AI Article Synopsis
- The study investigates how different baseline conditions affect the mu-rhythm in the brain during motor imagery tasks.
- It involved 18 healthy participants who performed tasks while their EEG was recorded, using five distinct baseline videos.
- Results showed that about 50% of participants had high mu-power with specific baselines, while 67% displayed a contralateral ERD, highlighting the importance of baseline selection for accurately measuring brain activity.
Article Abstract
Objective: Event-related desynchronization (ERD) or synchronization (ERS) refers to the modulation of any EEG rhythm in response to a particular event. It is typically quantified as the ratio between a baseline and a task condition (the event). Here, we focused on the sensorimotor mu-rhythm. We explored the effects of different baselines on mu-power and ERD of the mu-rhythm during a motor imagery task.
Methods: Eighteen healthy subjects performed motor imagery tasks while EEGs were recorded. Five different baseline movies were shown. For the imagery task a right-hand opening/closing movie was shown. Power and ERD of the mu-rhythm recorded over C3 and C4 for the different baselines were estimated.
Main Results: 50% of the subjects showed relatively high mu-power for specific baselines only, and ERDs of these subjects were strongly dependent on the baseline used. In 17% of the subjects no preference was found. Contralateral ERD of the mu-rhythm was found in about 67% of the healthy volunteers, with a significant baseline preference in about 75% of that subgroup.
Significance: The sensorimotor ERD quantifies activity of the brain during motor imagery tasks. Selection of the optimal baseline increases ERD.
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| http://dx.doi.org/10.1088/1741-2560/10/2/026009 | DOI Listing |
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