Nerve06/central nervous system/classification of the electroencephalogramのソースを表示

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　The frequency of the electroencephalogram (EEG) during sleep is low, and that during calculation is high.  Thus the pattern of EEG, and in particular the frequency, is a subjective measure of the consciousness level.<br>  
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Naturally, sleep frequency is not constant, rather it is periodically higher and lower according to the different sleep stages.

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//LEVEL:3
//NO-RAND
Delta wave is seen during {=deep sleep~light sleep~rest, eyes-closed and awake~psycho-activity such as calculation}.  





//LEVEL:3
//NO-RAND
Theta wave is seen during  {~deep sleep~=light sleep~rest, eyes-closed and awake~psycho-activity such as calculation}.





//LEVEL:2
//NO-RAND
Alpha wave is seen during  {~deep sleep~light sleep~=rest, eyes-closed and awake~psycho-activity such as calculation}.





//LEVEL:3
//RAND
Alpha wave is seen during  {~eyes-opened~=eyes-closed}.





//LEVEL:3
//NO-RAND
Beta wave is seen during  {~deep sleep~light sleep~rest, eyes-closed and awake~=psycho-activity such as calculation}.






//LEVEL:4
//NO-RAND
The {=delta~theta~alpha~beta} wave is seen during deep sleep. 





//LEVEL:4
//NO-RAND
The {~delta~=theta~alpha~beta} wave is seen during light sleep. 






//LEVEL:4
//NO-RAND
The {~delta~theta~=alpha~beta} wave is seen during rest, eyes-closed and awake.






//LEVEL:4
//NO-RAND

The {~delta~theta~alpha~=beta} wave is seen during psycho-activity eg calculation.








//LEVEL:4
//NO-RAND
The frequency of the delta wave is about {=0.5-3~4-7~8-13~13-18} Hz.





//LEVEL:4
//NO-RAND
The frequency of the theta wave is about {~0.5-3~=4-7~8-13~13-18} Hz.







//LEVEL:4
//NO-RAND
The frequency of the alpha wave is about {~0.5-3~4-7~=8-13~13-18} Hz.





//LEVEL:4
//NO-RAND
The frequency of the beta wave is about {~0.5-3~4-7~8-13~=13-18} Hz.





//LEVEL:4
//NO-RAND
The frequency of the {=delta~theta~alpha~beta} wave is about 0.5-3 Hz.





//LEVEL:4
//NO-RAND
The frequency of the {~delta~=theta~alpha~beta} wave is about 4-7 Hz.





//LEVEL:4
//NO-RAND

The frequency of the {~delta~theta~=alpha~beta} wave is about 8-13 Hz.







//LEVEL:4
//NO-RAND
The frequency of the {~delta~theta~alpha~=beta} wave is about 13-18Hz.


</GIFT>