Stability of event-related (de-) synchronization during brain-computer interface-relevant mental tasks

作者：Friedrich Elisabeth V C^*; Scherer Reinhold; Neuper Christa

来源：Clinical Neurophysiology, 2013, 124(1): 61-69.

DOI：10.1016/j.clinph.2012.05.020

• Event-related desynchronization/synchronization (ERD/S)
• EEG
• Stability
• Consistency
• Reliability
• Brain-computer interface (BCI)
• Mental tasks

Objective: The aim of this study was to examine the temporal stability of event-related desynchronization/ synchronization (ERD/ S) patterns over several sessions as a function of mental task, frequency band, brain region and time interval during the imagery period. %26lt;br%26gt;Methods: Nine volunteers participated in four sessions within 2 weeks of multi-channel EEG recordings. They performed seven mental tasks (i. e. mental rotation, word association, auditory imagery, mental subtraction, spatial navigation, imagery of familiar faces, motor imagery) during 7-s imagery periods. Cronbach%26apos;s alpha coefficients were calculated over sessions to evaluate the stability of ERD/ S values. %26lt;br%26gt;Results: The word association, mental subtraction and spatial navigation task showed highest stability. Cronbach%26apos;s alpha coefficients were highest in the alpha bands (7-10, 10-13 Hz), poorer in the beta bands (13-20, 20-30 Hz) and poorest in the theta band (4-7 Hz). In the majority of tasks, the first time interval and posterior left regions showed highest stability and strongest ERD in the alpha and beta bands. %26lt;br%26gt;Conclusion: Stability of ERD/ S is strongly dependent on the specific task and differs between time intervals of the imagery period. Furthermore, stability was related to ERD in the alpha and beta bands. %26lt;br%26gt;Significance: The reliability of brain activation patterns is highly relevant for brain-computer interface developments.

• 出版日期2013-1