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Related Concept Videos

Muscle Stimulation Frequency01:22

Muscle Stimulation Frequency

The contraction strength of muscles is regulated by motor neurons, which modulate the frequency of action potentials dispatched to the motor units based on the body's requirements. This process of varying the muscle stimulation frequency allows muscles to contract with a force that is precisely tailored to the needs of the moment, whether lifting a feather or a heavy box.
Wave summation
At low firing rates, motor neurons induce individual twitch contractions in muscle fibers. These twitches...
Local Anesthetics: Mechanism of Action01:23

Local Anesthetics: Mechanism of Action

Local anesthetics (LAs) block sensory and motor impulses by inhibiting the sodium channels on the nerve cell membranes. This induces temporary loss of sensation, relieving pain in a specific body area.
Local anesthetics are amphiphilic molecules consisting of a hydrophobic aromatic part linked to a hydrophilic group by an ester or amide linkage. They are weak bases and are usually available as salts, which increases their solubility and stability. Once administered, LAs exist in the body either...
Action Potential: Phases of Stimulation01:28

Action Potential: Phases of Stimulation

The action potential is a complex electrical event that occurs in excitable cells, such as neurons and muscle cells. It consists of several distinct phases, each with specific characteristics.
Resting Phase:
In this phase, the cell's membrane is at its resting potential, typically around -70 millivolts (mV) for neurons. Inside the cell, there is a higher concentration of potassium ions (K+) and a lower concentration of sodium ions (Na+). Voltage-gated sodium channels are closed, and...
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...
Action Potential01:14

Action Potential

Neurons communicate by firing action potentials—the electrochemical signal that is propagated along the axon. The signal results in the release of neurotransmitters at axon terminals, thereby transmitting information to the nervous system. An action potential is a specific "all-or-none" change in membrane potential that results in a rapid spike in voltage.
Membrane potential in neurons
Neurons typically have a resting membrane potential of about -70 millivolts (mV). When they receive...
Action Potential01:14

Action Potential

Neurons communicate by firing action potentials—the electrochemical signal that is propagated along the axon. The signal results in the release of neurotransmitters at axon terminals, thereby transmitting information to the nervous system. An action potential is a specific "all-or-none" change in membrane potential that results in a rapid spike in voltage.
Membrane potential in neurons
Neurons typically have a resting membrane potential of about -70 millivolts (mV). When they receive...

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Related Experiment Video

Updated: Jun 21, 2026

Use of In Vivo Single-fiber Recording and Intact Dorsal Root Ganglion with Attached Sciatic Nerve to Examine the Mechanism of Conduction Failure
09:34

Use of In Vivo Single-fiber Recording and Intact Dorsal Root Ganglion with Attached Sciatic Nerve to Examine the Mechanism of Conduction Failure

Published on: August 27, 2019

High frequency stimulation can block axonal conduction.

Alicia L Jensen1, Dominique M Durand

  • 1Neural Engineering Center, Department of Biomedical Engineering, Case Western Reserve University, Cleveland, OH 44106, USA.

Experimental Neurology
|August 8, 2009
PubMed
Summary
This summary is machine-generated.

High frequency stimulation (HFS) drives axons at low frequencies but fails at higher frequencies, causing conduction block. This impacts understanding HFS for neurological disorders like epilepsy and Parkinson's disease.

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Area of Science:

  • Neuroscience
  • Biophysics
  • Computational Neuroscience

Background:

  • High frequency stimulation (HFS) is a therapeutic technique for neurological disorders, but its precise mechanisms remain unclear.
  • Existing research suggests HFS may suppress neuronal cell bodies but potentially excite axons.
  • The effect of HFS on surrounding tissues and axonal behavior requires further investigation.

Purpose of the Study:

  • To test the hypothesis that axons, unlike cell bodies, are driven by pulse train HFS.
  • To investigate the frequency-dependent effects of HFS on axonal activity in the hippocampus.
  • To elucidate the mechanisms by which HFS influences axonal conduction and its therapeutic implications.

Main Methods:

  • In-vivo and in-vitro electrophysiological recordings in hippocampal fibers.
  • Development of a novel in-vitro preparation isolating the alveus (fiber tract).
  • Computational modeling to interpret electrophysiological data on axonal response to HFS.

Main Results:

  • Axons were driven by low-frequency HFS (0.5-25 Hz) but failed to follow higher frequencies.
  • Fiber tracts showed limited tracking capacity: <50 Hz in-vitro and <125 Hz in-vivo.
  • High-amplitude HFS (>150 Hz) induced reversible conduction block, disrupting both evoked and secondary activity.

Conclusions:

  • HFS affects axonal activity by disrupting excitation and causing partial conduction block.
  • Increased HFS amplitude leads to complete conduction block of secondary evoked activity.
  • Findings offer critical insights into HFS efficacy for treating epilepsy, Parkinson's disease, and other movement disorders.