Investigating spatial specificity and data averaging in MEG

  title={Investigating spatial specificity and data averaging in MEG},
  author={Matthew J. Brookes and Johanna M. Zumer and Claire M. Stevenson and Joanne R. Hale and Gareth R. Barnes and Jiri Vrba and Peter G. Morris},
This study shows that the spatial specificity of MEG beamformer estimates of electrical activity can be affected significantly by the way in which covariance estimates are calculated. We define spatial specificity as the ability to extract independent timecourse estimates of electrical brain activity from two separate brain locations in close proximity. Previous analytical and simulated results have shown that beamformer estimates are affected by narrowing the time frequency window in which… CONTINUE READING


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