Functional brain imaging based on ERD/ERS

Vision Res. 2001;41(10-11):1257-60. doi: 10.1016/s0042-6989(00)00235-2.


Sensory, cognitive and motor processing can result in changes of the ongoing EEG in form of an event-related desynchronization (ERD) or event-related synchronization (ERS). Both phenomena are time-locked but not phase-locked to the event and they are highly frequency-band specific. The ERD is interpreted as a correlate of an activated cortical area with increased excitability and the ERS in the alpha and lower beta bands can be interpreted, at least under certain circumstances, as a correlate of a deactivated cortical area. Spatial mapping of ERD/ERS can be used to study the dynamics of cortical activation patterns. Examples from a movement task are reported.

MeSH terms

  • Alpha Rhythm
  • Electroencephalography
  • Electrophysiology
  • Evoked Potentials, Motor*
  • Humans
  • Motor Cortex / physiology