High Resolution ERD

  • Pfurtscheller, Gert (Teilnehmer (Co-Investigator))
  • Edlinger, Guenter, (Teilnehmer (Co-Investigator))
  • Neuper, Christa, (Teilnehmer (Co-Investigator))
  • Schweitzer, Gunther, (Teilnehmer (Co-Investigator))

    Projekt: Foschungsprojekt



    The objective of the research is to combine spatially enhanced event-related desynchronization (ERD) data recorded during motor experiments to the anatomy of the brain. The EEG measured on the scalp of the human head represents the bioelectric activity of different brain areas. Due to the spatial (low-pass) filtering effect of the volume conductor between the source regions and the measurement points on the surface of the head, the EEG is blurred and distorted in comparison to e.g. a cortical derivation of the bioelectric activity.

    Four methods, the local average reference method (LAR), the surface Laplacian method (LP), the linear estimation method (LE) and the so called cortical imaging method (CI) are applied to the event-related data to realize a so called "High resolution ERD". Realistic head models in combination with the Finite Element Method (FEM) and Boundary Element (BEM) method are used for the computation of the deblurred ERD. The geometric models of the individual human heads are constructed based on magnetic resonance images (MRI). An important part of the EEG research is the experimental verification of the results. The High-Resolution ERD results are compared with other functional imaging methods such as functional MR imaging. A future project will comprise a comparison of the computed results with potential measurements with implanted electrodes.
    Tatsächlicher Beginn/ -es Ende1/10/9731/10/01