engleski

Detection of changes in neural oscillations during movement imagination

Movement execution is accompanied by specific changes in brain activity. Apart from movement related evoked potentials that are phase-locked to a movement onset, movement planning and execution also results in changes in neural oscillations that are not phase-locked to a movement onset. An attenuation/enhancement of amplitude of specific frequency band of neural oscillations is called event related desynchronization (ERD) / event related synchronization (ERS). ERD occurring during movement execution and planning is specific for mu rhythm, while ERS of beta band (beta rebound) is an event emerging after movement execution. Imagined movements show much resemblance concerning brain activity to real movements. This fact is greatly used in brain-computer interface (BCI) implementations. In this study, single trial ERD/ERS detection during imagined movements was studied. Even though a good recognition of movement imagination can be achieved (true positive rate, TPR), occurrence of false positives (FP) represents an important problem. Changes of classification parameters (dwell time and threshold) were investigated in order to provide higher TPR and lower FPR. The study confirms the importance of custom designing of BCI for each user.

brain-computer interface; movement imagination; event related (de)synchronization

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