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Investigation of the presence of movement intention during sequential hand movements using neurophysiological analyses of EEG signals

Authors :

Elnaz Eilbeigi¹

1- هیات علمی دانشگاه آزاد اسلامی تهران شرق

Keywords :

brain computer interface (BCI)،movement related cortical potentials (MRCP)،event related desynchronization (ERD)،inter trial coherence (ITC)،movement،intention،rehabilitation

Abstract :

A brain–computer interface (BCI) is considered a promising tool in neurorehabilitation. For this purpose, movement intention can be detected from brain signals and used as a control command for a robotic device. In most existing studies, a rest interval is provided before each movement to allow the generation of movement intention. However, daily life activities are performed continuously, without such intervals. This paper focuses on detecting movement intention during sequential movements, using neurophysiological analyses that include movement-related cortical potentials (MRCP), event-related desynchronization/synchronization (ERD/ERS) patterns, and, for the first time, inter-trial phase coherence (ITC) analysis. The results showed that during sequential hand movements, including reaching, grasping and lifting objects of various weights, holding the object, lowering it, replacing it, releasing it, and returning the hand to its initial position, two movement intentions were present: the first before starting the hand movement, and the second during the holding phase of the object. Therefore, in this study, we demonstrated that it is possible to decode the next movement intention while performing the current movement, which can lead to the development of a new generation of intelligent neural prostheses.