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action potentials
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Thinking about the action potential: the nerve signal as a window to ... frontiersin.org 27 facts
claimThe 'all-or-none' property of action potentials is thought to ensure the high-fidelity transport of encoded information from the receiving end to the transmitting end of neurons.
claimThe annihilation phenomenon of colliding action potentials was first studied and reported by Tasaki in 1949.
claimAction potentials are defined as self-propagating, regenerative waves of electrical activity that travel along the surface of neurons.
claimIncorporating higher-order terms into the HJ soliton model allows for the mathematical and experimental demonstration of the annihilation of colliding action potentials.
claimNeuronal excitability is defined as the ability of neurons to generate and propagate action potentials, which is considered the principal physical characteristic of these cells.
claimThe specific characteristics of action potentials, including shape, duration, velocity, and conduction accuracy, are thought to determine the timing, synchrony, and efficacy of intra- and inter-neuronal communication.
accountIchii Tasaki and a group of neuroscientists investigated the connection between the physico-chemical state of the axolemma-ectoplasm complex and the generation and propagation of action potentials using various axonal preparations and biophysical measurement techniques.
claimCurrent explanatory frameworks for neuronal excitability, including the Hodgkin-Huxley model and its competitors, primarily focus on the physico-chemical characteristics of the axonal membrane as a decoupled interface to explain the electrical and non-electrical manifestations of propagating action potentials.
referenceThe electricity-centered framework for modeling action potentials uses a reductionistic/mechanistic approach, focuses on electric phenomenology (ionic current flow), emphasizes functional transformations in microscopic cellular entities like ion channels, treats non-electrical phenomena as epiphenomena, and views propagation as an irreversible, energy-consuming process.
claimFabiunke et al. (2020) conducted optical studies to examine the state of the neuronal membrane during the propagation of action potentials.
claimEl Hady and Mehta (2015) observed that mechanical surface waves accompany the propagation of action potentials in neurons.
claimThe work of Adrian (1932) and contemporary neurophysiologists is recognized as instrumental in developing modern theoretical and experimental approaches to understanding the role of action potentials in neuronal physiology and function.
referenceMussel and Schneider (2019) published 'Similarities between action potentials and acoustic pulses in a van der Waals fluid' in Scientific Reports, drawing parallels between biological action potentials and physical acoustic pulses.
claimAdrian (1932) introduced the concept of neurons as digital information processors, where action potentials serve as the mechanism for integrating incoming information and communicating it along axons to axon terminals.
claimThe HJ soliton theory of action potentials remains a subject of scientific contention, with critics questioning its validity and the thermodynamic foundations upon which it is built.
claimThe Hodgkin-Huxley model is useful for predicting state variables that control the induction and time-course of action potentials, including threshold and refractory periods.
referenceMeissner (2018) proposed a test for the soliton wave model of action potentials and inducible lipid pores, while also discussing how non-electrical phenomena might be consistent with the Hodgkin-Huxley model.
referenceGonzalez-Perez, A., Budvytyte, R., Mosgaard, L. D., Nissen, S., and Heimburg, T. (2014) studied the penetration of action potentials during collision in the median and lateral giant axons of invertebrates in 'Penetration of action potentials during collision in the median and lateral giant axons of invertebrates' (Phys. Rev. X).
claimAfter initiation, action potentials propagate forward along the axonal shaft toward the synapse.
claimThe 'soliton model' of action potentials, proposed by Heimburg and Jackson in 2005, posits that the nerve signal is an electro-mechanical wave phenomenon.
referenceFillafer, C., Paeger, A., and Schneider, M. F. (2017) reported in 'Collision of two action potentials in a single excitable cell' (Biochim. Biophys. Acta) that two action potentials can collide within a single excitable cell.
referenceKaufmann (1989) authored 'Action potentials and electrochemical coupling in the macroscopic chiral phospholipid membrane,' which discusses action potentials in the context of phospholipid membranes.
perspectiveThe authors argue that the 'classical' electricity-centered conception of neuronal excitability contains a 'blind spot' that, if addressed, could provide new insights into the physical nature of nerve signals and the role of action potentials.
