实验 人体脑电图的描记（The recording of electroencephalogram in experimental human body）.docVIP

实验 人体脑电图的描记（The recording of electroencephalogram in experimental human body） [Objective] 1. Study the recording method of human electroencephalogram. 2. Understand the normal EEG waveform. 3. Observe the influence of different thinking activities on eeg. [fundamentals] The electrical activity of the human brain, guided by the scalp electrode, enlarged and displayed or recorded, is called an electroencephalogram (EEG). EEG is mainly composed of rhythmic electrical activities. The brain waves are classified according to frequency (week /s or Hz): Alpha wave: frequency 8~13Hz, amplitude is 10~100 mu V, which is the normal wave shape of adults in quiet closed eyes. The alpha activity is the most obvious in the top and occipital areas, the largest number and the highest amplitude. Beta: the frequency of 14~30Hz, amplitude of 5~25 V in frontal and temporal and central beta activities is the most obvious; the index of about 25%. Theta: the frequency of 4~7Hz, amplitude of 20~100 V, said the brain is deep thinking or inspiration thinking, is the basic waveform of preschool children, adults will also appear in the sleepy state. Delta wave: the frequency is 0.5~3Hz, the amplitude is 20~200 mu V, which means that the brain is in dreamless sleep state. It is the basic waveform of the baby brain. It can also be seen in the physiological slow wave sleep state and the pathological coma state. The individual difference of frequency is very small, and the individual difference of amplitude is larger. There are many factors that affect brain waves. There is a close relationship between the normal EEG and age, the age is small, fast and less, and more slow wave, and is associated with baseline instability; the older, the more is fast, and slow wave less. However, after 50 years of age, the slow wave continues to rise and is accompanied by a slow wave with varying degrees of basic frequency. Brain waves are more affected by mental activities such as conscious activity, emotional expre