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Related Experiment Videos

MEG localization of language-specific cortex utilizing MR-FOCUSS.

S M Bowyer1, J E Moran, K M Mason

  • 1Department of Neurology, Henry Ford Health System, Neuromagnetism Lab, Detroit, MI 48202, USA. drsusan@umich.edu

Neurology
|June 24, 2004
PubMed
Summary

Magnetoencephalography (MEG) with multiresolution FOCUSS (MR-FOCUSS) noninvasively maps language areas in the brain. This technique precisely images neuronal activity during language tasks with millisecond resolution.

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Area of Science:

  • Neuroscience
  • Cognitive Science
  • Biophysics

Background:

  • Accurate localization of language-critical cortical areas is essential for understanding brain function.
  • Noninvasive neuroimaging techniques are crucial for studying cognitive processes like language.

Purpose of the Study:

  • To demonstrate the noninvasive localization of cognitive cortical areas involved in language processing.
  • To utilize magnetoencephalography (MEG) interpreted by multiresolution FOCUSS (MR-FOCUSS) for current density imaging.

Main Methods:

  • MEG data were collected during verb-generation and picture-naming tasks.
  • Participants included 18 right-handed control subjects and 24 right-handed patients with epilepsy.
  • Data were analyzed using the MR-FOCUSS current density imaging technique.

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Main Results:

  • Verb-generation task analysis showed activation in the left supramarginal, superior temporal, and angular gyri at 239 ± 31 ms.
  • Picture-naming task analysis revealed activation in the left inferior frontal gyrus (IFG) area starting at 436 ± 40 ms.
  • Average amplitudes of underlying cortical sources were approximately 452 pAm for verb generation and 380 pAm for picture naming.

Conclusions:

  • The time course of neuronal language processing can be imaged noninvasively.
  • Magnetoencephalography (MEG) combined with the multiresolution FOCUSS (MR-FOCUSS) technique provides millisecond resolution for imaging language processing.