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      Improvement of spatial selectivity and decrease of mutual information of tri-polar concentric ring electrodes.

      1 ,

      Journal of neuroscience methods

      Elsevier BV

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          Abstract

          Electroencephalography (EEG) signals are spatio-temporal in nature. EEG has very good temporal resolution but typically does not possess high spatial resolution. The surface Laplacian enhances the spatial resolution and selectivity of the surface electrical activity recording. Concentric ring electrodes have been shown to estimate the surface Laplacian directly with significantly better spatial resolution than conventional electrodes. For this report movement-related potentials (MRP) signals were analyzed. The signals were recorded using tri-polar ring electrodes in the original configuration as well as in bipolar and unipolar configurations achieved by excluding or shorting recording surfaces of the tri-polar version, respectively. The electrodes were placed in an array scheme of 35, encompassing the area between Fz-Cz-Pz-P3-T5-T3-F7-F3 centered on C3. Data were measured in five steps sequentially using only seven electrodes at a time, displaced after each step and aligned during evaluation later. Subjects were cued to press a micro-switch. The signal-to-noise ratio (SNR), spatial selectivity, and mutual information (MI) of the MRP signals recorded with the different electrode systems were compared. The MRP signals recorded with the tri-polar concentric ring electrode system have significantly higher SNR than from bipolar concentric ring electrode and conventional disc electrode emulations. The tri-polar electrodes have also shown significantly higher spatial selectivity as well as significantly less mutual information between locations than the other two electrode configurations tested. These characteristics should make tri-polar concentric electrodes beneficial for EEG applications.

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          Author and article information

          Journal
          J. Neurosci. Methods
          Journal of neuroscience methods
          Elsevier BV
          0165-0270
          0165-0270
          Sep 30 2007
          : 165
          : 2
          Affiliations
          [1 ] Department of Physiology and Biophysics, University of Colorado at Denver Health Sciences Center, Denver, CO, USA. kanthaiah.koka@uchsc.edu
          Article
          S0165-0270(07)00275-0
          10.1016/j.jneumeth.2007.06.007
          17681379

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