referenceThe thermodynamics-centered framework for modeling action potentials uses a holistic/non-mechanistic approach, focuses on macroscopic thermodynamics (state variables), emphasizes structural transformations (phase transitions) in collective properties of polymeric cellular entities (lipid cell membrane, cytoskeletal elements), treats electrical and non-electrical phenomena as consequences of a single physical process, and views propagation as a largely reversible, energy-conserving process.
claimThe HJ soliton theory has faced criticism from mainstream neuroscience for its inability to explain the annihilation phenomenon, where two action potentials running along the same nerve fiber from opposite directions collide and annihilate each other.
claimEdgar Adrian was responsible for establishing the concept of 'information' in relation to neuronal excitability by using terms such as 'messages,' 'signals,' and 'codes' to describe the functional capacity of action potentials.
claimThe Hodgkin-Huxley (HH) model predicts the annihilation of colliding action potentials as a consequence of the inactivation of sodium (Na+) channels during the refractory period.
Neuroanatomy, Neuron Action Potential - StatPearls - NCBI Bookshelf ncbi.nlm.nih.gov 5 facts
claimDemyelinating diseases reduce the conduction velocity of action potentials by destroying myelin, which is essential for saltatory conduction.
claimNeuronal action potentials are generated and propagated by changes to the cationic gradient, primarily involving sodium and potassium, across the plasma membrane.
claimNeuronal action potentials reach the axonal terminal and cause depolarization of neighboring cells through synapses, facilitating synaptic transmission.
claimVoltage-gated cationic channels are the primary channels used in the generation and propagation of neuronal action potentials.
claimNeurons are electrically excitable cells that react to input by producing electrical impulses, which are propagated as action potentials throughout the cell and its axon.
Branching morphology determines signal propagation dynamics in ... nature.com Aug 21, 2017 5 facts
claimRamon et al. demonstrated that action potentials are modified at sites where the axonal diameter increases abruptly.
referenceStockbridge, N. modeled the theoretical response to trains of action potentials of a bifurcating axon with one short daughter branch in a 1988 study published in the Biophysical Journal.
claimFor a geometric ratio (GR) of 1, there is a perfect impedance match, allowing action potentials to smoothly cross branching points.
claimWhen the geometric ratio (GR) of an axon is less than 1, action potentials cross branching points with slight changes in shape and velocity; when the geometric ratio is greater than 1, action potentials cross with a delay that scales exponentially with the ratio.
claimThe authors of the paper 'Branching morphology determines signal propagation dynamics in...' previously demonstrated that firing patterns, consisting of a tunable number of action potentials and failures, are generated by stimulus current and axonal segment geometry.
Bioelectricity | Cell Signaling, Nerve Impulses & Muscle Contractions britannica.com Mar 10, 2026 3 facts
claimMuscle cells utilize electric pulses similar to action potentials to accompany muscular contraction.
claimThe transport of sodium ions is involved in the production of action potentials within cells.
claimNerve cells carry information via electric pulses known as action potentials that travel along nerve fibers.
Action potential: Definition, Steps, Phases | Kenhub kenhub.com 2 facts
Editorial: Recent Advances in Electroreception and Electrogeneration frontiersin.org 1 fact
claimBursts, defined as packets of action potentials followed by quiescence, reliably encode electro-communication stimuli that occur during agonistic encounters in electric fish, as shown by Marsat et al. (2009).
Complexity and the Evolution of Consciousness | Biological Theory link.springer.com Sep 14, 2022 1 fact
claimThomas Brunet and Detlev Arendt described the early evolution of neural and contractile modules in stem eukaryotes, linking damage response to action potentials.
Global Workspace vs. Integrated Information: Testing… templetonworldcharity.org 1 fact
claimBrain cells generate electrical pulses known as action potentials, and the patterns of these pulses across many neurons encode conscious experience at any given time.
Action potentials and synapses - Queensland Brain Institute qbi.uq.edu.au 1 fact
claimThomas Splettstoesser created the image of action potentials in neurons, which is licensed under CC BY-SA 4.0.
Quantum Theory of Consciousness - Scirp.org. scirp.org 1 fact
measurementMax Tegmark estimates that decoherence time scales for ions involved in the propagation of action potentials are 10 to 20 orders of magnitude smaller than the relevant time scales of neural dynamics.