Visualization of significant ERD/ERS patterns in multichannel EEG and ECoG data

Clin Neurophysiol. 2002 Jan;113(1):43-7. doi: 10.1016/s1388-2457(01)00697-6.


Objectives: Analysis of event-related desynchronization (ERD) and event-related synchronization (ERS) often requires the investigation of diverse frequency bands. Such analysis can be difficult, especially when using multichannel data. Therefore, an effective method for the visualization of event-related changes in oscillatory brain activity is required.

Methods: A bootstrap-based method is presented which gives time-frequency maps showing only significant changes of ERD or ERS in predetermined frequency bands.

Results: Examples from an electroencephalographic study and an electrocorticographic study are shown. The results demonstrate how easily reactive channels and their spatio-temporal and frequency-specific characteristics can be identified by means of this method.

Conclusions: The proposed method is a simple but effective way to visualize significant ERD/ERS patterns.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Algorithms
  • Brain Mapping / methods*
  • Cortical Synchronization / methods*
  • Data Display
  • Data Interpretation, Statistical
  • Electroencephalography / methods*
  • Evoked Potentials / physiology
  • Humans