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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...
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...
Motor Unit Stimulation01:20

Motor Unit Stimulation

When the neuron of a motor unit fires an action potential, it triggers a series of events, leading to a twitch contraction in the muscle fibers. The process of excitation-contraction coupling is crucial in relaying the action potential to the muscle fibers.
The latent period of contraction marks the onset of excitation-contraction coupling, when the action potential propagates across the sarcolemma, preparing the muscle fibers for contraction. As the fibers enter the contraction phase, the...
Excitatory and Inhibitory Effects of Neurotransmitters01:29

Excitatory and Inhibitory Effects of Neurotransmitters

When an action potential reaches the presynaptic axon terminal, it releases neurotransmitters from the neuron into the synaptic cleft at a chemical synapse. The released neurotransmitter can be excitatory or inhibitory. The critical criteria commonly used to determine whether a molecule is a neurotransmitter at a chemical synapse are the molecule's presence in the presynaptic neuron. Second, its release is in response to strong presynaptic depolarization. And lastly, the presence of specific...
Electrical Synapses01:28

Electrical Synapses

Electrical synapses found in all nervous systems play important and unique roles. In these synapses, the presynaptic and postsynaptic membranes are very close together (3.5 nm) and are actually physically connected by channel proteins forming gap junctions.
Gap junctions allow the current to pass directly from one cell to the next. In contrast, in the chemical synapse, the neurotransmitters carry the information through the synaptic cleft from one neuron to the next. They consist of two...

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Related Experiment Video

Updated: Jun 6, 2026

Time-dependent Increase in the Network Response to the Stimulation of Neuronal Cell Cultures on Micro-electrode Arrays
10:45

Time-dependent Increase in the Network Response to the Stimulation of Neuronal Cell Cultures on Micro-electrode Arrays

Published on: May 29, 2017

Low-intensity electrical stimulation affects network dynamics by modulating population rate and spike timing.

Davide Reato1, Asif Rahman, Marom Bikson

  • 1Department of Biomedical Engineering, The City College of the City University of New York, New York 10031, USA. davide.reato@gmail.com

The Journal of Neuroscience : the Official Journal of the Society for Neuroscience
|November 12, 2010
PubMed
Summary

Weak electrical fields subtly alter brain activity by modulating neuronal firing rates and timing. This research reveals how these weak fields influence neural oscillations, offering insights into noninvasive brain stimulation techniques.

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Time-dependent Increase in the Network Response to the Stimulation of Neuronal Cell Cultures on Micro-electrode Arrays
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Area of Science:

  • Neuroscience
  • Computational Neuroscience
  • Biophysics

Background:

  • Transcranial electrical stimulation (TES) shows remarkable clinical effects despite low electric field amplitudes.
  • Understanding how weak currents influence brain activity is crucial for developing effective noninvasive electrotherapies and assessing the role of endogenous fields.

Purpose of the Study:

  • To investigate the mechanisms by which weak electrical fields modulate neuronal population activity.
  • To elucidate how dynamic network activity can amplify the effects of small electrical fields on the brain.
  • To explore the functional significance of endogenous electric fields in neural processing.

Main Methods:

  • Slice electrophysiology experiments on rat hippocampal slices.
  • Computational modeling of spiking neuron networks subjected to weak electric fields.
  • Intracellular recordings to validate model predictions.

Main Results:

  • Weak, low-frequency electrical fields (<50 Hz, <10 V/m) induced nonlinear responses in gamma oscillations (25-35 Hz), including asymmetric and symmetric power modulation and half-harmonic oscillations.
  • Model predictions of neuronal timing and rate changes were confirmed by intracellular recordings.
  • Spike phase-entrainment resonance was observed at 0.2 V/m.

Conclusions:

  • Weak electrical fields can induce coherent changes in neuronal firing rates and timing, which are magnified by network dynamics.
  • A mechanistic framework was established for how weak fields interact with neuronal networks, providing a functional role for endogenous electric fields.
  • Modulation of gamma oscillations, including during theta-modulated gamma activity, can occur solely due to endogenous field effects.