PMID: 9444843Jan 28, 1998Paper

MEG covariance difference analysis: a method to extract target source activities by using task and control measurements

IEEE Transactions on Bio-medical Engineering
K SekiharaY Miyashita

Abstract

A method is proposed for extracting target dipolesource activities from two sets of evoked magnetoencephalographic (MEG) data, one measured using task stimuli and the other using control stimuli. The difference matrix between the two covariance matrices obtained from these two measurements is calculated, and a procedure similar to the MEG-multiple signal classification (MUSIC) algorithm is applied to this difference matrix to extract the target dipole-source configuration. This configuration corresponds to the source-configuration difference between the two measurements. Computer simulation verified the validity of the proposed method. The method was applied to actual evoked-field data obtained from simulated task-and-control experiments. In these measurements, a combination of auditory and somatosensory stimuli was used as the task stimulus and the somatosensory stimulus alone was used as the control stimulus. The proposed covariance difference analysis successfully extracted the target auditory source and eliminated the disturbance from the somatosensory sources.

References

Jun 1, 1992·IEEE Transactions on Bio-medical Engineering·J C MosherR M Leahy
Jan 1, 1989·Electroencephalography and Clinical Neurophysiology·A S GevinsJ Illes
Sep 1, 1989·The Journal of the Acoustical Society of America·R HariS L Joutsiniemi
Jun 18, 1982·Science·G L RomaniL Kaufman
Jan 1, 1994·Experimental Brain Research·N ForssJ Simola
Jan 1, 1997·Trends in Neurosciences·R Hari, R Salmelin
Oct 1, 1996·NeuroImage·K J FristonR J Dolan

❮ Previous
Next ❯

Citations

Sep 29, 2000·IEEE Transactions on Bio-medical Engineering·J J ErmerR M Leahy

❮ Previous
Next ❯

Related Concepts

Related Feeds

Auditory Perception

Auditory perception is the ability to receive and interpret information attained by the ears. Here is the latest research on factors and underlying mechanisms that influence auditory perception.

Barrel cortex

Here is the latest research on barrel cortex, a region of somatosensory and motor corticies in the brain, which are used by animals that rely on whiskers for world exploration.