Uniform Field Excitation
Uniform Field Excitation - Related Videos
01:22
Electric Field of a Non Uniformly Charged Sphere
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2025
Gauss's law states that the electric flux through any closed surface equals the net charge enclosed within the surface. This law is beneficial for determining the expressions for the electric field for a particular charge distribution if the electric flux is known. Consider a non-uniformly charged sphere, for which the density of charge depends only on the distance from a point in space and not on the direction. Such a sphere has a spherically symmetrical charge distribution. Here, the electric...
01:10
Electric Potential Energy in a Uniform Electric Field
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2026
When an electric field accelerates a free positive charge, it acquires kinetic energy. This process is analogous to an object being accelerated by a gravitational field as if the charge were going down an electrical hill where its electric potential energy is converted into kinetic energy, although, of course, the sources of the forces are very different. The electrostatic or Coulomb force acting on the positive test charge is conservative, which means that the work done on a test charge is...
08:32
External Excitation of Neurons Using Electric and Magnetic Fields in One- and Two-dimensional Cultures
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Cited by 9 •
2017
Neuronal cultures are a good model for studying emerging brain stimulation techniques via their effect on single neurons or a population of neurons. Presented here are different methods for stimulation of patterned neuronal cultures by an electric field produced directly by bath electrodes or induced by a time-varying magnetic field.
01:19
Uniform Distribution
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2025
The uniform distribution is a continuous probability distribution of events with an equal probability of occurrence. This distribution is rectangular.Two essential properties of this distribution are The area under the rectangular shape equals 1. There is a correspondence between the probability of an event and the area under the curve.Further, the mean and standard deviation of the uniform distribution can be calculated when the lower and upper cut-offs, denoted as a and b,...
02:29
External Excitation of One-Dimensional Patterned Neuronal Cultures
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2025
This video demonstrates a technique for stimulating line-patterned neuronal cultures with a uniform, unidirectional electric field.
FAQs
A neuron’s orientation relative to the applied field shapes how its membrane becomes polarized along its length. Consequently, cells exposed to the same field strength may show different excitability changes if their orientations differ. Accounting for this relationship helps researchers distinguish effects caused by field geometry from intrinsic differences among neurons and interpret single-cell responses more accurately.
Field strength and exposure duration jointly influence whether membrane polarization becomes sufficient to activate voltage-gated ion channels. A weaker field or shorter exposure may produce limited effects, whereas stronger or longer application can increase the likelihood of reaching the conditions required for action-potential initiation. These variables therefore provide key controls for relating stimulation parameters to neuronal output.
Membrane polarization produced by the external field can alter the state of voltage-gated ion channels. When the polarization reaches a sufficient level, channel activation can initiate an action potential, converting the physical field perturbation into a measurable electrical event. This mechanism connects the applied field to changes in neuronal excitability and provides a basis for interpreting activity responses.
Experimental design should specify the field’s approximate strength, direction, and exposure duration, while also documenting the orientation of the neural preparation. These factors determine the polarization experienced by individual neurons. Keeping them controlled allows comparisons across conditions and supports clearer attribution of observed changes in activity to the applied field rather than to uncontrolled stimulation differences.
At the single-neuron level, the method links field parameters to changes in excitability and action-potential generation. At the network level, researchers can examine how coordinated neural activity changes when many cells experience the field. Using both scales helps connect cellular polarization with broader patterns of brain activity and clarifies whether responses are local or network-wide.
Uniform Field Excitation supports investigations of electrical neuromodulation and the relationship between externally applied fields and brain activity. It also supplies controlled conditions for computational models of stimulation, allowing modelers to connect physical parameters with predicted neuronal responses. Together, experimental and modeling applications can help evaluate how field strength, direction, duration, and cellular orientation shape outcomes.