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Related Concept Videos

Potential Due to a Magnetized Object01:24

Potential Due to a Magnetized Object

Magnetic dipoles in magnetic materials are aligned when placed under an external magnetic field. For paramagnets and ferromagnets, dipole alignment occurs in the direction of the magnetic field. However, the dipoles align opposite to the field in the case of diamagnets. This state of magnetic polarization due to the external field is called magnetization. Magnetization is defined as the dipole moment per unit volume. It plays a similar role to polarization in electrostatics.
The vector...
Induction01:16

Induction

An emf is induced when the magnetic field in a coil is changed by pushing a bar magnet into or out of the coil. emfs of opposite signs are produced by motion in opposite directions, and the directions of emfs are also reversed by reversing poles. The same results are produced if the coil is moved rather than the magnet—it is the relative motion that is important. The faster the motion, the greater the emf. Additionally, there is no emf when the magnet is stationary relative to the coil.
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Related Experiment Video

Updated: Jul 9, 2026

Detecting Pre-Stimulus Source-Level Effects on Object Perception with Magnetoencephalography
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Published on: July 26, 2019

Magnetosensory evoked potentials: consistent nonlinear phenomena.

Simona Carrubba1, Clifton Frilot, Andrew L Chesson

  • 1Department of Orthopaedic Surgery, LSU Health Sciences Center, Shreveport, LA 71130-3932, USA.

Neuroscience Research
|November 27, 2007
PubMed
Summary
This summary is machine-generated.

Environmental electromagnetic fields (EMFs) can alter brain activity, but effects are inconsistent. Nonlinear analysis, specifically recurrence quantification analysis (RQA), reliably detected magnetosensory evoked potentials (MEPs) in subjects exposed to EMFs, unlike traditional linear methods.

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Area of Science:

  • Neuroscience
  • Biophysics
  • Signal Processing

Background:

  • Environmental electromagnetic fields (EMFs) are known to potentially alter brain activity.
  • Previous studies reported inconsistent findings, possibly due to analytical methods used.
  • Linear analysis techniques may fail to capture nonlinear brain dynamics.

Purpose of the Study:

  • To develop a reliable method for detecting changes in brain activity using nonlinear signal processing.
  • To investigate the effectiveness of Recurrence Quantification Analysis (RQA) for analyzing brain responses to EMFs.
  • To demonstrate the detection of magnetosensory evoked potentials (MEPs) in individual subjects exposed to EMFs.

Main Methods:

  • Utilized Recurrence Quantification Analysis (RQA), a nonlinear signal-processing technique.
  • Exposed subjects to specific magnetic fields (2G, 30 and 60 Hz).
  • Analyzed electroencephalogram (EEG) data, specifying all analytical conditions in advance.

Main Results:

  • Magnetosensory evoked potentials (MEPs) were consistently detected in all 15 subjects using RQA (P<0.05).
  • MEPs occurred within the predicted latency interval (109-504 ms) and were independent of field frequency and direction.
  • Traditional linear analysis (time averaging) failed to detect these MEPs, even when averaging across subjects.

Conclusions:

  • Recurrence Quantification Analysis (RQA) provides a reliable method for detecting EMF-induced brain activity changes, such as MEPs.
  • Linear analysis methods can obscure real nonlinear phenomena by averaging them out.
  • Nonlinear analysis techniques hold promise for resolving inconsistencies in various brain studies.