Title :
Time frequency analysis and spatial filtering in the evaluation of beta ERS after finger movement
Author :
Bianchi, A.M. ; Foffani, G. ; Cerutti, S. ; Babiloni, C. ; Rossini, P.M. ; Carducci, F. ; Babiloni, F. ; Cincotti, F.
Author_Institution :
Dipt. di Bioingegneria, Politecnico di Milano, Milan, Italy
Abstract :
Different methods are compared for the evaluation of the event related synchronization (ERS) in the beta rhythm corresponding to finger movements. In addition to the standard procedure usually employed, the realistic Surface Laplacian (SL) is here introduced to improve the spatial localization of the phenomenon, while a Wavelet Packet (WP) decomposition approach is intended to better detect the time dependent characteristics. The parameters of interest (ERS amplitude and latency) were statistically analyzed through Analysis of Variance (ANOVA) and Scheffe´s test. The WP filtering results are well comparable with the traditional filtering procedure. On the other hand, the realistic SL considerably improves the spatial localization and the consistency of the estimation (decreased variance) of the ERS amplitude
Keywords :
Laplace transforms; biomechanics; electroencephalography; medical signal processing; spatial filters; statistical analysis; time-frequency analysis; wavelet transforms; EEG analysis; Scheffe´s test; analysis of variance; beta ERS evaluation; finger movement; spatial filtering; spatial localization improvement; time dependent characteristics; time dependent characteristics detection; wavelet packet decomposition approach; Analysis of variance; Delay; Filtering; Fingers; Frequency synchronization; Laplace equations; Rhythm; Surface waves; Time frequency analysis; Wavelet packets;
Conference_Titel :
Engineering in Medicine and Biology Society, 2001. Proceedings of the 23rd Annual International Conference of the IEEE
Conference_Location :
Istanbul
Print_ISBN :
0-7803-7211-5
DOI :
10.1109/IEMBS.2001.1019120
