tailieunhanh - báo cáo hóa học:" Research Article Magnitude Squared of Coherence to Detect Imaginary Movement"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Research Article Magnitude Squared of Coherence to Detect Imaginary Movement | Hindawi Publishing Corporation EURASIP Journal on Advances in Signal Processing Volume 2009 Article ID 534536 12 pages doi 2009 534536 Research Article Magnitude Squared of Coherence to Detect Imaginary Movement Sady Antonio Santos Filho 1 Carlos Julio Tierra-Criollo 1 Ana Paula Souza 1 Marcos Antonio Silva Pinto 1 Maria Luiza Cunha Lima 2 and Gilberto Mastrocola Manzano3 1 Biomedical Engineering Studies and Research Group NEPEB Department of Electrical Engineering Federal University of Minas Gerais UFMG Av. Antonio Carlos 6627 31270-010 Belo Horizonte MG Brazil 2 Department of Arts and Social Sciences Federal University of Minas Gerais UFMG Av. Antonio Carlos 6627 31270-010 Belo Horizonte MG Brazil 3 Department of Neurology Federal University ofSao Paulo UNIFESP Rua Botucatu 603 04023-062 Sao Paulo SP Brazil Correspondence should be addressed to Sady Antonio Santos Filho sasfilho@ Received 1 January 2009 Revised 3 April 2009 Accepted 8 June 2009 Recommended by Karim Oweiss This work investigates the Magnitude Squared of Coherence MSC for detection of Event Related Potentials ERPs related to left-hand index finger movement. Initially ERP presence was examined in different brain areas. To accomplish that 20 EEG channels were used positioned according to the 10-20 international system. The grand average resulting from 10 normal subjects showed as expected responses at frontal central and parietal areas particularly evident at the central area C3 C4 Cz . The MSC applied to movement imagination related EEG signals detected a consistent response in frequencies around Hz delta band mainly at central area C3 Cz and C4 . Ability differences in control imagination among subjects produced different detection performance. Some subjects needed up to 45 events for a detectable response while for some others only 10 events proved sufficient. Some subjects also required two or three experimental sessions in order to achieve detectable responses. .