第3课脑电测量及仪器（The third lesson is EEG measurement and instrument）.docVIP

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第3课脑电测量及仪器（The third lesson is EEG measurement and instrument）.doc

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第3课脑电测量及仪器（The third lesson is EEG measurement and instrument）

第3课脑电测量及仪器（The third lesson is EEG measurement and instrument） Bioelectricity measurement and instrument -- EEG measurement and instrument Louis Liu Qianliu@ School of life science and technology, Huazhong University of Science and Technology BIoMedical, Measurements, and, Instrumentation (BMI) Reference books and resources Biomedical measurement and instrumentation, Wang Baohua, Fudan University press, 2003 OpenEEGproject, /OpenECG, content EEG production and EEG Electroencephalograph EEG signal analysis Evoked EEG Generation of brain electricity The transmembrane resting potential of nerve cells is -70mV, which is resting state. After stimulation, the membrane potential increases, and depolarization begins to form action potential. Because the tissue is thick, individual neurons have very little electrical activity and cannot be recorded on the scalp. What can be measured on the scalp is the simultaneous summation of the postsynaptic potentials of a large number of nerve tissues Brain waves are formed by electrical activity synchronized by the numerous neurons in the cerebral cortex. Synchronization is usually thought to be controlled by the brain stem Measurement of brain electricity Spontaneous brain activity: changes in rhythmic potential produced by the cerebral cortex in the absence of obvious sensory stimuli. (10~100uV, 50Hz) Evoked brain potential: changes in brain potential evoked by external stimuli (0~100uV) EEG: spontaneous EEG activity recorded by recording electrodes on the scalp surface. Cortical electrogram: spontaneous brain electrical activity recorded by recording electrodes on the surface of the cortex during craniotomy. electroencephalogram Neurons in the cerebral cortex have spontaneous bioelectric activity, so the cerebral cortex often has a constant rhythmic potential change. Bipolar or unipolar recording is used to observe the changes in the cerebral cortex potential on the scalp, whereas the recorded EEG is called electroencephalogram (EE