TY - JOUR T1 - Discussion on "Towards a quantitative characterization of functional states of the brain: from the non-linear methodology to the global linear description" by J. Wackermann. JF - Int J Psychophysiol Y1 - 2005 A1 - Pei, Xiao-Mei A1 - Zheng, Shi Dong A1 - Zhang, Ai-hua A1 - Duan, Fu-jian A1 - Bin, Guang-yu KW - Algorithms KW - Brain KW - Diagnostic Imaging KW - Functional Laterality KW - Humans KW - Linear Models KW - Models, Neurological KW - Nonlinear Dynamics AB -

Wackermann (1999) [Wackermann, J., 1999. Towards a quantitative characterization of functional states of the brain: from the non-linear methodology to the global linear description. Int. J. Psychophysiol. 34, 65-80] proposed Sigma-phi-Omega system for describing the global brain macro-state, in which Omega complexity was used to quantify the degree of synchrony between spatially distributed EEG processes. In this paper the effect of signal power on Omega complexity is discussed, which was not considered in Wackermann's paper (1999). Then an improved method for eliminating the effect of signal power on Omega complexity is proposed. Finally a case study on the degree of synchrony between two-channel EEG signals over different brain regions during hand motor imagery is given. The results show that the improved Omega complexity measure would characterize the true degree of synchrony among the EEG signals by eliminating the influence of signal power.

VL - 56 UR - http://www.ncbi.nlm.nih.gov/pubmed/15866324 IS - 3 ER -