EEG Rhythms - Event-Related Desynchronization and Synchronization

  • G. Pfurtscheller
Part of the Springer Series in Synergetics book series (SSSYN, volume 55)


Event-related desynchronization (ERD) designates a short-lasting and localized amplitude attenuation of rhythms within the alpha band; event-related synchronization (ERS) describes a short-lasting amplitude enhancement. The topographical pattern of the ERD may reflect activation or excitation of cortical areas. Localized patterns or ERS probably represent inhibition of cortical areas. During a visualtask, ERD is found over occipital areas and ERS over central areas close to the electrodes C3 and C4Intrinsic rhythms within the alpha band can therefore be used to study excitation and inhibition or idling of cortical areas.


Visual Feedback Sensorimotor Cortex Finger Movement Alpha Band Imperative Stimulus 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


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Copyright information

© Springer-Verlag Berlin Heidelberg 1991

Authors and Affiliations

  • G. Pfurtscheller
    • 1
  1. 1.Department of Medical Informatics, Institute of Biomedical EngineeringGraz University of Technology, and Ludwig Boltzmann Institute for Medical InformaticsGrazAustria

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