Title :
A method for the discrimination between induced and evoked gamma band activity
Abstract :
A method for single EEG sweep analysis is presented. It is based on signal envelope calculations by means of the Hilbert transform, and it allows the discrimination between evoked (phase-locked) and induced (non-phase-locked) event-related synchronisation/desynchronisation (ERS/ERD) responses at a given frequency band. We tested our analytical method on EEG data collected from subjects under median nerve stimulation. We selected for our analysis the gamma-band range (30 to 80 Hz). No induced ERS was found in this frequency band, but the presence of evoked activity strongly phase-locked to the stimulus was evident
Keywords :
Hilbert transforms; bioelectric potentials; electroencephalography; medical signal processing; synchronisation; 30 to 80 Hz; Hilbert transform; event-related desynchronisation responses; event-related synchronisation responses; evoked gamma-band activity; induced gamma-band activity; median nerve stimulation; nonphase-locked responses; phase-locked responses; signal envelope calculations; single EEG sweep analysis;
Conference_Titel :
Advances in Medical Signal and Information Processing, 2000. First International Conference on (IEE Conf. Publ. No. 476)
Conference_Location :
Bristol
Print_ISBN :
0-85296-728-4
DOI :
10.1049/cp:20000342
