Linear correlation between fractal dimension of EEG signal and handgrip force

Authors:
J. Z. Liu;Q. Yang;B. Yao;R. W. Brown;G. H. Yue
Affiliations:
Dept. of Biomed. Eng., The Lerner Res. Inst., The Cleveland Clinic Foundation. and Dept. of Physics, Case Western Res. Univ., 9500 Euclid Avenue, 44106, Cleveland, OH, USA;Dept. of Biomed. Eng., The Lerner Res. Inst., The Cleveland Clinic Fdn. and Prog. of Appl. Biomed. Eng., Dept. of Chem. Eng., Fenn Col. of Eng., Cleveland Ste. Univ., Cleveland, Ohio, USA;Department of Biomedical Engineering, The Lerner Research Institute, The Cleveland Clinic Foundation and Dept. of Physics, Case Western Res. Univ., 9500 Euclid Avenue, 44106, Cleveland, OH, USA;Department of Physics, Case Western Reserve University, 9500 Euclid Avenue, 44106, Cleveland, OH, USA;Dept. of Biomed. Eng., The Lerner Res. Inst., The Cleveland Clinic Fdn., 9500 Euclid Avenue, 44195, Cleveland, OH, USA and Dept. of Biomed. Eng., Case Western Res. Univ., 9500 Euclid Avenue, 44106 ...
Venue:
Biological Cybernetics
Year:
2005

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Abstract

Fractal dimension (FD) has been proved useful in quantifying the complexity of dynamical signals in biology and medicine. In this study, we measured FDs of human electroencephalographic (EEG) signals at different levels of handgrip forces. EEG signals were recorded from five major motor-related cortical areas in eight normal healthy subjects. FDs were calculated using three different methods. The three physiological periods of handgrip (command preparation, movement and holding periods) were analyzed and compared. The results showed that FDs of the EEG signals during the movement and holding periods increased linearly with handgrip force, whereas FD during the preparation period had no correlation with force. The results also demonstrated that one method (Katz’s) gave greater changes in FD, and thus, had more power in capturing the dynamic changes in the signal. The linear increase of FD, together with results from other EEG and neuroimaging studies, suggest that under normal conditions the brain recruits motor neurons at a linear progress when increasing the force.