Electroencephalographic modulations during an open- or closed-eyes motor task.
There is fundamental knowledge that during the resting state cerebral activity recorded by electroencephalography (EEG) is strongly modulated by the eyes-closed condition compared to the eyes-open condition, especially in the occipital lobe. However, little research has demonstrated the influence of the eyes-closed condition on the motor cortex, particularly during a self-paced movement. This prompted the question: How does the motor cortex activity change between the eyes-closed and eyes-open conditions? To answer this question, we recorded EEG signals from 15 voluntary healthy subjects who performed a simple motor task (i.e., a voluntary isometric flexion of the right-hand index) under two conditions: eyes-closed and eyes-open. Our results confirmed strong modulation in the mu rhythm (7-13 Hz) with a large event-related desynchronisation. However, no significant differences have been observed in the beta band (15-30 Hz). Furthermore, evidence suggests that the eyes-closed condition influences the behaviour of subjects. This study gives us greater insight into the motor cortex and could also be useful in the brain-computer interface (BCI) domain.
['Rimbert|Sébastien|S|', 'Al-Chwa|Rahaf|R|', 'Zaepffel|Manuel|M|', 'Bougrain|Laurent|L|']
Electroencephalography Eyes-closed Eyes-open Motor cortex Event-related desynchronization (ERD) Event-relatedsynchronization (ERS) Real movement Voluntary movement