Importance of baseline in Event-Related Desynchronization during imaging-observation


Tangwiriyasakul, C. and Verhagen, R. and Rutten, W.L.C. and Putten, M.J.A.M van (2011) Importance of baseline in Event-Related Desynchronization during imaging-observation. Clinical Neurophysiology, 122 (Suppl. 1). S66. ISSN 1388-2457

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Abstract:Introduction: To design a neurofeedback system (NF system) for clinical purposes (e.g. stroke rehabilitation) using imaging-observation of motor movements. Event-Related Desynchronization (ERD) of the mu rhythm (8-13 Hz) is vital to indicate the engagement between the patient’s brain and the NF system. One factor, which influences mu-ERD, is the mu-power during baseline conditions. A baseline movie is defined as a given visual input which can induce or maximize mu-power. Objective: To investigate the effects of various baseline movies on mu-ERD during imaging- observation. Methods: 10 healthy subjects performed the imaging-observation tasks while electroencephalograms (EEGs) were recorded using 60 channels. In each trial, 5 different baseline movies were shown: i) a bouncing ball (BL), ii) a slowly moving flower (FL), iii) a static right hand (SH), iv) two randomly moving balls (2B) and v) a black screen with white stripes (BW). A right hand grasping movie was shown after every baseline. C3 channel was selected for further statistical analysis due to its direct relation with imaging right hand grasping. ANOVA (α=0.05) was performed to test mu-power differences among baselines. Finally, the topographical mu-ERDs were plotted and visually inspected. Results: At the group level, ANOVA of baseline mu-powers revealed no common baseline movie which maximized mu-power. According to the ERD plots, there was no significant difference in the ERD between the five baseline movies. At the individual level, each subject showed relatively high mu-power only in some particular baselines. Thus, the ERD for each subject was dependent on the baseline used. Conclusion: Choice of baseline movie affects ERD during imaging-observation, with significant inter-individual differences.
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Copyright:© 2011 Elsevier
Electrical Engineering, Mathematics and Computer Science (EEMCS)
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