magnetoencephalography
Also written as: MEG — magnetoencephalography
Non-invasive technique measuring magnetic fields produced by electrical brain activity.
Full Definition
Magnetoencephalography (MEG) is a non-invasive neurophysiological imaging technique that measures the magnetic fields generated by electrical currents in neurons, primarily from intracellular currents in dendrites of cortical pyramidal cells. MEG provides excellent temporal resolution (milliseconds) and better spatial resolution than EEG, as magnetic fields are less distorted by the skull and scalp tissues. The technique requires specialized superconducting quantum interference devices (SQUIDs) operated in magnetically shielded rooms. MEG is used in both research and clinical settings to study brain function, localize epileptic foci, and map functional brain areas before neurosurgery. It is particularly valuable for studying the timing and dynamics of neural processes.
Usage
Usage note: Often abbreviated as MEG; requires specialized equipment and facilities.
In Context
- "MEG source localization identified the seizure onset zone in the temporal lobe." — Presurgical epilepsy evaluation
- "The study used magnetoencephalography to track the millisecond dynamics of visual processing." — Cognitive neuroscience research