Magnetoencephalography
MEG
Magnetoencephalography

Magnetoencephalography (MEG) is a functional neuroimaging technique for mapping brain activity by recording magnetic fields produced by electrical currents occurring naturally in the brain, using very sensitive magnetometers.

Instrument

  • Basic technology developed in the 1980’s at the Low Temperature Laboratory of the Helsinki University of Technology (at present, Aalto University ).
  • SQUIDS developed and manufactured by the VTT Technical Research Centre of Finland Ltd.
  • Developed and built by MEGIN Oy
  • 102 three-channel units (1 magnetometer and 2 gradiometers in each)
  • 16.5-mm baselength (gradiometers)
  • Narrow sensitivity pattern
  • Excellent balance and calibration
  • Signal maximum right above a source (gradiometers)
  • High signal-to-noise ratio

Fields of MEG research at BioMag

  • Auditory, somatosensory and visual evoked fields
  • Spontaneous activity (coherence, desynchronization)
  • Auditory sensory memory
  • Language studies
  • Presurgical localization of eloquent cortex and epileptic foci
  • Psychopharmacological studies
  • Alzheimer’s disease
  • Psychiatric disorders
  • Recovery from stroke
  • Combination of MEG and fMRI
  • Study of the effect of anisotropy on MEG & EEG inverse problem and on TMS
  • Developmental studies