neural activities encompassing the experimental observations. A novel theory is proposed here which, unravels formation due to ion currents in the intracellular and extracellular region leading to variation of pressure causing the increment/decrement in axon diameter. These formations manifest as which are used to establish a between the strength of stimuli and spike rate of AP. The theory proposed in this paper, brings a paradigm shift in our understanding of neural dynamics from a thorough bio-physical and physiological perspective with promising applications.
霍奇金-赫胥黎(HH)模型一直是对神经膜最成功的电学解释之一,它引发了计算神经科学领域的变革。相反,实验观察表明,动作电位(AP)伴随着神经膜的某些生理变化,例如热的产生和吸收;轴突直径、压力和长度的变化。尽管在20世纪初,E. 威尔克提出了压力波理论,但由于缺乏精密的实验技术,该理论未得到进一步研究。直到最近,海姆堡-杰克逊、哈迪-马奇塔和尔瓦切夫分别独立提出了孤子理论(神经膜的热力学解释)、机械表面波理论(机电解释)和尔瓦切夫模型(电压门控钠离子通道的机电激活);鼓励偏离传统的HH解释,为实验观察到的神经膜物理变化提供了依据。但是,这些理论导致了一种“”情况,因为它们确实解释了某些特征(轴突直径的增加/减少),但未能解释刺激强度与动作电位的发放率之间的关系。因此,神经膜的生物物理模型对于增强我们对包含实验观察结果的神经活动控制动力学的理解非常重要。这里提出了一种新理论,该理论揭示了由于细胞内和细胞外区域的离子电流导致压力变化,从而引起轴突直径增加/减少的形成过程。这些形成表现为,用于建立刺激强度与动作电位发放率之间的关系。本文提出的理论从全面的生物物理和生理学角度,为我们对神经动力学的理解带来了范式转变,并具有广阔的应用前景。