Continuity of Event-Related Desynchronization Over the Time in Contralateral Hemisphere During Imagination of Right-Hand Movement

Fatemeh Khatami1, Abbas Erfanian

  • 1University of California San Francisco

Details

16:30 - 18:30 | Thu 21 Mar | Grand Ballroom B | ThPO.76

Session: Poster Session I

Abstract

Imagination of limb movements causes increase or decrease in the power of brain activity in different regions of motor cortex. Electroencephalogram (EEG) collected during imagination of limb movement is used as an input for Brain computer interface (BCI) systems to translate the imagination into a command. We have studied the effect of continues hand movement imagination on the event related potentials in the brain. The goal of this paper is to investigate whether continues imagination of hand movement can cause continues effect in the event related potential. For this purpose, a set of experiments were designed and performed to collect 180 trials of hand movement imagination for 3 subjects. We utilized independent component analysis (ICA) to separate the sources related to continues hand movement imagination. The statistical methods including Ansaribradley and analysis of variance (ANOVA) are used to select the components/sources with maximum correlation to the hand movement imagination task. It is shown that although power in both alpha and beta bands decrease by movement imagination, alpha band can differentiate continues imagination vs. non-imagination better than beta band. Besides that, we have found an improvement in the event related synchronization and desynchronization over different sessions for all subjects, which shows effect of training on improving the imagination of the task.