Two generalized algorithms measuring phase-amplitude cross-frequency coupling in neuronal oscillations network.
An increasing number of studies pays attention to cross-frequency coupling in neuronal oscillations network, as it is considered to play an important role in exchanging and integrating of information. In this study, two generalized algorithms, phase-amplitude coupling-evolution map approach and phase-amplitude coupling-conditional mutual information which have been developed and applied originally in an identical rhythm, are generalized to measure cross-frequency coupling. The effectiveness of quantitatively distinguishing the changes of coupling strength from the measurement of phase-amplitude coupling (PAC) is demonstrated based on simulation data. The data suggest that the generalized algorithms are able to effectively evaluate the strength of PAC, which are consistent with those traditional approaches, such as PAC-PLV and PAC-MI. Experimental data, which are local field potentials obtained from anaesthetized SD rats, have also been analyzed by these two generalized approaches. The data show that the theta-low gamma PAC in the hippocampal CA3-CA1 network is significantly decreased in the glioma group compared to that in the control group. The results, obtained from either simulation data or real experimental signals, are consistent with that of those traditional approaches PAC-MI and PAC-PLV. It may be considered as a proper indicator for the cross frequency coupling in sub-network, such as the hippocampal CA3 and CA1.
College of Life Sciences and Key Laboratory of Bioactive Materials Ministry of Education, Nankai University, Tianjin, 300071 People's Republic of China.|College of Mathematics, Nankai University, Tianjin, 300071 People's Republic of China.
Qun
Q
Li
College of Life Sciences and Key Laboratory of Bioactive Materials Ministry of Education, Nankai University, Tianjin, 300071 People's Republic of China.|Center for Learning and Memory, The University of Texas at Austin, Austin, TX USA.
Chen-Guang
CG
Zheng
College of Life Sciences and Key Laboratory of Bioactive Materials Ministry of Education, Nankai University, Tianjin, 300071 People's Republic of China.
Ning
N
Cheng
College of Life Sciences and Key Laboratory of Bioactive Materials Ministry of Education, Nankai University, Tianjin, 300071 People's Republic of China.
Yi-Yi
YY
Wang
Institute of Biomedical Engineering, Chinese Academy of Medical Sciences and Peking Union Medical College, Tianjin, 300192 People's Republic of China.
Tao
T
Yin
College of Life Sciences and Key Laboratory of Bioactive Materials Ministry of Education, Nankai University, Tianjin, 300071 People's Republic of China.
Tao
T
Zhang
Local field potentials (LFPs); Neuronal oscillations; Phase–amplitude coupling (PAC); Phase–amplitude coupling-conditional mutual information (PAC-CMI); Phase–amplitude coupling-evolution map approach (PAC-EMA)