Measurements of the mu/beta ERD and gamma ERS during the imagination of body parts movement

Abstract

In recent years, many studies shows that the ERS (event-related synchronization) in the gamma band is associated with cortical activation during the imagination of body parts movement. It is also known that the ERD (event-related desynchronization) in the micro and beta band are caused by the imagination of body parts movement. In this study, we investigated the relationship between the gamma ERS and micro/beta ERDs. We recorded 64-channel EEG in order to obtain the power map of the gamma component. Furthermore, we compared the characteristics of the gamma waveform and micro/beta waveforms at the locations where the gamma ERS appeared clearly. As a result, we obtained three conclusions. Firstly, gamma ERS caused by the imagination of body parts movement appears at near somatosensory area and motor area. Gamma ERS caused by the imagination of right arm movement appears at the left side of the somatosensory area, that of left arm movement appears at the right side of the somatosensory area, and that of the foot movement appears at the center of the motor area. Secondly, micro/beta ERDs appear simultaneously with the preparation of the imagination, and they continue during the imagination. However, gamma ERS appeared simultaneously with the imagination of body parts movement. Finally, the power of the micro/beta component decrease gradually, but that of the gamma component increases significantly.

Performance analysis of LDA, QDA and KNN algorithms in left-right limb movement classification from EEG data

“…In case of ERS the power of the gamma component increases, while in case of ERD the power of the mu-beta component decreases. [4], [5] The paper is divided into seven sections. The organization of the experimental data is explained in section II.…”

Females with schizophrenia have abnormal functional cortical connectivity in the gamma frequency during an auditory oddball task using magnetoencephalography

“…Gamma ERS during sentence-level language comprehension has previously been linked with semantic unification, and increased gamma power was related to the predictability of an upcoming word based on the preceding sentence context [54]. Gamma ERS was associated with cortical activation while imagining the movement of body parts, and appeared to be located near somatosensory and motor areas [55]. The decreased ERS observed in the present study may be related to dysfunction in imagining the movement of body parts and sentence-level language comprehension in schizophrenia.…”

A bacterial foraging optimization and learning automata based feature selection for motor imagery EEG classification

“…Informative motor imagery signals predominantly appear in the primary, supplementary and pre-motor cortex region of the brain and is recorded from µ (8-12 Hz) and central β (16-24 Hz) band of EEG signals [11]. EEG is acquired with the help of a 14 channel Emotiv headset having a sampling rate of 128Hz.…”

“…Recently, the trend has shifted to wrist and finger movement classification from EEG [9][10]. In [11], researchers claim that the EEG modality during movement imagination or execution is Event Related Desynchronization and Synchronization (ERD/S). Recently, Principal Component Analysis (PCA) [12], Independent Component Analysis (ICA) [13] and Sequential Forward Search (SFS) [14] has been used for feature selection.…”