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Related Concept Videos

Propagation of Action Potentials01:23

Propagation of Action Potentials

The propagation of an action potential refers to the process by which a nerve impulse, or "action potential," travels along a neuron.
Neurons (nerve cells) have a resting membrane potential, with a slightly negative charge inside compared to outside. This is maintained by ion channels, such as sodium (Na+) and potassium (K+) channels, which control the flow of ions. When a stimulus, like a touch or a signal from another neuron, triggers the neuron, sodium channels open, allowing sodium ions to...
The Role of Ion Channels in Neuronal Computation01:19

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A postsynaptic neuron usually receives numerous impulses from several other presynaptic neurons. The axon hillock of the postsynaptic neuron integrates all these signals and determines the likelihood of firing an action potential.
Sometimes a single EPSP is strong enough to induce an action potential in the postsynaptic neuron. However, multiple presynaptic inputs must often create EPSPs around the same time for the postsynaptic neuron to be sufficiently depolarized to fire an action potential.
Regulation of Sodium and Potassium01:26

Regulation of Sodium and Potassium

The regulation of sodium and potassium ion concentrations in the human body is a complex process governed primarily by hormones such as aldosterone, antidiuretic hormone (ADH), and atrial natriuretic peptide (ANP).
Sodium Regulation
Sodium ions make up approximately 90% of extracellular cations, with a normal blood plasma concentration of 136–148 mEq/L. A decrease in blood volume and pressure triggers the release of renin from granular cells in the juxtaglomerular complex (JGC), primarily in...
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Neural circuits and neuronal pools are two of the main structures found in the nervous system. Neural circuits are networks of neurons that work together to carry out a specific task or process. They consist of interconnected neurons and glial cells, which provide structural and metabolic support.
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Digestion begins with a cephalic phase that prepares the digestive system to receive food. When our brain processes visual or olfactory information about food, it triggers impulses in the cranial nerves innervating the salivary glands and stomach to prepare for food.
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Neuronal Communication

Neurons, the fundamental units of the brain and nervous system, communicate through complex electrochemical signals that underpin all cognitive and bodily functions. This communication is primarily facilitated by a process involving the generation and propagation of an action potential along the axon of the neuron. When the internal electrical charge of a neuron surpasses a certain threshold, an action potential is triggered. This rapid change in voltage travels swiftly along the axon to the...

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Real-time Electrophysiology: Using Closed-loop Protocols to Probe Neuronal Dynamics and Beyond
08:08

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Noise controlled synchronization in potassium coupled neural models.

Dmitry E Postnov1, Ludmila S Ryazanova, Roman A Zhirin

  • 1Physics Department, Saratov State University, Astrakhanskaya Street 83, Saratov, 410026, Russia.

International Journal of Neural Systems
|June 15, 2007
PubMed
Summary

Noise impacts neuron firing patterns through extracellular potassium. This study reveals how potassium-induced depolarization creates firing patterns, influencing neuronal ensemble synchronization and timing.

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Area of Science:

  • Computational Neuroscience
  • Biophysics

Background:

  • Neuronal ensembles communicate through complex firing patterns.
  • Extracellular ion concentrations, particularly potassium, play a critical role in neuronal excitability and network dynamics.

Purpose of the Study:

  • To investigate the influence of noise input on neuronal firing patterns.
  • To explore the role of extracellular potassium concentration in mediating these noise-induced effects.
  • To understand the formation of firing patterns like delayed firing and synchronization.

Main Methods:

  • Application of biologically plausible computational models.
  • Simulation of small ensembles of neurons coupled via extracellular potassium.
  • Systematic variation of noise intensity and extracellular space volume as control parameters.

Main Results:

  • Demonstration that potassium-induced depolarization underlies noise-induced firing patterns.
  • Identification of delayed firing and synchronization as key emergent phenomena.
  • Observation of new time scales in interspike interval distributions.

Conclusions:

  • Extracellular potassium dynamics are crucial for generating noise-induced firing patterns in neuronal ensembles.
  • The observed phenomena may be significant for understanding spatio-temporal oscillations in neural networks.
  • This work provides insights into the mechanisms governing neural synchrony and information processing.