Abstract
With the rapid growth of technology, interest in exploring the human brain is increasing. In view of the high cost of existing measurement methods, this study attempted to develop a low-cost high-accuracy brain activate-energy (AE) monitoring system by combining the advantages of electroencephalography (EEG) and near-infrared spectroscopy (NIRS). This AE monitoring system included EEG and NIRS data processing blocks and light sources for NIRS measurement. The collected NIRS signals of red and infrared light indicate the relative concentrations of oxy-hemoglobin (HbO2) and deoxy-hemoglobin (Hb), respectively. Besides that, the electric performance parameters of the EEG and NIRS measurement system, such as the circuit readout noise, electromagnetic interference, and power rejection ratio, are improved. To construct a small measurement module for wearable applications, surface mount devices and multilayer printed circuit board layout technology were used. The board, which included an EEG channel and an NIRS channel, was 2.8 cm in width and 4 cm in length. Simple experiments were conducted to verify the correlation between the NIRS data and the EEG data. Coherence analyses results showed that the blood oxygen concentration was correlated with the EEG signal, especially for 0.2 to 0.4 Hz. The results reinforced our belief that the proposed system can provide useful information for efficiently evaluating a subject's brain electric energy variations.
Published Version
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