Frequency characteristics of biomagnetic signals: verification by MEG measurements

抄録

The frequency characteristics of spontaneous rhythms and evoked steady-state responses resulting from the electrical activity of the cortical neurons and physiological rhythms such as respiration and heartbeat are related by an even frequency ratio. Furthermore, the frequency of the heartbeat is correlated with body mass index (BMI), suggesting that the rhythmic properties of the body, including the brain, may be harmonically and hierarchically organised by a common continuum based on the constraints of biological structure. In this study, we investigate the harmonic structure as a mechanism of biological rhythms using magnetoencephalographic (MEG) signals. MEG detects magnetic field components derived from neuronal activity as well as physiological muscle movements. Simultaneous detection of the biomagnetic signals (and noise) enables a unified verification at the individual level, which may have various applications such as optimization of the audiovisual environment according to the biological characteristics of the individuals.