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Related Concept Videos

Magnetism01:30

Magnetism

Magnets are commonly found in everyday objects, such as toys, hangers, elevators, doorbells, and computer devices. Experimentation on these magnets shows that all magnets have two poles: one is labeled north (N) and the other south (S). Magnetic poles repel if they are alike and attract if unlike. Moreover, both poles of a magnet attract unmagnetized pieces of iron.
An individual magnetic pole cannot be isolated. No matter how small, every piece of a magnet contains a north pole and a south...
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Magnetic Fields

A moving charge or a current creates a magnetic field in the surrounding space, in addition to its electric field. The magnetic field exerts a force on any other moving charge or current that is present in the field. Like an electric field, the magnetic field is also a vector field. At any position, the direction of the magnetic field is defined as the direction in which the north pole of a compass needle points.
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Related Experiment Video

Updated: Jul 6, 2026

Mapping the After-effects of Theta Burst Stimulation on the Human Auditory Cortex with Functional Imaging
10:09

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Published on: September 12, 2012

Somatically evoked magnetic fields of the human brain.

D Brenner1, J Lipton, L Kaufman

  • 1Department of Physics, New York University, New York, NY 10003, USA.

Science (New York, N.Y.)
|January 6, 1978
PubMed
Summary

The human brain generates a detectable magnetic field near the scalp in response to finger stimulation. This magnetic response, localized to the sensory cortex, shows a latency of about 70 milliseconds.

Area of Science:

  • Neuroscience
  • Biophysics
  • Biomagnetism

Background:

  • The human brain generates electrical activity.
  • Detecting subtle magnetic fields from the brain is challenging.

Purpose of the Study:

  • To investigate the magnetic field produced by the human brain.
  • To determine the localization and characteristics of this magnetic response.

Main Methods:

  • Applied periodic electrical stimulation to a finger.
  • Used a highly sensitive superconducting quantum interference device (SQUID) to detect magnetic fields.
  • Localized the magnetic field over the sensory cortex.

Main Results:

  • A magnetic field near the scalp was detected, synchronized with finger stimulation.

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  • The magnetic field was sharply localized over the primary sensory cortex contralateral to the stimulated digit.
  • Cortical response latency was approximately 70 milliseconds at intermediate frequencies.

    • Conclusions:

    • The human brain produces a measurable magnetic field synchronous with sensory input.
    • This magnetic field provides a localized indicator of cortical activity.
    • The findings offer insights into human sensory processing and cortical dynamics.